UNITRODE CORP
DEF 14A, 1999-04-23
SEMICONDUCTORS & RELATED DEVICES
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<PAGE>   1
                            SCHEDULE 14A INFORMATION
 
          PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES
                  EXCHANGE ACT OF 1934 (AMENDMENT NO.       )
 
FILED BY THE REGISTRANT [X]       FILED BY A PARTY OTHER THAN THE REGISTRANT [ ]
 
- --------------------------------------------------------------------------------
 
Check the appropriate box:
[ ] Preliminary Proxy Statement
[X] Definitive Proxy Statement
[ ] Definitive Additional Materials
[ ] Soliciting Material Pursuant to sec.240.14a-11(c) or sec.240.14a-12
[ ] Confidential, for Use of the Commission Only (as permitted by Rule
    14a-6(e)(2))
 
                              UNITRODE CORPORATION
                (Name of Registrant as Specified In Its Charter)

                              UNITRODE CORPORATION
                   (Name of Person(s) Filing Proxy Statement)
 
PAYMENT OF FILING FEE (CHECK THE APPROPRIATE BOX):
[X] No fee required.
[ ] Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.
 
    1) Title of each class of securities to which transaction applies:
 
    2) Aggregate number of securities to which transaction applies:
 
    3) Per unit price or other underlying value of transaction computed pursuant
       to Exchange Act Rule 0-11 (Set forth the amount on which the filing fee
       is calculated and state how it was determined):
 
    4) Proposed maximum aggregate value of transaction:
 
    5) Total fee paid:
 
[ ] Fee paid previously with preliminary materials.
 
[ ] Check box if any part of the fee is offset as provided by Exchange Act Rule
    0-11(a)(2) and identify the filing for which the offsetting fee was paid
    previously. Identify the previous filing by registration statement number,
    or the Form or Schedule and the date of its filing.
 
    1) Amount Previously Paid:
  
    2) Form, Schedule or Registration Statement No.:
 
    3) Filing Party:
 
    4) Date Filed:
 
- --------------------------------------------------------------------------------
<PAGE>   2
 
                          [UNITRODE CORPORATION LOGO]
 
                              UNITRODE CORPORATION
 
                    NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
 
                                  JUNE 7, 1999
 
To The Stockholders:
 
     The Annual Meeting of Stockholders of Unitrode Corporation, a Maryland
corporation (the "Corporation"), will be held on Monday, June 7, 1999 at 11:00
a.m. at the Executive Leadership Center, Boston University School of Management,
595 Commonwealth Avenue, Boston, Massachusetts to consider and vote upon:
 
     1.  The election of one director for a one-year term ending in 2000, the
         election of one director for a two-year term ending in 2001 and the
         election of two directors for a three-year term ending in 2002.
 
     2.  Approval of the Corporation's 1999 Equity Incentive Plan.
 
     3.  Approval of the Corporation's 1999 Employee Stock Purchase Plan.
 
     4.  Such other business as may properly come before the meeting or any
         adjournment or postponement thereof.
 
     The Board of Directors has fixed the close of business on Friday, April 9,
1999 as the Record Date for determining the stockholders entitled to notice of
and to vote at the meeting.
 
     IN ORDER THAT YOUR STOCK MAY BE REPRESENTED AT THE MEETING IN CASE YOU ARE
NOT PERSONALLY PRESENT, PLEASE COMPLETE, SIGN AND DATE THE ENCLOSED PROXY AND
RETURN IT PROMPTLY IN THE ACCOMPANYING ADDRESSED ENVELOPE. NO POSTAGE NEED BE
AFFIXED IF MAILED IN THE UNITED STATES. REGISTERED STOCKHOLDERS MAY ALSO VOTE
THEIR SHARES VIA (1) A TOLL-FREE TELEPHONE CALL FROM THE U.S. AND CANADA, OR (2)
THE INTERNET. THE TELEPHONE AND INTERNET VOTING PROCEDURES ARE DESIGNED TO
AUTHENTICATE STOCKHOLDERS' IDENTITIES, TO ALLOW STOCKHOLDERS TO VOTE THEIR
SHARES AND TO CONFIRM THAT THEIR INSTRUCTIONS HAVE BEEN PROPERLY RECORDED. THE
CORPORATION HAS BEEN ADVISED BY COUNSEL THAT THE PROCEDURES WHICH HAVE BEEN PUT
IN PLACE ARE CONSISTENT WITH THE REQUIREMENTS OF APPLICABLE LAW. SPECIFIC
INSTRUCTIONS TO BE FOLLOWED BY ANY REGISTERED STOCKHOLDER INTERESTED IN VOTING
VIA TELEPHONE OR THE INTERNET ARE SET FORTH ON THE ENCLOSED PROXY CARD.
 
                                            By order of the Board of Directors.
 
                                            ALLAN R. CAMPBELL
                                            Senior Vice President,
                                            General Counsel and Secretary
 
7 Continental Boulevard
Merrimack, New Hampshire 03054
April 27, 1999
<PAGE>   3
 
                              UNITRODE CORPORATION
                            7 CONTINENTAL BOULEVARD
                         MERRIMACK, NEW HAMPSHIRE 03054
 
                                PROXY STATEMENT
 
                         ANNUAL MEETING OF STOCKHOLDERS
                                  JUNE 7, 1999
 
     This Proxy Statement and the enclosed form of proxy are furnished to
stockholders of Unitrode Corporation, a Maryland corporation (the "Corporation"
or "Unitrode"), in connection with the solicitation by the Board of Directors of
proxies to be exercised at the Annual Meeting of Stockholders of the Corporation
to be held Monday, June 7, 1999 at the time and place set forth in the
accompanying Notice of Annual Meeting of Stockholders and at all adjournments or
postponements thereof. Registered stockholders may vote their shares via (1) a
toll-free telephone call from the U.S. and Canada, or (2) the internet or (3) by
mailing their signed proxy card. The telephone and internet voting procedures
are designed to authenticate stockholders' identities, to allow stockholders to
vote their shares and to confirm that their instructions have been properly
recorded. The Corporation has been advised by counsel that the procedures which
have been put in place are consistent with the requirements of applicable law.
Specific instructions to be followed by any registered stockholder interested in
voting via telephone or the internet are set forth on the enclosed proxy card.
Any person giving the enclosed form of proxy or voting by telephone or the
internet has the power to revoke it by voting in person at the Annual Meeting,
by delivery of a later-dated proxy, or by giving written notice to the Secretary
of the Corporation at any time before the proxy is exercised. This Proxy
Statement and the enclosed form of proxy are first being sent to stockholders on
or about April 27, 1999.
 
     The Corporation will bear the cost of solicitation of proxies. In addition
to solicitation by mail, proxies may be solicited by directors, officers and
employees of the Corporation, personally or by telephone, and the Corporation
may reimburse brokerage firms, banks, custodians, nominees and their fiduciaries
for their reasonable out-of-pocket expenses in forwarding proxy materials to
their principals. In addition, the Corporation has retained Georgeson & Co. to
assist in the solicitation of proxies. The fees of Georgeson & Co. are expected
to aggregate approximately $10,000 plus reimbursement for out-of-pocket
expenses.
 
RECORD DATE AND VOTING SECURITIES
 
     Only stockholders of record at the close of business on Friday, April 9,
1999 (the "Record Date") are entitled to vote at the Annual Meeting. On that
date, the Corporation had outstanding 32,152,191 shares of common stock, each of
which is entitled to one vote.
 
VOTES REQUIRED FOR APPROVAL
 
     The presence in person or by proxy of stockholders entitled to cast at
least a majority of the votes entitled to be cast at the Annual Meeting is
necessary to establish a quorum. Abstentions and broker non-votes will be
counted as present or represented for purposes of determining whether a quorum
is present. The election of each director requires the affirmative vote of the
holders of a majority of the votes entitled to be cast at the Annual Meeting.
For purposes of the election of directors, an abstention with respect to any
nominee will have the same effect as a vote against that nominee. The
affirmative vote of a majority of the votes cast on the proposal is required for
approval of the 1999 Equity Incentive Plan, provided that the total vote cast on
the proposal represents over 50 percent in interest of all securities entitled
to vote on the proposal. For purposes of the vote on the Equity Incentive Plan,
an abstention or a broker non-vote will have the effect of a vote against the
proposal, unless holders of more than 50 percent in interest of all securities
entitled to vote on the proposal cast votes, in which event neither an
abstention nor a broker non-vote will have any effect on the result of the vote.
The affirmative vote of a majority of all of the votes cast at a meeting at
which a quorum is present is required for approval of the 1999 Employee Stock
Purchase Plan. For purposes of the vote on this proposal, abstentions and broker
non-votes will not be counted as votes cast and will have no effect on the
result of the vote.
<PAGE>   4
 
     Each holder of record of common stock on the Record Date is entitled to
cast one vote per share of common stock held by such stockholder on each nominee
for director and each proposal presented to stockholders of Unitrode at the
Annual Meeting.
 
     As of the Record Date, directors and executive officers of Unitrode and
their affiliates had the right to cast votes representing approximately 3.05 %
of all votes represented by the issued and outstanding shares of common stock.
Such persons have indicated to Unitrode that they intend to cast all of such
votes in favor of each of the proposals listed on the proxy.
 
     All shares of common stock represented by properly executed proxies
received prior to or at the Annual Meeting will, unless such proxies shall have
been revoked, be voted in accordance with the instructions indicated therein. If
no instructions are indicated on a properly executed proxy, the shares will be
voted FOR each of the nominees for director named below and FOR approval of each
of the other proposals listed on such proxy. Stockholders may also vote in
person at the Annual Meeting even if they have previously returned a proxy card.
 
                             ELECTION OF DIRECTORS
 
     The Charter of the Corporation provides that the Board of Directors shall
be divided into three classes, as nearly equal in number as possible, and that
one class shall be elected each year for a term of three years. Louis E. Lataif
and James T. Vanderslice are currently serving in the class of directors of the
Corporation whose term expires at this Annual Meeting. Mr. Lataif and Mr.
Vanderslice have been nominated for election to three-year terms which will
expire in 2002. On August 3, 1998, Dietrich R. Erdmann was elected a director by
the Board of Directors in the class whose term expires in 2000 to fill a vacancy
on the Board created by the resignation of Kenneth Hecht as a director and to
serve until the 1999 Annual Meeting of Stockholders. Also, at that time, the
Board of Directors was increased from six to eight directors, and Alan R.
Schuele was elected a director by the Board in the class whose term expires in
2001 and to serve until the 1999 Annual Meeting of Stockholders and Derrell C.
Coker was elected a director by the Board in the class whose term expires in
1999. Mr. Coker will not stand for reelection. Mr. Erdmann has been nominated to
a one-year term in the class of directors whose term will expire at the Annual
Meeting of Stockholders in 2000 and Mr. Schuele has been nominated to a two-year
term in the class of directors whose term will expire at the Annual Meeting of
Stockholders in 2001. The persons named in the accompanying proxy will vote,
unless authority is withheld, for the election of the nominees named below, to
serve for the specified terms and until their successors are duly elected and
qualify, or until their earlier resignation or removal. If a nominee should
become unavailable for election, which is not anticipated, the persons named in
the accompanying proxy will vote for such substitute as the Board of Directors
may nominate.
 
                                        2
<PAGE>   5
 
     The following table sets forth information concerning the nominees for
election and directors whose terms continue beyond the date of this Annual
Meeting.
 
<TABLE>
<CAPTION>
                                          YEAR FIRST     PRINCIPAL OCCUPATION, OTHER BUSINESS EXPERIENCE
                                           ELECTED A              DURING THE PAST FIVE YEARS AND
               NAME                 AGE    DIRECTOR          DIRECTORSHIPS IN OTHER PUBLIC COMPANIES
               ----                 ---   ----------     -----------------------------------------------
<S>                                 <C>   <C>           <C>
NOMINEES WHOSE TERMS
EXPIRE IN 2002:
 
Louis E. Lataif(2)(3).............  60       1995       Dean of the School of Management at Boston
                                                        University from 1991 to present. From 1981 to
                                                        1991, Vice President of Ford Motor Company.
                                                        Director of Bank Audi USA and Great Lakes Chemical
                                                        Company.
 
James T. Vanderslice(1)...........  58       1995       Senior Vice President and Group Executive of IBM
                                                        Corporation. Vice President and General Manager of
                                                        the IBM Corporation Storage Systems Division from
                                                        August 1995 until 1998. From 1991 to 1995, General
                                                        Manager of the IBM Corporation high-end and mid-
                                                        range system printer business.
 
NOMINEE WHOSE TERM
EXPIRES IN 2001:
 
Alan R. Schuele(3)................  53       1998       President and Chief Operating Officer of Unitrode
                                                        Corporation. From May 1997 to August 1998,
                                                        President and Chief Executive Officer of BENCHMARQ
                                                        Microelectronics, Inc. Prior to 1997, various
                                                        senior executive positions at Crystal
                                                        Semiconductor, Inc. and Motorola Inc. Director of
                                                        XeTel Corporation.
 
NOMINEE WHOSE TERM
EXPIRES IN 2000:
 
Dietrich R. Erdmann(1)............  61       1998       Associate of Sevin Rosen Partners, a venture
                                                        capital firm. Marketing consultant serving Sevin
                                                        Rosen funds in Europe.
 
DIRECTOR WHOSE TERM
EXPIRES IN 2000:
 
Robert J. Richardson(3)...........  53       1997       Chairman and Chief Executive Officer of Unitrode
                                                        Corporation since August 1998. President and Chief
                                                        Executive Officer of Unitrode Corporation from
                                                        November 1997 to August 1998. Various senior
                                                        executive positions at Silicon Valley Group, Inc.
                                                        from 1992 to November 1997. Member, Board of
                                                        Trustees, Southern New Hampshire Medical Center.
</TABLE>
 
                                        3
<PAGE>   6
 
<TABLE>
<CAPTION>
                                          YEAR FIRST     PRINCIPAL OCCUPATION, OTHER BUSINESS EXPERIENCE
                                           ELECTED A              DURING THE PAST FIVE YEARS AND
               NAME                 AGE    DIRECTOR          DIRECTORSHIPS IN OTHER PUBLIC COMPANIES
               ----                 ---   ----------     -----------------------------------------------
<S>                                 <C>   <C>           <C>
DIRECTORS WHOSE TERMS
EXPIRE IN 2001:
 
William W. R. Elder(2)............  60       1998       Chairman, President and Chief Executive Officer of
                                                        Genus Inc., a company engaged in the design and
                                                        manufacturing of capital equipment for advanced
                                                        semiconductor manufacturing. Director of
                                                        Align-Rite International, Inc.
 
Robert L. Gable(3)................  68       1988       Chairman of the Board of Directors of Unitrode
                                                        Corporation until August 1998; Chief Executive
                                                        Officer of Unitrode Corporation from 1990 until
                                                        November 1997. President of Unitrode Corporation
                                                        from 1992 to January 1996. Director of New England
                                                        Business Services, Inc. and Ibis Technologies,
                                                        Inc.
</TABLE>
 
- ---------------
(1) Member of the Audit Committee.
 
(2) Member of the Executive Compensation Committee.
 
(3) Member of the Executive Committee.
 
                   BOARD MEETINGS AND COMMITTEES OF THE BOARD
 
     The Board of Directors has an Audit Committee, Executive Compensation
Committee and Executive Committee.
 
     All members of the Audit Committee are non-employee directors. The
principal functions of the Audit Committee are to review, with the Corporation's
independent accountants, the scope of the audit for each year, the results of
the audit when completed, the recommendations of the auditors and responses
thereto by management and the auditors' fees for services performed, taking into
account the relationship of audit and non-audit professional fees. The Audit
Committee also reviews, with management, matters brought to its attention by the
auditors relating to accounting systems, including internal accounting controls
and financial reporting. The Audit Committee met twice during the last fiscal
year.
 
     All members of the Executive Compensation Committee are non-employee
directors. The Executive Compensation Committee serves as the administrator of
all of the Corporation's benefit plans other than the Unitrode Profit
Sharing/401(k) Savings Plan. The Executive Compensation Committee reviews the
compensation of the Corporation's officers and recommends action to the Board
with respect to such officers' compensation, including salary adjustments and
the award of any cash bonuses. The Executive Compensation Committee also awards
restricted stock and grants of stock options under the Corporation's restricted
stock and stock option plans. The Executive Compensation Committee met twelve
times during the last fiscal year and performed other functions by unanimous
written consent in lieu of a meeting.
 
     The Executive Committee has all of the powers of the Board of Directors,
except as prohibited by applicable law. There were no meetings of the Executive
Committee during the last fiscal year.
 
     During the fiscal year, there were twelve meetings of the Board of
Directors. All of the Directors attended all of the meetings of the Board and of
committees of which they were members, other than Mr. Vanderslice who attended
more than 80% of the aggregate number of meetings of the Board and committees on
which he served.
 
                     DIRECTORS' FEES AND OTHER REMUNERATION
 
     Non-employee Directors of the Corporation are paid an annual fee of
$17,000, a fee of $2,500 for each day the Director participates in person in a
meeting of the Board and/or of any committee, $500 for
 
                                        4
<PAGE>   7
 
participation in any such meeting by telephone conference call, and
reimbursement of expenses for attendance at meetings. Non-employee Directors
also receive grants of stock options under the Corporation's Amended and
Restated 1986 Non-Employee Directors Stock Option Plan. Each non-employee
Director is automatically granted an option to acquire 2,000 shares of the
Corporation's common stock on the date of his appointment or election to the
Board of Directors. Following the initial grant, each then-current non-employee
Director is automatically granted an option for 2,000 shares on the date of each
annual meeting of the stockholders of the Corporation. Options are granted at
fair market value on the date of the grant and become exercisable in full in six
months from the date of the grant.
 
                     PRINCIPAL HOLDERS OF VOTING SECURITIES
 
     The following table sets forth as of April 9, 1999, those persons known to
the Corporation to be beneficial owners of more than five percent of the
outstanding shares of common stock of the Corporation. Unless otherwise
indicated, the persons named below have sole voting and investment power over
the shares listed below:
 
<TABLE>
<CAPTION>
                                                                   AMOUNT AND
                    NAME AND ADDRESS OF                            NATURE OF         PERCENT
                         BENEFICIAL                                BENEFICIAL           OF
                           OWNER                                   OWNERSHIP          CLASS
                    -------------------                            ----------        -------
<S>                                                             <C>                 <C>
Oppenheimer Capital.........................................    3,878,147 shares(1)    12.06%
  Oppenheimer Tower
  World Financial Center
  New York, NY 10281
 
United States Trust Company of New York.....................    1,784,768 shares(2)     5.55%
  114 West 47th Street
  New York, NH 10036-1532
 
Westport Asset Management, Inc..............................    1,803,200 shares(3)     5.61%
  253 Riverside Avenue
  Westport, CT 06880
</TABLE>
 
- ---------------
(1) Based upon a Schedule 13G filed with the Securities and Exchange Commission
    on February 11, 1999 by Oppenheimer Capital and/or certain investment
    advisory clients or discretionary accounts which states that, as of December
    31, 1998, such entities had shared voting and disposition powers with
    respect to these shares.
 
(2) Based upon a Schedule 13G filed with the Securities and Exchange Commission
    on February 12, 1999 which states that, as of December 31, 1998, U.S. Trust
    Company had shared voting and disposition power with respect to these shares
    via either a trust/fiduciary capacity and/or a portfolio management/agency
    relationship.
 
(3) Based upon a Schedule 13G filed with the Securities and Exchange Commission
    on February 16, 1999 which states that, as of February 16, 1999, Westport
    Asset Management, Inc. had sole voting and disposition power with respect to
    6,000 of such shares and shared voting and disposition power with respect to
    1,797,200 of such shares.
 
                                        5
<PAGE>   8
 
                       SECURITIES OWNERSHIP OF MANAGEMENT
 
     The following information is furnished as of April 9, 1999 with respect to
shares of common stock of the Corporation beneficially owned by each Director,
by each of the named executive officers, and by all directors and officers as a
group. Unless otherwise indicated, the individuals named had sole voting and
investment power over the shares listed.
 
<TABLE>
<CAPTION>
                                                                 SHARES        PERCENT OF
                                                              BENEFICIALLY    OUTSTANDING
                            NAME                                OWNED(1)      COMMON STOCK
                            ----                              ------------    ------------
<S>                                                           <C>             <C>
Derrell C. Coker............................................     114,725             *
William W. R. Elder.........................................       4,000             *
Dietrich R. Erdmann.........................................     609,212          1.89%
Robert L. Gable.............................................     288,500             *
Louis E. Lataif.............................................       8,000             *
Robert J. Richardson........................................     162,500(2)          *
Alan R. Schuele.............................................     300,000             *
James T. Vanderslice........................................      16,000             *
Allan R. Campbell...........................................     248,400(3)          *
Raymond G. Hawkins..........................................      31,000             *
All officers and directors as a group (13 persons)..........   1,937,997          6.03%
</TABLE>
 
- ---------------
  * Percentage is less than 1% of the total number of outstanding shares of
    common stock of the Corporation.
 
(1) Includes shares subject to options exercisable within 60 days from April 9,
    1999 for the purchase of the following numbers of shares: Mr. Coker 41,950
    shares; Mr. Elder 4,000 shares; Mr. Erdmann 4,000 shares; Mr. Gable 200,000
    shares; Mr. Lataif 8,000 shares; Mr. Richardson 112,500 shares; Mr. Schuele
    300,000 shares; Mr. Vanderslice 16,000 shares; Mr. Campbell 127,650 shares;
    Mr. Hawkins 25,000 shares; and all officers and directors as a group,
    957,600 shares. Also includes as to all officers and directors as a group an
    aggregate of 32,000 shares which are subject to reconveyance or forfeiture.
 
(2) Includes 32,000 shares in the case of Mr. Richardson which are subject to
    reconveyance or forfeiture.
 
(3) Includes 1,000 shares held by Mr. Campbell's spouse, as to which Mr.
    Campbell disclaims beneficial ownership.
 
                      BOARD COMPENSATION COMMITTEE REPORT
                           ON EXECUTIVE COMPENSATION
 
INTRODUCTION
 
     The Board of Directors of the Corporation has an Executive Compensation
Committee (the "Committee") consisting of the directors whose names are set
forth below this report. Each member of the Committee is a "non-employee
director" for purposes of Rule 16b-3 under the Securities Exchange Act of 1934
(the "Exchange Act"). This report, prepared by the Committee, sets forth
Unitrode's compensation policies for the fiscal year ended January 31, 1999, as
such policies affected Unitrode's executive officers.
 
COMPENSATION POLICY
 
     It is the policy of the Committee to link the compensation of the
Corporation's executive officers with the achievement of both corporate
performance objectives and individual objectives related to the executive
officers' specific areas of responsibility. It is also the policy of the
Committee to set executive compensation at levels it believes are consistent and
competitive with other companies in the semiconductor industry and at levels
that it believes will enable the Corporation to attract and retain superior
executive talent.
 
     The Committee also believes that ownership of the Corporation's stock by
management is an effective means of aligning the interests of the stockholders
and management in the enhancement of stockholder value. For this reason, the
Committee has used in the past and expects in the future to continue to use the
 
                                        6
<PAGE>   9
 
Corporation's stock option plans and restricted stock grants to encourage equity
ownership by management in the Corporation and to provide added long-term
incentive to management to work for the continued growth and success of the
Corporation.
 
RELATIONSHIP OF COMPENSATION TO COMPANY PERFORMANCE
 
     The compensation of the executive officers for the fiscal year ended
January 31, 1999 included base salary and the potential for annual variable
performance incentives earned under the Corporation's Management Bonus Program
(the "Management Bonus Program"). In addition, the Committee granted stock
options under the 1992 Employee Stock Option Plan. Total annual cash
compensation varies each year based upon achievement of Company financial
performance goals approved by the Board of Directors, achievement of agreed-upon
individual performance goals and changes in base salary.
 
     Base salaries are targeted to be competitive with other companies in the
Corporation's industry. Management examines salary survey data published by the
American Electronics Association for executives with similar responsibilities in
electronics companies and recommendations are made to the Committee and the
Board of Directors. Individual base salaries are then set or adjusted by the
Committee, subject to ratification by the Board of Directors, based on
experience, sustained performance and comparisons to peers inside and outside
the Corporation.
 
     The financial performance goal upon which payments under the Management
Bonus Program are based is earnings per share for the Corporation. Subjective
performance criteria encompass evaluation of each executive officer's initiative
and contribution to overall corporate performance, managerial ability,
performance on special projects undertaken and performance against previously
agreed-upon management objectives.
 
     In order for an executive to be eligible for any payment under the
Management Bonus Program, certain earnings-per-share thresholds must be met.
Payments under the Management Bonus Program to the executive officers for the
fiscal years ended January 31, 1997, 1998 and 1999 were made as indicated in the
Summary Compensation Table included in this Proxy Statement and were based on
the Committee's determination, in February 1997 and 1998 and in March 1999, of
the levels of attainment of the goals described above which had been established
by the Committee in February 1996, 1997 and 1998, respectively. No payments were
made to the executive officers under the Management Bonus Program for the year
ended January 31, 1999.
 
     Long-term incentives applicable to the executive officers consist of stock
awards made under the Corporation's 1984 Restricted Stock and Cash Bonus Plan
(the "Restricted Stock Plan"), a restricted stock grant to Mr. Richardson and
stock option grants made under the Corporation's 1983 and 1992 Employee Stock
Option Plans. The Restricted Stock Plan provides for the award of so-called
"restricted stock" which may not be transferred, with restrictions on transfer
lapsing for 20% of the grant for each year that the grantee remains employed by
the Corporation. Shares upon which restrictions have not lapsed are required to
be reconveyed to the Corporation if the executive's employment with the
Corporation is terminated. The Restricted Stock Plan has expired. Mr.
Richardson's grant of restricted stock is subject to conditions similar to those
contained in the Restricted Stock Plan, although the grant was made outside the
Restricted Stock Plan. Stock option grants provide the right to purchase shares
of the Corporation's common stock at the fair market value of such stock as of
the date of grant. Each stock option becomes exercisable in four equal
installments. The number of options granted is determined at the discretion of
the Committee. Generally, the higher the level of the executive officer, the
greater number of options granted. The Committee believes that the number of
shares covered by each grant reflects competitive industry practice, rewards
recipients for contribution to improvements in corporate performance, provides
an incentive for future performance and serves to align the interests of the
executive officers with the interests of all stockholders in the creation of
stockholder value.
 
     The Corporation has adopted the Unitrode Corporation Profit Sharing/401(k)
Savings Plan, which is a broad-based employee benefit plan in which all regular
employees are eligible to participate. Under the profit-sharing portion of the
plan, the Corporation makes an annual contribution to the plan's trust fund for
the account of a participant based upon the profit performance of the
Corporation. Under the 401(k) portion of the plan, the Corporation matches 50%
of an employee's contributions up to 4 percent of the employee's
 
                                        7
<PAGE>   10
 
annual eligible compensation as determined in accordance with the plan. The
executive officers participate in certain other broad-based benefit plans in
which benefits are not directly or indirectly tied to the Corporation's
performance.
 
MR. RICHARDSON'S COMPENSATION FOR THE FISCAL YEAR ENDED JANUARY 31,
1999
 
     On November 11, 1997, Mr. Richardson joined Unitrode and was elected
President and Chief Executive Officer and a director. On August 3, 1998, Mr.
Richardson was named Chairman of the Board of Directors. At that time, he
relinquished the position of President. Mr. Richardson's base salary for the
fiscal year ended January 31, 1999 was $360,000 per annum. He was also
designated a participant in the Management Bonus Program for that year. During
the year, he was awarded options to purchase 200,000 shares of Unitrode Common
Stock at an exercise price of $13.50 (the fair market value of Unitrode's stock
on the date of the grant). No bonuses were paid under the Management Bonus Plan
for the fiscal year ended January 31, 1999, and Mr. Richardson received no base
salary adjustment during the year.
 
     In determining Mr. Richardson's compensation package as Chairman and Chief
Executive Officer, the Committee considered such factors as comparable
compensation of chief executive officers at similarly-sized semiconductor
companies, Mr. Richardson's skills and experience, and the compensation
necessary to attract and retain an executive of Mr. Richardson's talent and
experience to Unitrode.
 
                                            Respectfully submitted,
 
                                            LOUIS E. LATAIF, Chairman
                                            WILLIAM W. R. ELDER
 
                                        8
<PAGE>   11
 
                             EXECUTIVE COMPENSATION
 
SUMMARY COMPENSATION
 
     The following table shows, as to the Chief Executive Officer and each of
the five other most highly compensated executive officers, information
concerning compensation paid for services to the Corporation in all capacities
during the fiscal year ended January 31, 1999, as well as compensation paid to
each such individual for the Corporation's two previous fiscal years:
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                                   LONG-TERM
                                             ANNUAL COMPENSATION              COMPENSATION AWARDS
                                     ------------------------------------    ----------------------
                             FY                              OTHER ANNUAL    RESTRICTED     NUMBER      ALL OTHER
         NAME AND           ENDED                            COMPENSATION      STOCK          OF       COMPENSATION
    PRINCIPAL POSITION      1/31      SALARY      BONUS          (2)           AWARDS      OPTIONS         (3)
    ------------------      -----    --------    --------    ------------    ----------    --------    ------------
<S>                         <C>      <C>         <C>         <C>             <C>           <C>         <C>
Robert J. Richardson(1)...  1999     $353,352    $      0      $216,564            --      200,000       $ 9,387
  Chairman & Chief          1998     $ 82,500    $116,000            --        50,000      450,000       $     0
  Executive Officer
 
Robert L. Gable(1)........  1999     $169,349    $      0      $      0            --            0       $ 8,460
  Former Chairman of the    1998     $220,000    $238,524      $108,216            --            0       $18,183
  Board...................  1997     $220,000    $      0      $ 66,710            --            0       $11,113
 
Alan R. Schuele(1)........  1999     $125,004    $      0      $      0            --      150,000       $ 2,100
  President & Chief
  Operating Officer
 
Raymond G. Hawkins(1).....  1999     $146,966    $      0      $      0            --      100,000       $ 2,400
  Executive Vice
  President, Sales &
  Marketing
 
Cosmo S. Trapani(1).......  1999     $206,237    $      0      $      0            --       25,000       $ 6,060
  Former Executive Vice     1998     $207,333    $227,682      $ 10,012            --       27,000       $17,367
  President & Chief         1997     $199,000    $      0      $ 17,374            --       40,000       $10,444
  Financial Officer
 
Allan R. Campbell.........  1999     $173,871    $      0      $      0            --       25,000       $ 5,730
  Senior Vice President,    1998     $174,667    $191,903      $ 10,012            --       22,800       $17,077
  General Counsel &         1997     $167,750    $      0      $ 17,374            --       40,000       $10,242
  Secretary
</TABLE>
 
- ---------------
(1) Mr. Gable resigned as Chairman of the Board of Directors of the Corporation
    on August 3, 1999; Mr. Richardson was elected Chairman and Chief Executive
    Officer on August 3, 1999 and was, prior to that time, President and Chief
    Executive Officer of the Corporation. Mr. Schuele was elected President and
    Chief Operating Officer of the Corporation on August 3, 1998. Mr. Hawkins
    was elected Executive Vice President, Sales and Marketing, on May 6, 1998.
    Mr. Trapani resigned as Executive Vice President and Chief Financial Officer
    on January 31, 1999.
 
(2) Amounts paid were bonuses based on taxes incurred on vesting of restricted
    stock pursuant to the Corporation's 1984 Restricted Stock and Cash Bonus
    Plan, except in the case of Mr. Richardson where the amount paid was for
    relocation expenses.
 
(3) "All Other Compensation" includes profit sharing and matching contributions
    made to the Corporation's Profit Sharing/401(k) Savings Plan.
 
OPTION GRANTS
 
     The Corporation's 1983 Stock Option Plan and 1992 Employee Stock Option
Plan provide for the grant of options to officers and key employees of the
Corporation. Options granted under the plans may be either "non-qualified
options" or "incentive stock options". The exercise price is determined by the
Executive Compensation Committee and may not be less than 100% of the fair
market value of the common stock of the Corporation on the date of the grant of
the options. The options expire not more than ten years from the date
 
                                        9
<PAGE>   12
 
of the grant, and may be exercised only while the optionee is employed by the
Corporation, or within one year after death or disability or within sixty days
after termination of employment. The Executive Compensation Committee may
determine when options granted may be exercisable. Options are normally granted
to be exercisable at the rate of one-quarter of the grant per year, commencing
six months or one year from the date of the grant. In the event of a change of
control of the Corporation, the Board of Directors may make all options
immediately vested and exercisable. As of April 27, 1992, no further options
were granted under the 1983 Stock Option Plan.
 
     The following table shows, as to the individuals named in the Summary
Compensation Table above, information concerning stock options granted during
the fiscal year ended January 31, 1999.
 
                       OPTION GRANTS IN LAST FISCAL YEAR
 
<TABLE>
<CAPTION>
                                          INDIVIDUAL GRANTS
                          --------------------------------------------------      POTENTIAL REALIZABLE
                                       % OF TOTAL                                  VALUES AT ASSUMED
                                         OPTIONS                                  ANNUAL RATE OF STOCK
                           NUMBER      GRANTED TO                                PRICE APPRECIATION FOR
                             OF         EMPLOYEES                                    OPTION TERM(1)
                           OPTIONS      IN FISCAL     EXERCISE    EXPIRATION    ------------------------
          NAME             GRANTED        YEAR         PRICE         DATE           5%           10%
          ----            ---------    -----------    --------    ----------    ----------    ----------
<S>                       <C>          <C>            <C>         <C>           <C>           <C>
Robert J. Richardson....   200,000        9.69%       $  13.50      8/3/08      $1,698,015    $4,303,105
Robert L. Gable.........         0          --              --          --              --            --
Alan R. Schuele.........   150,000        7.27%       $  13.50      8/3/08      $1,273,512    $3,227,328
Raymond G. Hawkins......   100,000        4.84%       $16.0313      5/6/08      $1,008,200    $2,554,976
Cosmo S. Trapani........    25,000        1.21%       $  13.50      8/3/08      $  212,252    $  537,888
Allan R. Campbell.......    25,000        1.21%       $  13.50      8/3/08      $  212,252    $  537,888
</TABLE>
 
- ---------------
 
(1) The 5% and the 10% assumed rates of appreciation, using the stock price as
    of the date of grant as the basis, are mandated by the rules of the
    Securities and Exchange Commission and do not represent the Corporation's
    estimate or projection of the future value of the Corporation's common
    stock.
 
OPTION EXERCISES AND YEAR-END VALUES
 
     The following table shows, as to the individuals named in the Summary
Compensation Table above, information concerning stock options exercised during
the fiscal year ended January 31, 1999.
 
                         AGGREGATED OPTION EXERCISES IN
               LAST FISCAL YEAR AND FISCAL YEAR-END OPTION VALUES
 
<TABLE>
<CAPTION>
                                                                                             VALUE OF
                                                              NUMBER OF                     UNEXERCISED
                             SHARES                      UNEXERCISED OPTIONS           IN-THE-MONEY OPTIONS
                           ACQUIRED ON                      AT FY END(#)                     AT FY END
                            EXERCISE      VALUE      ---------------------------    ---------------------------
          NAME                 (#)       REALIZED    EXERCISABLE   UNEXERCISABLE    EXERCISABLE   UNEXERCISABLE
          ----             -----------   --------    -----------   -------------    -----------   -------------
<S>                        <C>           <C>         <C>           <C>              <C>           <C>
Robert J. Richardson.....         0      $      0      112,500        537,500       $        0      $481,260
Robert L. Gable..........     4,000      $ 52,500      200,000              0       $   87,500      $      0
Alan R. Schuele..........         0      $      0      300,000        150,000       $  328,140      $360,945
Raymond G. Hawkins.......         0      $      0            0        100,000       $        0      $      0
Cosmo S. Trapani.........    16,400      $ 83,150       80,350         65,250       $  489,402      $ 93,284
Allan R. Campbell........    12,000      $104,625      123,700         62,100       $1,010,502      $ 93,284
</TABLE>
 
                      APPROVAL OF THE UNITRODE CORPORATION
                           1999 EQUITY INCENTIVE PLAN
 
     Background.  On April 22, 1999, the Unitrode Board adopted, subject to
stockholder approval, the Unitrode Corporation 1999 Equity Incentive Plan (the
"Plan"). The purpose of the Plan is to provide a means by which selected
employees and directors of the Corporation may be given an opportunity to
benefit from
 
                                       10
<PAGE>   13
 
increases in value of the stock of the Corporation through the granting of (i)
incentive stock options; (ii) non-qualified stock options; (iii) rights to
purchase restricted stock; (iv) and stock appreciation rights, on such terms and
conditions as the Corporation's Executive Compensation Committee may determine.
The Corporation believes that the Plan is necessary to retain the services of
persons who are now employees or directors of the Corporation, and to attract,
hire and retain high-quality people to the Corporation. The Corporation believes
that the competition for talented people in the semiconductor industry is
intense and that all the companies with which the Corporation competes for
employee and director talent offer equity participation to such individuals. The
Board expects that the Plan will enable the Corporation to effectively compete
for the people it needs by creating the opportunity to participate in the
success of the Corporation, while aligning the interests of these people with
the interests of the stockholders of the Corporation.
 
     The Corporation currently has in effect the following stock option plans:
(I) the Unitrode Corporation 1992 Employee Stock Option Plan, as amended; (ii)
the Benchmarq Microelectronics, Inc. 1989 Stock Option Plan; (iii) the Benchmarq
Microelectronics, Inc. 1995 Flexible Stock Option Plan; and (iv) the Unitrode
Corporation Amended and Restated 1986 Non-employee Director Option Plan (the
"Prior Plans"). The Board believes that it is advisable to replace the Prior
Plans with the Plan in order to provide a unified vehicle with flexible features
for the grant of equity-based incentives. Upon approval of the Plan, all shares
available for grant under the Prior Plans would be transferred to the Plan, and
no further grants would be made under the Prior Plans. See "Available Shares;
Types of Awards" below.
 
     The full text of the Plan is set forth as Appendix A to this Proxy
Statement. Reference should be made to the Plan for a complete statement of the
provisions summarized on the following pages, which summary is qualified by
reference to the full text of the Plan. The following is a summary of certain
provisions of the Plan.
 
     Administration.  The Plan provides for administration by a committee
appointed by the Board of Directors of the Corporation (the "Committee")
comprised of not fewer than two members of the Board, each of whom must be a
non-employee director within the meaning of Rule 16b-3 under the Securities and
Exchange Act of 1934 and an outside director within the meaning of Section
162(m) of the Internal Revenue Code of 1986, as amended (the "Code"). The
Committee shall have the power under the Plan to determine which of the persons
eligible under the Plan shall be granted a Stock Award pursuant to the Plan,
which may include an Incentive Stock Option ("ISO"), a nonqualified stock option
("NQSO"), a right to purchase restricted stock, a stock appreciation right, or a
combination of the foregoing. The Committee may also determine the provisions of
each Stock Award under the Plan and the number of shares with respect to which
Stock Awards shall be granted. The Committee shall also have the power to
construe and interpret the Plan and Stock Awards granted under it and to
establish, amend and revoke rules and regulations for the Plan's administration.
 
     Eligibility for Participation.  All employees of the Corporation or of any
of its subsidiaries and directors of the Corporation are eligible to be selected
to participate in the Plan. The selection of recipients from among employees and
directors is within the discretion of the Committee.
 
     Available Shares; Types of Awards.  The number of shares of stock that may
be issued pursuant to Stock Awards under the Plan is equal to (i) 1,800,000
shares of the Corporation's Common Stock, $.01 par value per share; and (ii) any
shares of the Corporation's Common Stock available, as of the date of approval
of the Plan by the stockholders, for future awards under the Prior Plans. As of
April 9, 1999, there were outstanding under the Prior Plans options to purchase
5,580,361 shares of the Corporation's Common Stock at a weighted average option
price of $ 14.3476 per share with expiration dates ranging from March 15, 1999
to March 3, 2009. As of April 9, 1999, there were 1,351,418 shares of the
Corporation's Common Stock available for grant under the Prior Plans. On April
9, 1999, the average of the high and low prices of the Corporation's Common
Stock was $ 15.0625. As of the date that the Plan is approved by the
stockholders, no further grants will be made under the Prior Plans.
 
                                       11
<PAGE>   14
 
     The following table shows as to the named executive officers of the
Corporation who hold options under the Prior Plans, as to the current executive
officers and directors who are not executive officers as a group, and as to all
non-officer employees of the Corporation as a group (i) the number of shares
covered by options granted between January 1, 1990 and April 9, 1999 and the
weighted average per share option price thereof and (ii) the number of shares
acquired during such period upon the exercise of options and the net value
realized upon such exercise.
 
                           OPTIONS UNDER PRIOR PLANS
 
<TABLE>
<CAPTION>
                                                      GRANTED                    EXERCISED
                                                  JANUARY 1, 1990             JANUARY 1, 1990
                                                 TO APRIL 9, 1999             TO APRIL 9, 1999
                                             -------------------------    ------------------------
                                             NUMBER OF      WEIGHTED      NUMBER OF
                                             SHARES OF    AVERAGE PER     SHARES OF     AGGREGATE
                                              COMMON      SHARE OPTION     COMMON       NET VALUE
                                               STOCK         PRICE          STOCK      REALIZED(1)
                                             ---------    ------------    ---------    -----------
<S>                                          <C>          <C>             <C>          <C>
Robert J. Richardson.......................    650,000      $20.8342              0              0
Robert L. Gable............................    400,000      $ 8.9297        204,000    $ 2,537,311
Alan R. Schuele............................    450,000      $14.3750              0              0
Raymond G. Hawkins.........................    100,000      $16.0313              0              0
Cosmo S. Trapani...........................    282,000      $ 8.2203        161,400    $ 1,326,683
Allan R. Campbell..........................    277,800      $ 8.0753        103,750    $ 1,117,525
All current executive officers as a group
  (9 persons)..............................  2,520,800      $13.0119        539,150    $ 6,051,219
All current directors who are not executive
  officers as a group (5 persons)..........     81,950      $12.6724              0              0
Non-Officer employees as a group (1,109
  persons).................................  5,212,920      $12.8775      2,842,617    $19,837,995
</TABLE>
 
- ---------------
 
(1) Represents the difference between the option price and the fair market value
    of the shares of Unitrode Common Stock acquired as of the date of exercise.
 
     As more fully described below, the Plan provides for the grant of stock
options, including ISOs and NQSOs, stock appreciation rights ("SARs"), a right
to purchase restricted stock, or a combination of the foregoing.
 
     Stock Options and SARs.  Each NQSO and ISO shall entitle the holder to
purchase a specified number of shares of Common Stock as determined by the
Committee. The exercise price of each ISO and NQSO granted under the Plan is set
by the Committee at the time each ISO and NQSO is granted and shall not be less
than the fair market value of a share of Common Stock on the date on which such
ISO or NQSO is granted. The exercise price may be paid (i) in cash, or (ii) at
the discretion of the Committee, either at the time of the grant or the exercise
of the option, (A) by delivery of other Common Stock of the Corporation, (B)
according to a deferred payment or other arrangement, or (C) any other form of
legal consideration that may be acceptable to the Committee. In any deferred
payment or other arrangement, including a promissory note, the stock so acquired
shall be pledged to the Corporation as security for payment. An ISO or NQSO may
be exercisable for a term established by the Committee, but in no event to
exceed ten years.
 
     The Committee may grant SARs, which entitle the recipient to receive a
payment equal to the excess of the fair market value on the date of exercise of
a stated number of shares of Common Stock over the exercise price specified in
an option or SAR agreement. The payment may be made in cash or in shares of the
Corporation's Common Stock, or partly in cash and partly in shares, at the
discretion of the Committee. SARs may be granted in tandem with options, in
which case the option is cancelled to the extent the tandem SAR is exercised and
the tandem SAR is cancelled to the extent the related option is exercised, or as
free-standing SARs.
 
     ISOs and SARs granted under the Plan are not transferable otherwise than by
will or under the laws of descent and distribution. A NQSO may be transferable
to the extent specified in an option agreement, on such
 
                                       12
<PAGE>   15
 
terms as the Committee may determine in its discretion. Options and SARs are
cancelled upon termination of employment or the option holder ceasing to be a
director, except that exercise after termination is permitted in certain cases,
including those instances when employment or directorship terminates because of
the recipient's retirement, death or disability.
 
     Restricted Stock Purchases.  The Committee may award the right to purchase
restricted stock under the Plan. The purchase price for restricted stock shall
be such amount as the Committee shall determine. The purchase price of stock
acquired shall be paid either: (i) in cash at the time of purchase, (ii) at the
discretion of the Committee, according to a deferred payment or other
arrangement with the person to whom the stock is sold, or (iii) in any other
form of legal consideration that may be acceptable to the Committee in its
discretion. Shares of stock sold or awarded under the Plan may, but need not, be
subject to a repurchase option in favor of the Corporation in accordance with a
vesting schedule to be determined by the Committee. In the event that the holder
of stock so awarded or purchased terminates continuous status as an employee or
director, the Corporation will repurchase or otherwise reacquire any or all of
the shares of stock held by that person which have not vested as of the date of
termination.
 
     Certain Federal Income Tax Consequences.  A recipient recognizes no taxable
income at the time a stock option is granted under the Plan. With regard to
NQSOs, ordinary income is recognized by the recipient at the time of his or her
exercise of an option. The amount of income recognized is equal to the excess of
the fair market value of the shares on the date of exercise over the exercise
price. Tax withholding is required on such income. When a recipient disposes of
shares acquired upon exercise, the excess over the fair market value of the
shares on the date of the exercises will be treated as long- or short-term
capital gain, depending upon the holding period of the shares; and if the amount
received is less than the fair market value of the shares on the date of
exercise, the difference will be treated as long- or short-term capital loss,
depending upon the holding period of the shares.
 
     With regard to ISOs, no income is recognized by a recipient upon exercise.
However, the excess of the fair market value of the shares received on exercise
over the exercise price is an adjustment to the recipient's taxable income for
purposes of computing the recipient's alternative minimum taxable income.
Assuming compliance with applicable holding period requirements, a recipient
realizes long-term capital gain or loss when he or she disposes of his or her
shares, measured by the difference between the exercise price and the amount
received for the shares at the time of disposition. If the recipient disposes of
shares acquired by the exercise of the option before the expiration of at least
one year from the date of exercise and two years from the date of grant of the
option, any amount realized from such disqualifying disposition is taxable as
ordinary income in the year of disposition to the extent that the lesser of (i)
fair market value of the shares received on the date the option was exercised or
(ii) the amount realized upon such disposition exceeds the exercise price. Any
amount realized in excess of fair market value of the shares received on the
date of exercise will be treated as long- or short-term capital gain, depending
upon the holding period of the shares. If the amount realized upon such
disposition is less than the exercise price, the difference is treated as long-
or short-term capital loss, depending upon the holding period of the shares.
 
     Participants who exercise SARs will recognize ordinary income at the time
of exercise equal to the amount of the payment to which they are entitled upon
exercise, regardless of whether such amount is paid in cash or shares.
 
     No deduction is allowed to the Corporation for federal income tax purposes
at the time of grant of a NQSO or at the time of grant or exercise of an ISO.
The Corporation is entitled to a deduction for federal income tax purposes at
the same time and in the same amount as the recipient is considered to have
recognized ordinary income in connection with the exercise of a NQSO or SAR. In
the event of a disqualifying disposition of shares received upon exercise of an
ISO, the Corporation is entitled to a deduction for the amount taxable to the
recipient as ordinary income.
 
     The receipt of the right to purchase restricted stock does not result in
compensation income to the participant or a deductible expense for the
Corporation until the restrictions on the transfer of the stock lapse or it is
no longer subject to a substantial risk of forfeiture. At the time restrictions
on the transfer of such stock lapse or when there is no longer a substantial
risk of forfeiture of such stock, the holder thereof will be subject
                                       13
<PAGE>   16
 
to tax at ordinary income rates on the fair market value of such stock on the
date restrictions lapse, reduced by any amount the holder may have paid for the
stock. The Corporation will be entitled to a deduction to the extent of the
amount taxed to the participant at the time such amounts become taxable. The
amount deductible by the Corporation may be equal to, greater than, or less than
the amount accrued as compensation expense in the financial statements. The
resulting difference, if any, in income tax benefit realized versus compensation
expense amortized will be charged or credited to capital in excess of par value.
Alternatively, participants may elect to recognize ordinary income on the date
the restricted shares are acquired equal to the fair market value of the shares
under Section 83(b) of the Code, in which case the Corporation will be entitled
to a deduction at the time of such election. If a participant elects to
recognize ordinary income upon the receipt of restricted shares, the fair market
value of such shares shall be determined without regard to restrictions imposed
by the Plan. The participant's tax basis will be increased by the amount
recognized as ordinary income upon such election. If such election is made, when
restrictions on transfer of the stock lapse no income will be recognized by the
participant, and no deduction may be taken by the Corporation.
 
     Compliance with Section 162(m).  The Plan should allow certain ISOs, NQSOs
and performance-based awards granted under the Plan to be treated as qualified
performance-based compensation under Section 162(m) of the Code. However, the
Committee may, from time to time, award compensation that is not
performance-based and accordingly, may not be deductible as a result of the
limit on deductions set forth in Code Section 162(m).
 
     Amendment.  The Committee may amend, suspend or terminate the Plan at any
time. However, except pursuant to the anti-dilution provisions of the Plan, no
amendment shall be effective unless approved by the stockholders of the
Corporation, to the extent that stockholder approval is required for the Plan to
satisfy the provisions of Sections 422 and 162(m) of the Code, Rule 16b-3 under
the Exchange Act or New York Stock Exchange listing requirements.
 
     Board Recommendation.  The Board of Directors has approved the Plan and
unanimously recommends that the stockholders vote FOR its approval.
 
                      APPROVAL OF THE UNITRODE CORPORATION
                       1999 EMPLOYEE STOCK PURCHASE PLAN
 
     Background.  The Unitrode Corporation 1999 Employee Stock Purchase Plan
(the "Purchase Plan") allows the Corporation to encourage stock ownership by its
employees who reside in the United States. On April 22, 1999, the Board of
Directors adopted, subject to stockholder approval, the Purchase Plan. The Board
of Directors believes it is in the best interests of the Corporation to
encourage stock ownership by its employees. The full text of the Purchase Plan
is set forth as Appendix B to this Proxy Statement. Reference should be made to
the Purchase Plan for a complete statement of the provisions summarized in these
pages.
 
     Administration and Eligibility.  The Purchase Plan is administered by the
Executive Compensation Committee of the Board of Directors which is authorized
to decide questions of eligibility and to make rules and regulations for the
administration and interpretation of the Purchase Plan.
 
     All U.S. employees employed by the Corporation or its subsidiaries on the
applicable offering commencement date are eligible to participate in the
Purchase Plan.
 
     Offerings under the Plan will be made semi-annually with offerings to
commence on January 1 and July 1. During each offering, the maximum number of
shares which may be purchased by a participating employee is determined on the
first day of the offering period under a formula whereby 85% of the market value
of a share of Common Stock on the first day of the offering period is divided
into an amount equal to that percentage of such employee's current base salary
for the period that he/she has elected to have withheld (but not in any case in
excess of 10%), provided, however, that no employee may purchase more than 1,000
shares during any one offering. An employee may elect to have up to 10% deducted
from his or her regular salary (as adjusted) for this purpose. The price at
which the employee's option is exercised is the lower of (i) 85% of the closing
price of the Common Stock on the New York Stock Exchange on the day that an
offering commences or (ii) 85% of the closing price on the day that the offering
terminates.
                                       14
<PAGE>   17
 
     Amendment of the Purchase Plan.  The Board of Directors may modify or amend
the Purchase Plan in any respect without stockholder approval, unless such
stockholder approval is required (i) under Section 423 of the Code, (ii) under
Rule 16b-3 of the Securities Exchange Act of 1934, or (iii) under New York Stock
Exchange listing requirements.
 
     Federal Income Tax Consequences.  The following is a summary of the United
States federal income tax consequences that generally will arise with respect to
purchases made under the Purchase Plan and with respect to the sale of Common
Stock acquired under the Purchase Plan.
 
          Tax Consequences to Participants.  In general, a participant will not
     recognize taxable income upon enrolling in the Purchase Plan or upon
     purchasing shares of Common Stock at the end of an offering. Instead, if a
     participant sells Common Stock acquired under the Purchase Plan at a sale
     price that exceeds the price at which the participant purchased the Common
     Stock, then the participant will recognize taxable income in an amount
     equal to the excess of the sale price of the Common Stock over the price at
     which the participant purchased the Common Stock. A portion of that taxable
     income will be ordinary income, and a portion may be capital gain.
 
          If the participant sells the Common Stock more than one year after
     acquiring it and more than two years after the date on which the offering
     commenced (the "Grant Date"), then the participant will be taxed as
     follows. If the sale price of the Common Stock is higher than the price at
     which the participant purchased the Common Stock, then the participant will
     recognize ordinary compensation income in an amount equal to the lesser of:
 
             (i) fifteen percent of the fair market value of the Common Stock on
        the Grant Date; or
 
             (ii) the excess of the sale price of the Common Stock over the
        price at which the participant purchased the Common Stock.
 
          Any further income will be long-term capital gain. If the sale price
     of the Common Stock is less than the price at which the participant
     purchased the Common Stock, then the participant will recognize long-term
     capital loss in an amount equal to the excess of the price at which the
     participant purchased the Common Stock over the sale price of the Common
     Stock.
 
          If the participant sells the Common Stock within one year after
     acquiring it or within two years after the Grant Date (a "Disqualifying
     Disposition"), then the participant will recognize ordinary compensation
     income in an amount equal to the excess of the fair market value of the
     Common Stock on the date that it was purchased over the price at which the
     participant purchased the Common Stock. The participant will also recognize
     capital gain in an amount equal to the excess of the sale price of the
     Common Stock over the fair market value of the Common Stock on the date
     that it was purchased, or capital loss in an amount equal to the excess of
     the fair market value of the Common Stock on the date that it was purchased
     over the sale price of the Common Stock. This capital gain or loss will be
     a long-term capital gain or loss if the participant has held the Common
     Stock for more than one year prior to the date of the sale and will be a
     short-term capital gain or loss if the participant has held the Common
     Stock for a shorter period.
 
          Tax Consequences to the Company.  The offering of Common Stock under
     the Purchase Plan will have no tax consequences to the Company. Moreover,
     in general, neither the purchase nor the sale of Common Stock acquired
     under the Purchase Plan will have any tax consequences to the Company
     except that the Company will be entitled to a business-expense deduction
     with respect to any ordinary compensation income recognized by a
     participant upon making a Disqualifying Disposition. Any such deduction
     will be subject to the limitations of Section 162(m) of the Code.
 
     Board Recommendation.  The Board of Directors has approved the Purchase
Plan and unanimously recommends that the stockholders vote FOR its approval.
 
                                       15
<PAGE>   18
 
                               PERFORMANCE GRAPH
 
     The following graph shows a five-year comparison of cumulative total
stockholder returns for the Corporation, the Standard & Poor's 500 Stock Index
and the Standard & Poor's Electronics (Semiconductors) Index.
 
                 COMPARISON OF 5 YEAR CUMULATIVE TOTAL RETURN*
                 AMONG UNITRODE CORPORATION, THE S&P 500 INDEX
                 AND THE S&P ELECTRONICS (SEMICONDUCTORS) INDEX
 
<TABLE>
<CAPTION>
                                                                                                             S&P ELECTRONICS
                                                  UNITRODE CORPORATION               S&P 500                (SEMICONDUCTORS)
                                                  --------------------               -------                ----------------
<S>                                             <C>                         <C>                         <C>
1/94                                                     100.00                      100.00                      100.00
1/95                                                     125.00                      101.00                      113.00
1/96                                                     176.00                      139.00                      140.00
1/97                                                     247.00                      176.00                      331.00
1/98                                                     244.00                      224.00                      336.00
1/99                                                     215.00                      296.00                      577.00
</TABLE>
 
        * $100 INVESTED ON 1/31/94 IN STOCK OR INDEX-
         INCLUDING REINVESTMENT OF DIVIDENDS.
         FISCAL YEAR ENDING JANUARY 31.
 
                            INDEPENDENT ACCOUNTANTS
 
     The Board of Directors, upon the recommendation of the Audit Committee, has
selected PricewaterhouseCoopers LLP to be the independent accountants for the
Corporation for the fiscal year ending January 31, 2000. Representatives of
PricewaterhouseCoopers LLP will be present at the Annual Meeting and will have
the opportunity to make a statement if they desire to do so and will be
available to respond to appropriate questions.
 
                     CHANGE OF CONTROL SEVERANCE AGREEMENTS
 
     The Corporation has entered into Change of Control Severance Agreements
(the "Agreements") with its executive officers. The Agreements provide that if a
"Change of Control" (as defined in the Agreements) of the Corporation should
occur, and if within two years thereafter the employment of the executive is
terminated for reasons other than death, disability, retirement, or "Cause" (as
defined in the Agreements), or the executive voluntarily terminates his or her
employment for "Good Reason" (as defined in the Agreements), severance
compensation will be payable. The amount of severance compensation would be
approximately twice the executive's then current annual base salary, plus twice
the largest annual bonus paid to the executive during the five-year period
immediately preceding the change of control. In addition, the
 
                                       16
<PAGE>   19
 
executive would be entitled to continued employee benefits for a period of two
years from the date of termination. Also, to the extent that payments to the
executive pursuant to his/her Agreement (together with any other payments or
benefits, such as the accelerated vesting of stock options or restricted stock
awards, received by the executive in connection with a Change in Control) would
result in the triggering of the provisions of Sections 280G and 4999 of the
Code, the Agreement provides for the payment of an additional amount such that
the executive would receive, net of excise taxes, the amount he/she would have
been entitled to receive in the absence of the excise tax provided in Section
4999 of the Code.
 
                              ADVANCE NOTICE BYLAW
 
     The Bylaws of the Corporation provide that in order for a stockholder to
nominate a candidate for election as a Director at an annual meeting of
stockholders or propose business for consideration at such meeting, notice must
be given to the Secretary of the Corporation no more than 90 days nor less than
60 days prior to the first anniversary of the preceding year's annual meeting.
The fact that the Corporation may not insist upon compliance with these
requirements should not be construed as a waiver by the Corporation of its right
to do so at any time in the future.
 
                             STOCKHOLDER PROPOSALS
 
     Under regulations adopted by the Securities and Exchange Commission,
stockholder proposals must be submitted to the Secretary of the Corporation no
later than January 4, 2000, in order to be considered for inclusion in the proxy
materials for the annual meeting to be held in 2000. The inclusion of any such
proposal will be subject to applicable rules of the Securities and Exchange
Commission and the Corporation's Advance Notice Bylaw (see preceding paragraph).
 
                        COMPLIANCE WITH SECTION 16(A) OF
                      THE SECURITIES EXCHANGE ACT OF 1934
 
     Section 16(a) of the Securities Exchange Act of 1934 requires the
Corporation's directors, executive officers and beneficial owners of more than
ten percent of its equity securities to file with the Securities and Exchange
Commission initial reports of their ownership and reports of changes in
ownership of the Corporation's common stock and other equity securities.
Officers, directors and greater-than-ten-percent beneficial owners of the
Corporation's common stock are required by Securities and Exchange Commission
regulation to furnish the Corporation with copies of all forms filed by them
under Section 16(a) of the Securities Exchange Act of 1934.
 
     To the Corporation's knowledge, based solely upon the review of copies of
such reports furnished to the Corporation and written representations that no
other reports were required, during the fiscal year ended January 31, 1999, all
Section 16(a) filing requirements applicable to its officers, directors and
greater-than-ten-percent beneficial owners were complied with.
 
                                 OTHER MATTERS
 
     Management knows of no other matters which may properly be and are likely
to be brought before the meeting. However, if any other matters properly come
before the meeting, the persons named in the enclosed proxy will vote said proxy
in accordance with their discretion.
 
                                            By Order of the Board of Directors
 
                                            ALLAN R. CAMPBELL
                                            Senior Vice President,
                                            General Counsel and Secretary
Merrimack, New Hampshire
April 27, 1999
 
                                       17
<PAGE>   20
 
                                                                      APPENDIX A
 
                              UNITRODE CORPORATION
 
                           1999 EQUITY INCENTIVE PLAN
 
1.  PURPOSES.
 
     (a) The purpose of the Unitrode Corporation 1999 Equity Incentive Plan (the
"Plan") is to provide a means by which selected Employees and Directors of
Unitrode Corporation (the "Company"), and its Affiliates, may be given an
opportunity to benefit from increases in value of the stock of the Company
through the granting of (i) Incentive Stock Options, (ii) Nonqualified Stock
Options, (iii) rights to purchase Restricted Stock, and (iv) Stock Appreciation
Rights on such terms and conditions as the Board of Directors of the Company
(the "Board") may determine.
 
     (b) The Company, by means of the Plan, seeks to retain the services of
persons who are now Employees or Directors of the Company and its Affiliates, to
secure and retain the services of new Employees and Directors, and to provide
incentives for such persons to exert maximum efforts for the success of the
Company.
 
     (c) The Company intends that the Stock Awards issued under the Plan shall,
in the discretion of the Committee to which responsibility for administration of
the Plan has been delegated pursuant to subsection 3(c), be either (i) Options
granted pursuant to Section 6 hereof, including Incentive Stock Options and
Nonqualified Stock Options, (ii) Rights to purchase restricted stock granted
pursuant to Section 7 hereof, or (iii) Stock Appreciation Rights granted
pursuant to Section 8 hereof. All Options shall be separately designated
Incentive Stock Options or Nonqualified Stock Options at the time of grant, and
shall be in such form as required pursuant to Section 6, and a separate
certificate (or certificates) will be issued for shares purchased upon exercise
of each type of Option. The Committee shall also determine whether the Stock
Awards issued under the Plan shall be performance-based for purposes of section
162(m) of the Internal Revenue Code of 1986, as amended.
 
2.  DEFINITIONS.
 
     (a) "Affiliate" means any subsidiary corporation of the Company, whether
now or hereafter existing, as those terms are defined in Sections 424(e) and (f)
respectively, of the Code.
 
     (b) "Board" means the Board of Directors of the Company.
 
     (c) "Code" means the Internal Revenue Code of 1986, as amended.
 
     (d) "Committee" means two or more Non-Employee Directors, unless otherwise
determined by the Board, who have been designated by the Board to act as the
Committee and who also qualify as Outside Directors.
 
     (e) "Company" means Unitrode Corporation, a corporation organized under the
laws of Maryland.
 
     (f) "Continuous Status as an Employee or Director" means the employment or
relationship as an Employee or Director is not interrupted or terminated by the
Company or any Affiliate. Either the Board or the Committee, in its sole
discretion, may determine whether Continuous Status as an Employee or Director
shall be considered interrupted in the case of: (i) any leave of absence
approved by the Board, including sick leave, military leave, or any other
personal leave; provided, however, that for purposes of Incentive Stock Options
and Stock Appreciation Rights appurtenant thereto, any such leave may not exceed
ninety (90) days, unless reemployment upon the expiration of such leave is
guaranteed by contract (including certain Company policies) or statute; or (ii)
transfers between locations of the Company or between the Company, Affiliates or
its successors.
 
     (g) "Director" means a member of the Board.
 
                                       A-1
<PAGE>   21
 
     (h) "Disability" means total and permanent disability as defined in Section
22(e)(3) of the Code.
 
     (i) "Effective Date" means the date that the Plan is approved by the
stockholders of the Company.
 
     (j) "Employee" means any person, including Officers and Directors, employed
by the Company or any Affiliate of the Company. Neither service as a Director
nor payment of a director's fee by the Company shall be sufficient to constitute
"employment" by the Company.
 
     (k) "Exchange Act" means the Securities Exchange Act of 1934, as amended.
 
     (l) "Fair Market Value" means, the mean between the high and low prices of
a share of the Company's Common Stock, $.01 per value per share, on the New York
Stock Exchange on the day previous to the grant date (or, if shares were not
traded on the day previous to such date, then on the next preceding trading day
during which a trade occurred);
 
     (m) "Incentive Stock Option" means an Option intended to qualify as an
incentive stock option within the meaning of Section 422 of the Code and the
regulations promulgated thereunder.
 
     (n) "Independent Stock Appreciation Right" or "Independent Right" means a
right granted under subsection 8(b)(iii) of the Plan.
 
     (o) "Non-Employee Director" means a Director who either (i) is not a
current Employee or Officer of the Company or its parent or subsidiary, does not
receive compensation (directly or indirectly) from the Company or its parent or
subsidiary for services rendered as a consultant or in any capacity other than
as a Director (except for an amount as to which disclosure would not be required
under Item 404(a) of Regulation S-K promulgated pursuant to the Securities Act
("Regulation S-K")), does not possess an interest in any other transaction as to
which disclosure would be required under Item 404(a) of Regulation S-K, and is
not engaged in a business relationship as to which disclosure would be required
under Item 404(b) of Regulation S-K; or (ii) is otherwise considered a
"non-employee director" for purposes of Rule 16b-3.
 
     (p) "Nonqualified Stock Option" means an Option not intended to qualify as
an Incentive Stock Option.
 
     (q) "Officer" means a person who is an officer of the Company within the
meaning of Section 16 of the Exchange Act and the rules and regulations
promulgated thereunder.
 
     (r) "Option" means a stock option granted pursuant to the Plan.
 
     (s) "Option Agreement" means a written agreement between the Company and an
Optionee evidencing the terms and conditions of an individual Option grant. Each
Option Agreement shall be subject to the terms and conditions of the Plan.
 
     (t) "Optionee" means an Employee or Director who holds an outstanding
Option.
 
     (u) "Outside Director" means a Director who either (i) is not a current
employee of the Company or an "affiliated corporation" (within the meaning of
Treasury regulations promulgated under Section 162(m) of the Code), is not a
former employee of the Company or an "affiliated corporation" receiving
compensation for prior services (other than benefits under a tax qualified
pension plan), was not an officer of the Company or an "affiliated corporation"
at any time, and is not currently receiving direct or indirect remuneration from
the Company or an "affiliated corporation" for services in any capacity other
than as a Director, or (ii) is otherwise considered an "outside director" for
purposes of Section 162(m) of the Code.
 
     (v) "Plan" means this Unitrode Corporation 1999 Equity Incentive Plan.
 
     (w) "Prior Plans" means the following stock option plans of the Company:
(i) the Unitrode Corporation 1992 Employee Stock Option Plan, as amended; (ii)
the BENCHMARQ Microelectronics, Inc. 1989 Stock Option Plan; (iii) the BENCHMARQ
Microelectronics, Inc. 1995 Flexible Stock Option Plan; and (iv) the Unitrode
Corporation Amended and Restated 1986 Non-Employee Director Option Plan.
 
     (x) "Rule 16b-3" means Rule 16b-3 of the Exchange Act or any successor to
Rule 16b-3, as in effect when discretion is being exercised with respect to the
Plan.
                                       A-2
<PAGE>   22
 
     (y) "Stock Appreciation Right" means any of the various types of rights
which may be granted under Section 8 of the Plan.
 
     (z) "Stock Award" means any right granted under the Plan, including, any
Option, any Stock Appreciation Right, or any right to purchase restricted stock.
 
     (aa) "Stock Award Agreement" means a written agreement between the Company
and a holder of a Stock Award evidencing the terms and conditions of an
individual Stock Award grant. Each Stock Award Agreement shall be subject to the
terms and conditions of the Plan.
 
     (bb) "Tandem Stock Appreciation Right" or "Tandem Right" means a right
granted under subsection 8(b)(i) of the Plan.
 
3.  ADMINISTRATION.
 
     (a) The Plan shall be administered by the Committee. The Board may abolish
the Committee at any time and revest in the Board the administration of the
Plan. Notwithstanding anything in this Section 3 to the contrary, at any time
the Committee may delegate to a committee of one or more members of the Board
the authority to grant Stock Awards to eligible persons who are not then subject
to Section 16 of the Exchange Act and to eligible persons with respect to whom
the Corporation does not wish to comply with Section 162(m) of the Code.
 
     (b) The Committee shall have the power, subject to, and within the
limitations of, the express provisions of the Plan:
 
          (1) To determine from time to time which of the persons eligible under
     the Plan shall be granted Stock Awards; when and how Stock Awards shall be
     granted; whether a Stock Award will be an Incentive Stock Option, a
     Nonqualified Stock Option, a right to purchase Restricted Stock, a Stock
     Appreciation Right, or a combination of the foregoing; the provisions of
     each Stock Award granted (which need not be identical), including the time
     or times when a person shall be permitted to receive stock pursuant to a
     Stock Award; whether a person shall be permitted to receive stock upon
     exercise of an Independent Stock Appreciation Right; and the number of
     shares with respect to which Stock Awards shall be granted to each such
     person.
 
          (2) To construe and interpret the Plan and Stock Awards granted under
     it, and to establish, amend and revoke rules and regulations for its
     administration.
 
          The Board or the Committee, in the exercise of this power, may correct
     any defect, omission or inconsistency in the Plan or in any Stock Award
     Agreement, in a manner and to the extent it shall deem necessary or
     expedient to make the Plan fully effective.
 
          (3) To amend the Plan or a Stock Award as provided in Section 14.
 
          (4) Generally, to exercise such powers and to perform such acts as the
     Committee deems necessary or expedient to promote the best interests of the
     Company and which are not in conflict with the provisions of the Plan.
 
4.  SHARES SUBJECT TO THE PLAN.
 
     Subject to the provisions of Section 13 relating to adjustments upon
changes in stock, the number of shares of stock that may be issued pursuant to
Stock Awards under the Plan shall be equal to 1,800,000 shares of the Company's
Common Stock, $.01 par value per share and any shares of stock available for
future awards under the Prior Plans as of the Effective Date. If any Stock Award
shall for any reason expire or otherwise terminate without having been exercised
in full, the stock not purchased shall again become available for issuance under
the Plan. Notwithstanding the foregoing, shares subject to Stock Appreciation
Rights exercised in accordance with Section 8 shall not be available for
subsequent issuance under the Plan.
 
                                       A-3
<PAGE>   23
 
5.  ELIGIBILITY.
 
     (a) Incentive Stock Options and Stock Appreciation Rights appurtenant
thereto may be granted only to Employees. Other Stock Awards may be granted to
Employees or Directors.
 
     (b) No person shall be eligible for the grant of an Incentive Stock Option
if, at the time of grant, such person owns (or is deemed to own pursuant to
Section 424(d) of the Code) stock possessing more than ten percent (10%) of the
total combined voting power of all classes of stock of the Company or of any of
its Affiliates unless the exercise price of such Incentive Stock Option is at
least one hundred ten percent (110%) of the Fair Market Value of such stock at
the date of grant and the Incentive Stock Option is not exercisable after the
expiration of five (5) years from the date of grant.
 
6.  OPTION PROVISIONS.
 
     Each Option shall be in such form and shall contain such terms and
conditions as the Committee shall deem appropriate. The provisions of separate
Options need not be identical, but each Option shall include (through
incorporation of provisions hereof by reference in the Option or otherwise) the
substance of each of the following provisions except as otherwise specifically
provided elsewhere in the Plan:
 
          (a) Term.  No Option shall be exercisable after the expiration of ten
     (10) years from the date it was granted.
 
          (b) Price.  Subject to subsection 5(b) above, the exercise price of
     each Incentive Stock Option and each Nonqualified Stock Option shall be set
     by the Committee at the time each option is granted, but shall be not less
     than one hundred percent (100%) of the Fair Market Value of the stock
     subject to the Option on the date the Option is granted.
 
          (c) Consideration.  The purchase price of stock acquired pursuant to
     an Option shall be paid, to the extent permitted by applicable statutes and
     regulations, either: (i) in cash at the time the Option is exercised, or
     (ii) at the discretion of the Board or the Committee, either at the time of
     the grant or exercise of the Option, (A) by delivery to the Company of
     other Common Stock of the Company, (B) according to a deferred payment or
     other arrangement (which may include, without limiting the generality of
     the foregoing, the use of other Common Stock of the Company) with the
     person to whom the Option is granted or to whom the Option is transferred
     pursuant to subsection 6(d), or (C) in any other form of legal
     consideration that may be acceptable to the Committee including delivery of
     a promissory note of the Optionee to the Company on terms determined by the
     Committee, which terms shall include a pledge of the stock so acquired.
 
          In the case of any deferred payment arrangement, interest shall be
     payable at least annually and shall be charged at the minimum rate of
     interest necessary to avoid the treatment as interest, under any applicable
     provisions of the Code, of any amounts other than amounts stated to be
     interest under the deferred payment arrangement.
 
          (d) Transferability.  An Incentive Stock Option shall not be
     transferable except by will or by the laws of descent and distribution, and
     shall be exercisable during the lifetime of the person to whom the
     Incentive Stock Option is granted only by such person. A Nonqualified Stock
     Option may be transferable to the extent specified in the Option Agreement,
     in which case the Option may be transferred upon such terms and conditions
     as are set forth in the Option Agreement, as the Committee shall determine
     in its sole discretion, including (without limitation) pursuant to a
     "domestic relations order" within the meaning of such rules, regulations or
     interpretation of the Securities and Exchange Commission as are applicable
     for purposes of Section 16 of the Exchange Act, or to family members, or to
     trusts or other entities maintained for the benefit of family members.
     Notwithstanding the foregoing, the person to whom an Option is granted may,
     by delivering written notice to the Company, in a form satisfactory to the
     Company, designate a third party who, in the event of the death of the
     Optionee, shall thereafter be entitled to exercise the Option.
 
                                       A-4
<PAGE>   24
 
          (e) Vesting.  The total number of shares of stock subject to an Option
     may, but need not, be allotted in periodic installments (which may, but
     need not, be equal). The Option Agreement may provide that from time to
     time during each of such installment periods, the Option may become
     exercisable ("vest") with respect to some or all of the shares allotted to
     that period, and may be exercised with respect to some or all of the shares
     allotted to such period and/or any prior period as to which the Option
     became vested but was not fully exercised. The Option may be subject to
     such other terms and conditions on the time or times when it may be
     exercised (which may be based on performance or other criteria) as the
     Committee may deem appropriate. During the remainder of the term of the
     Option (if its term extends beyond the end of the installment periods), the
     Option may be exercised from time to time with respect to any shares then
     remaining subject to the Option. The provisions of this subsection 6(e) are
     subject to any Option provisions governing the minimum number of shares as
     to which an Option may be exercised.
 
          (f) Securities Law Compliance.  The Company may require any Optionee,
     or any person to whom an Option is transferred under subsection 6(d), as a
     condition of exercising any such Option, (1) to give written assurances
     satisfactory to the Company as to the Optionee's knowledge and experience
     in financial and business matters and/or to employ a purchaser
     representative reasonably satisfactory to the Company who is knowledgeable
     and experienced in financial and business matters, and that he or she is
     capable of evaluating, alone or together with the purchaser representative,
     the merits and risks of exercising the Option; and (2) to give written
     assurances satisfactory to the Company stating that such person is
     acquiring the stock subject to the Option for such person's own account and
     not with any present intention of selling or otherwise distributing the
     stock. These requirements, and any assurances given pursuant to such
     requirements, shall be inoperative if (i) the issuance of the shares upon
     the exercise of the Option has been registered under a then currently
     effective registration statement under the Securities Act of 1933, as
     amended (the "Securities Act"), or (ii) as to any particular requirement, a
     determination is made by counsel for the Company that such requirement need
     not be met in the circumstances under the then applicable securities laws.
 
          (g) Individual Dollar Limitation.  In the case of an Incentive Stock
     Option, the aggregate fair market value (determined at the time such Option
     is granted) of the Common Stock with respect to which an Incentive Stock
     Option is exercisable for the first time by an Optionee during any calendar
     year (whether under this Plan or another plan of the Company or any
     affiliate) shall not exceed $100,000 (or such other limit as may be in
     effect under the Code on the date of exercise).
 
          (h) Termination of Employment or Relationship as a Director.  In the
     event an Optionee's Continuous Status as an Employee or Director terminates
     (other than upon the Optionee's death or disability), the Optionee may
     exercise his or her Option, but only within such period of time ending on
     the earlier of (i) the date three (3) months after termination of the
     Optionee's Continuous Status as an Employee or Director (or such longer or
     shorter period of time specified in the Option Agreement), or (ii) the
     expiration of the Option's term, and only to the extent that the Optionee
     was entitled to exercise it at the date of termination (but in no event
     later than the expiration of the term of such Option as set forth in the
     Option Agreement). If, at the date of termination, the Optionee is not
     entitled to exercise his or her entire Option, the shares covered by the
     unexercisable portion of the Option shall revert to and again become
     available for issuance under the Plan. If, after termination, the Optionee
     does not exercise his or her Option within the time specified in the Option
     Agreement, the Option shall terminate, and the shares covered by such
     Option shall revert to the Plan.
 
          An Optionee's Option Agreement may also provide that if the exercise
     of the Option following the termination of the Optionee's Continuous Status
     as an Employee or Director (other than upon the Optionee's death or
     disability) would result in liability under Section 16(b) of the Exchange
     Act, then the Option shall terminate on the earlier of (i) the expiration
     of the term of the Option set forth in the Option Agreement, or (ii) the
     tenth (10th) day prior to the first date on which such exercise would
     result in such liability under Section 16(b) of the Exchange Act. Finally,
     an Optionee's Option Agreement may also provide that if the exercise of the
     Option following the termination of the Optionee's Continuous Status as an
     Employee or Director (other than upon the Optionee's death or disability)
     would be
                                       A-5
<PAGE>   25
 
     prohibited at any time solely because the issuance of shares would violate
     the registration requirements under the Act, then the Option shall
     terminate on the earlier of (i) the expiration of the term of the Option
     set forth in the first paragraph of this subsection 6(g), or (ii) the
     expiration of a period of three (3) months after the termination of the
     Optionee's Continuous Status as an Employee or Director during which the
     exercise of the Option would not be in violation of such registration
     requirements.
 
          (i) Disability of Optionee.  In the event an Optionee's Continuous
     Status as an Employee or Director terminates as a result of the Optionee's
     disability, the Optionee may exercise his or her Option, but only within
     such period of time ending on the earlier of (i) the date twelve (12)
     months following such termination (or such longer or shorter period of time
     as specified in the Option Agreement), or (ii) the expiration of the term
     of the Option as set forth in the Option Agreement). If, at the date of
     termination, the Optionee is not entitled to exercise his or her entire
     Option, the shares covered by the unexercisable portion of the Option shall
     revert to the Plan. If, after termination, the Optionee does not exercise
     his or her Option within the time specified herein, the Option shall
     terminate, and the shares covered by such Option shall revert to and again
     become available for issuance under the Plan.
 
          (j) Death of Optionee.  In the event of the death of an Optionee
     during, or within a period specified in the Option Agreement after the
     termination of, the Optionee's Continuous Status as an Employee or
     Director, the Option may be exercised by the Optionee's estate, by a person
     who acquired the right to exercise the Option by bequest or inheritance, or
     by a person designated to exercise the option upon the Optionee's death
     pursuant to subsection 6(d), but only within the period ending on the
     earlier of (i) the date twelve (12) months following the date of death (or
     such longer or shorter period specified in the Option Agreement) or (ii)
     the expiration of the term of such Option as set forth in the Option
     Agreement. If, at the time of death, the Optionee was not entitled to
     exercise his or her entire Option, the shares covered by the unexercisable
     portion of the Option shall revert to and again become available under the
     Plan. If, after death, the Option is not exercised within the time
     specified herein, the Option shall terminate, and the shares covered by
     such Option shall revert to and again become available for issuance under
     the Plan.
 
          (k) Withholding.  To the extent provided by the terms of an Option
     Agreement, the Optionee may satisfy any federal, state or local tax
     withholding obligation relating to the exercise of such Option by any of
     the following means or by a combination of such means: (1) tendering a cash
     payment; (2) authorizing the Company to withhold shares from the shares of
     the Common Stock otherwise issuable to the participant as a result of the
     exercise of the Option; or (3) delivering to the Company owned and
     unencumbered shares of the Common Stock of the Company.
 
          (l) Re-Load Options.  Without in any way limiting the authority of the
     Committee to make or not to make grants of Options hereunder, the Committee
     shall have the authority (but not an obligation) to include as part of any
     Option Agreement a provision entitling the Optionee to a further Option (a
     "Re-Load Option") in the event the Optionee exercises the Option evidenced
     by the Option agreement, in whole or in part, by surrendering other shares
     of Common Stock in accordance with this Plan and the terms and conditions
     of the Option Agreement. Any such Re-Load Option (i) shall be for a number
     of shares equal to the number of shares surrendered as part or all of the
     exercise price of such Option, (ii) shall have an expiration date which is
     the same as the expiration date of the Option the exercise of which gave
     rise to such Re-Load Option; and (iii) shall have an exercise price which
     is equal to one hundred percent (100%) of the Fair Market Value of the
     Common Stock subject to the Re-Load Option on the date of exercise of the
     original Option or, in the case of a Re-Load Option which is an Incentive
     Stock Option and which is granted to a 10% stockholder (as described in
     subsection 5(c)), shall have an exercise price which is equal to one
     hundred ten percent (110%) of the Fair Market Value of the stock subject to
     the Re-Load Option on the date of exercise of the original Option and shall
     have a term which is no longer than five (5) years.
 
          Any such Re-Load Option may be an Incentive Stock Option or a
     Nonqualified Stock Option, as the Committee may designate at the time of
     the grant of the original Option, provided, however, that the designation
     of any Re-Load Option as an Incentive Stock Option shall be subject to the
     one hundred
 
                                       A-6
<PAGE>   26
 
     thousand dollar ($100,000) annual limitation on exercisability of Incentive
     Stock Options described in subsection 6(g) of the Plan and in Section
     422(d) of the Code. There shall be no Re-Load Options on a Re-Load Option.
     Any such Re-Load Option shall be subject to the availability of sufficient
     shares under subsection 4(a) and shall be subject to such other terms and
     conditions as the Committee may determine which are not inconsistent with
     the express provisions of the Plan regarding the terms of the Options.
 
7.  TERMS OF PURCHASES OF RESTRICTED STOCK.
 
     Each restricted stock purchase agreement shall be in such form and shall
contain such terms and conditions as the Committee shall deem appropriate. The
terms and conditions of restricted stock purchase agreements may change from
time to time, and the terms and conditions of separate agreements need not be
identical. Each restricted stock purchase agreement shall include (through
incorporation of provisions herein by reference in the agreement or otherwise)
the substance of each of the following provisions as appropriate:
 
          (a) Purchase Price.  The purchase price under each restricted stock
     purchase agreement shall be such amount as the Committee shall determine
     and designate in such agreement.
 
          (b) Transferability.  Except as otherwise provided elsewhere in the
     Plan, no rights under a restricted stock purchase agreement shall be
     assignable by any participant under the Plan, either voluntarily or by
     operation of law, except by will or by the laws of descent and
     distribution, and shall be exercisable during the lifetime of the person to
     whom the rights are granted only by such person. The person to whom the
     Stock Award is granted, may, by delivering written notice to the Company,
     in a form satisfactory to the Company, designate a third party who, in the
     event of the death of such person, shall thereafter be entitled to exercise
     the rights held by such person under the restricted stock purchase
     agreement.
 
          (c) Consideration.  The purchase price of stock acquired pursuant to a
     stock purchase agreement shall be paid either: (i) in cash at the time of
     purchase; (ii) at the discretion of the Committee, according to a deferred
     payment or other arrangement with the person to whom the stock is sold; or
     (iii) in any other form of legal consideration that may be acceptable to
     the Committee in its discretion; including delivery of a promissory note of
     the person to whom the stock is sold to the Company on terms determined by
     the Committee, which terms shall include the pledge of the stock so
     purchased.
 
          (d) Vesting.  Shares of stock sold under the Plan shall be subject to
     a repurchase option in favor of the Company in accordance with a vesting
     schedule to be determined by the Committee.
 
          (e) Termination of Employment or Relationship as a Director.  In the
     event a Participant's Continuous Status as an Employee or Director
     terminates, the Company shall repurchase or otherwise reacquire any or all
     of the shares of stock held by that person which have not vested as of the
     date of termination under the terms of the restricted stock purchase
     agreement between the Company and such person.
 
8.  STOCK APPRECIATION RIGHTS.
 
     (a) The Committee shall have full power and authority, exercisable in its
sole discretion, to grant Stock Appreciation Rights to Employees or Directors of
the Company or its Affiliates under the Plan. Each such right shall entitle the
holder to a distribution based on the appreciation in the Fair Market Value per
share of a designated amount of stock.
 
     (b) Two types of Stock Appreciation Rights shall be authorized for issuance
under the Plan:
 
          (1) Tandem Stock Appreciation Rights.  Tandem Rights will be granted
     appurtenant to an Option and will require the holder to elect between the
     exercise of the underlying Option for shares of stock or the surrender, in
     whole or in part, of such Option for an appreciation distribution equal to
     the excess of (A) the Fair Market Value (on the date of Option surrender)
     of vested shares of stock purchasable under the surrendered Option over (B)
     the aggregate exercise price payable for such shares.
 
                                       A-7
<PAGE>   27
 
          (2) Independent Stock Appreciation Rights.  Independent Rights may be
     granted independently of any Option and will entitle the holder upon
     exercise to an appreciation distribution equal in amount to the excess of
     (A) the aggregate Fair Market Value (at date of exercise) of a number of
     shares of stock equal to the number of vested share equivalents exercised
     at such time (as described in subsection 7(c)(iii)) over (B) the aggregate
     Fair Market Value of such number of shares of stock at the date of grant.
 
     (c) The terms and conditions applicable to each Tandem Right and
Independent Right shall be as follows:
 
          (1) Tandem Rights
 
             (i) Tandem Rights may be tied to either Incentive Stock Options or
        Nonqualified Stock Options. Each such right shall, except as
        specifically set forth below, be subject to the same terms and
        conditions applicable to the particular Option to which it pertains. If
        Tandem Rights are granted appurtenant to an Incentive Stock Option, they
        shall satisfy any applicable Treasury Regulations so as not to
        disqualify such Option as an Incentive Stock Option under the Code.
 
             (ii) The appreciation distribution payable on the exercised Tandem
        Right shall be in cash in an amount equal to the excess of (I) the Fair
        Market Value (on the date of the Option surrender) of the number of
        shares of stock covered by that portion of the surrendered Option in
        which the optionee is vested over (II) the aggregate exercise price
        payable for such vested shares.
 
          (2) Independent Rights.
 
             (i) Independent Rights shall, except as specifically set forth
        below, be subject to the same terms and conditions applicable to
        Nonqualified Stock Options as set forth in Section 6. They shall be
        denominated in share equivalents.
 
             (ii) The appreciation distribution payable on the exercised
        Independent Right shall be in cash in an amount equal to the excess of
        (I) the aggregate Fair Market Value (on the date of the exercise of the
        Independent Right) of a number of shares of Company stock equal to the
        number of share equivalents in which the holder is vested under such
        Independent Right, and with respect to which the holder is exercising
        the Independent Right on such date, over (II) the aggregate Fair Market
        Value (on the date of the grant of the Independent Right) of such number
        of shares of Company stock.
 
          (3) Terms Applicable to Tandem Rights and Independent Rights.
 
             (i) To exercise any outstanding Tandem or Independent Right, the
        holder must provide written notice of exercise to the Company in
        compliance with the provisions of the instrument evidencing such right.
 
             (ii) If a Tandem or Independent Right is granted to an individual
        who is at the time subject to Section 16(b) of the Exchange Act (a
        "Section 16(b) Insider"), then the instrument of grant shall incorporate
        all the terms and conditions at the time necessary to assure that the
        subsequent exercise of such right shall qualify for the safe-harbor
        exemption from short-swing profit liability provided by Rule 16b-3
        promulgated under the Exchange Act (or any successor rule or
        regulation).
 
             (iii) Except as otherwise provided in this section, no limitation
        shall exist on the aggregate amount of cash payments the Company may
        make under the Plan in connection with the exercise of Tandem or
        Independent Rights.
 
9.  CANCELLATION AND RE-GRANT OF OPTIONS.
 
     (a) The Committee shall have the authority to effect, at any time and from
time to time, with the consent of the affected holders of Options and/or Stock
Appreciation Rights, (i) the repricing of any outstanding Options and/or any
Stock Appreciation Rights under the Plan and the grant in substitution therefor
of new Options and/or Stock Appreciation Rights under the Plan covering the same
or different numbers of shares of stock, but having an exercise price per share
not less than 100% of the Fair Market Value
                                       A-8
<PAGE>   28
 
in the case of an Incentive Stock Option or, in the case of an Incentive Stock
Option granted to a 10% stockholder (as described in subsection 5(c), not less
than one hundred ten percent (110%) of the Fair Market Value) per share of stock
on the new grant date. Notwithstanding the foregoing, the Committee may grant an
Option and/or Stock Appreciation Right with an exercise price lower than that
set forth above if such Option and/or Stock Appreciation Right is granted as
part of a transaction to which section 424(a) of the Code applies.
 
     (b) Shares subject to an Option or Stock Appreciation Right canceled under
this Section 9 shall continue to be counted against the maximum Stock Award
permitted to be granted to a person pursuant to subsection 5(c). The repricing
of an Option and/or Stock Appreciation Right under this Section 9, resulting in
a reduction of the exercise price, shall be deemed to be a cancellation of the
original Option and/or Stock Appreciation Right and the grant of a substitute
Option and/or Stock Appreciation Right; in the event of such repricing, both the
original and the substituted Options and Stock Appreciation Rights shall be
counted against the maximum Stock Award permitted to be granted to a person
pursuant to subsection 5(c). The provisions of this subsection 9(b) shall be
applicable only to the extent required by Section 162(m) of the Code.
 
10.  COVENANTS OF THE COMPANY.
 
     (a) During the terms of the Stock Awards, the Company shall keep available
at all times the number of shares of Common Stock required to satisfy such Stock
Awards up to the number of shares of Common Stock authorized under the Plan.
 
     (b) The Company shall seek to obtain from each regulatory commission or
agency having jurisdiction over the Plan such authority as may be required to
issue and sell shares of stock under the Stock Awards; provided, however, that
this undertaking shall not require the Company to register under the Securities
Act either the Plan, any Stock Award or any stock issued or issuable pursuant to
any such Stock Award. If, after reasonable efforts, the Company is unable to
obtain from any such regulatory commission or agency the authority which counsel
for the Company deems necessary for the lawful issuance and sale of stock under
the Plan, the Company shall be relieved from any liability for failure to issue
and sell stock under such Stock Awards unless and until such authority is
obtained.
 
11.  USE OF PROCEEDS FROM STOCK.
 
     Proceeds from the sale of stock pursuant to Stock Awards shall constitute
general funds of the Company.
 
12.  MISCELLANEOUS.
 
     (a) The Committee shall have the power to accelerate the time at which a
Stock Award may first be exercised or the time during which a Stock Award or any
part thereof will vest, notwithstanding the provisions in the Stock Award
stating the time at which it may first be exercised or the time during which it
will vest.
 
     (b) Neither an Optionee nor any person to whom an Option is transferred
under subsection 6(d) shall be deemed to be the holder of, or to have any of the
rights of a holder with respect to, any shares subject to such Option unless and
until such person has satisfied all requirements for exercise of the Option
pursuant to its terms.
 
     (c) Nothing in the Plan or any instrument executed or Stock Award granted
pursuant thereto shall confer upon any Employee, Director, Optionee, or other
holder of Stock Awards any right to continue in the employ of the Company or any
Affiliate (or to continue acting as a Director) or shall affect the right of the
Company or any Affiliate to terminate the employment or relationship as a
Director of any Employee, Director or Optionee, with or without cause.
 
     (d) To the extent that the aggregate Fair Market Value (determined at the
time of grant) of stock with respect to which Incentive Stock Options are
exercisable for the first time by any Optionee during any calendar year under
all plans of the Company and its Affiliates exceeds one hundred thousand dollars
 
                                       A-9
<PAGE>   29
 
($100,000), the Options or portions thereof which exceed such limit (according
to the order in which they were granted) shall be treated as Nonqualified Stock
Options.
 
13.  ADJUSTMENTS UPON CHANGES IN STOCK.
 
     (a) If any change is made in the stock subject to the Plan, or subject to
any Stock Award, without receipt of consideration by the Company (through
merger, consolidation, reorganization, recapitalization, reincorporation, stock
dividend, dividend in property other than cash, stock split, liquidating
dividend, combination of shares, exchange of shares, change in corporate
structure or other transaction not involving the receipt of consideration by the
Company), the Plan will be appropriately adjusted in the class(es) and maximum
number of shares subject to the Plan pursuant to subsection 4(a) and the maximum
number of shares subject to options and Stock Appreciation Rights pursuant to
subsection 5(c), and the outstanding Stock Awards will be appropriately adjusted
in the class(es) and number of shares and price per share of stock subject to
such outstanding Stock Awards. Such adjustments shall be made by the Committee,
the determination of which shall be final, binding and conclusive. (The
conversion of any convertible securities of the Company shall not be treated as
a "transaction not involving the receipt of consideration by the Company.")
 
     (b) In the event of: (1) a dissolution, liquidation or sale of
substantially all of the assets of the Company; (2) a merger or consolidation in
which the Company is not the surviving corporation; or (3) a reverse merger in
which the Company is the surviving corporation but the shares of the Company's
common stock outstanding immediately preceding the merger are converted by
virtue of the merger into other property, whether in the form of securities,
cash or otherwise, then, at the sole discretion of the Board and to the extent
permitted by applicable law: (i) any surviving corporation or an Affiliate of
such surviving corporation shall assume any Stock Awards for those outstanding
under the Plan, or (ii) such Stock Awards shall continue in full force and
effect. In the event any surviving corporation and its Affiliates refuse to
assume or continue such Stock Awards, or to substitute similar Stock Awards for
those outstanding under the Plan, then, at the sole discretion of the Board, and
with respect to Stock Awards held by persons then performing services as
Employees or Directors, the time during which all such Stock Awards may be
exercised shall be accelerated and the Stock Awards terminated if not exercised
prior to such event.
 
14.  AMENDMENT OF THE PLAN AND STOCK AWARDS.
 
     (a) The Committee at any time, and from time to time, may amend, suspend or
terminate the Plan. However, except as provided in Section 13 relating to
adjustments upon changes in stock, no amendment shall be effective unless
approved by the stockholders of the Company, to the extent stockholder approval
is required for the Plan to satisfy the provisions of Sections 162(m) and 422 of
the Code and the regulations promulgated thereunder, Rule 16b-3 under the
Exchange Act or New York Stock Exchange listing requirements.
 
     (b) It is expressly contemplated that the Committee may amend the Plan in
any respect the Committee deems necessary or advisable to provide Optionees with
the maximum benefits provided or to be provided under the provisions of the Code
and the regulations promulgated thereunder relating to Incentive Stock Options
and/or to bring the Plan and/or Incentive Stock Options granted under it into
compliance therewith.
 
     (c) Rights and obligations under any Stock Award granted before amendment
of the Plan shall not be altered or impaired by any amendment of the Plan unless
(i) the Company requests the consent of the person to whom the Stock Award was
granted and (ii) such person consents in writing.
 
     (e) The Committee at any time, and from time to time, may amend the terms
of any one or more Stock Awards; provided, however, that the rights and
obligations under any Stock Award shall not be altered or impaired by any such
amendment unless (i) the Company requests the consent of the person to whom the
Stock Award was granted and (ii) such person consents in writing.
 
                                      A-10
<PAGE>   30
 
15.  TERMINATION OR SUSPENSION OF THE PLAN.
 
     (a) The Board may suspend or terminate the Plan at any time. Unless sooner
terminated, the Plan shall terminate on June 8, 2009. No Stock Awards may be
granted under the Plan while the Plan is suspended or after it is terminated.
 
     (b) Rights and obligations under any Stock Award granted while the Plan is
in effect shall not be impaired by suspension or termination of the Plan, except
with consent of the person to whom the Stock Award was granted.
 
16.  GOVERNING LAW.
 
     The provisions of the Plan and all Stock Awards made hereunder shall be
governed by and interpreted in accordance with the laws of the State of Maryland
without regard to any applicable conflicts of law.
 
                                            Adopted by the Board of Directors on
 
                                            ------------------------------------
 
                                            Approved by the Company's
                                            Stockholders on
 
                                            ------------------------------------
 
                                      A-11
<PAGE>   31
 
                                                                      APPENDIX B
 
                              UNITRODE CORPORATION
 
                       1999 EMPLOYEE STOCK PURCHASE PLAN
 
                              ARTICLE I -- PURPOSE
 
1.01  PURPOSE
 
     The Unitrode Corporation Employee Stock Purchase Plan ("the Plan") is
intended to provide a method whereby employees of Unitrode Corporation and its
subsidiary corporations (hereinafter referred to, unless the context otherwise
requires, as the "Company") who are residents of the United States will have an
opportunity to acquire a proprietary interest in the Company through the
purchase of shares of the Common Stock of the Company. It is the intention of
the Company to have the Plan qualify as an "employee stock purchase plan" under
sec.423 of the Internal Revenue Code of 1986, as amended (the "Code"). The
provisions of the Plan shall be construed so as to extend and limit
participation in a manner consistent with the requirements of that section of
the Code.
 
                           ARTICLE II -- DEFINITIONS
 
2.01  BASE PAY
 
     "Base Pay" shall mean regular straight-time earnings including disability
pay, but excluding payments for overtime, shift premium, bonuses and other
special payments, commissions and other marketing incentive payments.
 
2.02.  COMMITTEE
 
     "Committee" shall mean the individuals described in Article XI.
 
2.03.  EMPLOYEE
 
     "Employee" means any person working for the Company in the United States
who is customarily employed on a regular full-time or part-time basis by the
Company and is regularly scheduled to work more than 20 hours per week. Interns,
co-operative students, temporary contract service providers and consultants
shall not be considered Employees for purposes of the Plan.
 
2.04.  SUBSIDIARY CORPORATION
 
     "Subsidiary Corporation" shall mean any present or future corporation which
(i) would be a "subsidiary corporation" of Unitrode Company as that term is
defined in sec.424 of the Code and (ii) is designated as a participant in the
Plan by the Committee.
 
                  ARTICLE III -- ELIGIBILITY AND PARTICIPATION
 
3.01.  ELIGIBILITY
 
     Any Employee shall be eligible to participate in the next available
Offering Period under the Plan occurring after such Employee's date of hire or
rehire.
 
3.02.  LEAVE OF ABSENCE
 
     For purposes of participation in the Plan, an Employee on a paid leave of
absence shall be deemed to be an eligible Employee for the first 90 days of such
paid leave of absence. Such Employee's eligibility to participate in the Plan
and the right to exercise any option shall be deemed to have terminated at the
close of business on such 90th day. Upon return from paid leave of absence, an
Employee will again be eligible for participation in the Plan and may
participate in the next available Offering Period occurring under the Plan
following such Employee's date of return.
 
                                       B-1
<PAGE>   32
 
3.03 RESTRICTIONS ON PARTICIPATION
 
     Notwithstanding any provisions of the Plan to the contrary, no Employee
shall be granted an option under the Plan:
 
          (a) if, immediately after the purchase of shares under the Plan, such
     Employee would own stock, and/or hold outstanding options to purchase
     stock, possessing 5% or more of the total combined voting power or value of
     all classes of stock of the Company (for purposes of this paragraph, the
     rules of sec.424(d) of the Code shall apply in determining stock ownership
     of any employee); or
 
          (b) which would enable an Employee to purchase in excess of 1000
     shares of the Company's common stock during any one Offering Period under
     the Plan.
 
          (c) which permits such Employee's rights to purchase stock under the
     Plan to accrue at a rate which exceeds $25,000 in fair market value of the
     stock (determined at the time such option is granted) for each calendar
     year in which such option is outstanding.
 
3.04.  COMMENCEMENT OF PARTICIPATION
 
     An eligible Employee may become a participant by completing an
authorization for a payroll deduction on the form provided by the Company and
filing it with the Company on or before the date set therefor by the Committee,
which date shall be prior to the Offering Commencement Date for the Offering (as
such terms are defined below). Payroll deductions for a participant shall
commence on the applicable Offering Commencement Date when the participant's
authorization for a payroll deduction becomes effective and shall continue in
effect for the initial and all subsequent offerings unless terminated by the
participant as provided in Article VIII.
 
                            ARTICLE IV -- OFFERINGS
 
4.01  OFFERINGS
 
     The Plan will be implemented by offerings of the Company's Common Stock
(the "Offerings") beginning on the 1st day of January and the 1st day of July in
each year, each Offering terminating on June 30 and December 31 of that year.
 
     As used in the Plan, "Offering Commencement Date" means the January 1 or
July 1, as the case may be, on which the particular Offering begins and
"Offering Termination Date" means the June 30 or December 31 as the case may be,
on which the particular Offering terminates. The first Offering hereunder shall
commence on July 1, 1999.
 
                        ARTICLE V -- PAYROLL DEDUCTIONS
 
5.01.  AMOUNT OF DEDUCTION
 
     At the time a participant files his authorization for post-tax payroll
deduction, he shall elect to have deductions made from his pay on each payday
during the time he is a participant in an Offering at the rate of 1, 2, 3, 4, 5,
6, 7, 8, 9, or 10% of his Base Pay in effect at the Offering Commencement Date
of such Offering. Such rate may be changed prior to any subsequent offering in
accordance with procedures established by the Committee. In the case of a
part-time hourly Employee, such Employee's Base Pay during an Offering shall be
determined by multiplying such Employee's hourly rate of pay in effect on the
Offering Commencement Date by the number of regularly scheduled hours of work
for such Employee during such Offering.
 
5.02.  PARTICIPANT'S ACCOUNT
 
     All payroll deductions made for a participant shall be credited to his
account under the Plan.
 
5.03.  CHANGES IN PAYROLL DEDUCTIONS
 
     A participant may discontinue his participation in the Plan as provided in
Article VIII and can reduce contributions once during the Offering in accordance
with procedures established by the Committee. No other change can be made during
an Offering.
 
                                       B-2
<PAGE>   33
 
5.04.  LEAVE OF ABSENCE
 
     If a participant goes on a paid leave of absence, such participant shall
have the right to elect: (a) to withdraw the balance in his or her account
pursuant to sec.7.02, (b) to discontinue contributions to the Plan but remain a
participant in the Plan, or (c) remain a participant in the Plan during such
leave of absence, as outlined in Article III sec.3.02.
 
                        ARTICLE VI -- GRANTING OF OPTION
 
6.01.  NUMBER OF OPTION SHARES
 
     On the Commencement Date of each Offering, a participating Employee shall
be deemed to have been granted an option to purchase a maximum number of shares
of the stock of the Company equal to an amount determined as follows: an amount
equal to (i) that percentage of the Employee's Base Pay which he has elected to
have withheld (but not in any case in excess of 10%) multiplied by (ii) the
Employee's Base Pay during the period of the offering (iii) divided by 85% of
the market value of the stock of the Company on the applicable Offering
Commencement Date. Notwithstanding the foregoing, the maximum number of shares
any Employee may purchase during any Offering shall be limited to 1000 shares.
The market value of the Company's stock shall be determined as provided in
paragraphs (a) and (b) of sec.6.02 below. An Employee's Base Pay during the
period of an offering shall be determined by multiplying his normal weekly or
hourly rate of pay (as in effect on the last day prior to the Commencement Date
of the particular offering) by 26 or 1040, as the case may be, provided that, in
the case of a part time hourly Employee, the Employee's Base Pay during the
period of an offering shall be determined by multiplying such Employee's hourly
rate by the number of regularly scheduled hours of work for such Employee during
such Offering.
 
6.02.  OPTION PRICE
 
     The option price of stock purchased with payroll deductions made during
such annual offering for a participant therein shall be the lower of:
 
          (a) 85% of the closing price of the stock on the Offering Commencement
     Date or the nearest prior business day on which trading occurred on the New
     York Stock Exchange; or
 
          (b) 85% of the closing price of the stock on the Offering Termination
     Date or the nearest prior business day on which trading occurred on the New
     York Stock Exchange. If the Common Stock of the Company is not admitted to
     trading on any of the aforesaid dates for which closing prices of the stock
     are to be determined, then reference shall be made to the fair market value
     of the stock on that date, as determined on such basis as shall be
     established or specified for the purpose by the Committee.
 
                       ARTICLE VII -- EXERCISE OF OPTION
 
7.01  AUTOMATIC EXERCISE
 
     Unless a participant gives written notice to the Company as hereinafter
provided, his option for the purchase of stock with payroll deductions made
during any offering will be deemed to have been exercised automatically on the
Offering Termination Date applicable to such offering, for the purchase of the
number of full shares of stock which the accumulated payroll deductions in his
account at that time will purchase at the applicable option price (but not in
excess of the number of shares for which options have been granted to the
Employee pursuant to sec.6.01), and any excess in his account at that time will
be carried over to the next offering if his participation in the plan continues.
 
7.02  WITHDRAWAL OF ACCOUNT
 
     By written notice to the Company, at any time prior to the Offering
Termination Date applicable to any Offering, a participant may elect to withdraw
all the accumulated payroll deductions in his account at such time.
 
                                       B-3
<PAGE>   34
 
7.03  FRACTIONAL SHARES
 
     Fractional shares will not be issued under the Plan and any accumulated
payroll deductions which would have been used to purchase fractional shares will
be carried over to the next offering if his participation in the plan continues.
 
7.04  TRANSFERABILITY OF OPTION
 
     During a participant's lifetime, options held by such participant shall be
exercisable only by that participant, or following a participant's death, only
by the participant's named beneficiary or legal representative, as applicable.
 
7.05  DELIVERY OF STOCK
 
     As promptly as practicable after the Offering Termination Date of each
Offering, the Company will deliver to each participant, as appropriate, the
stock purchased upon exercise of his option.
 
                           ARTICLE VIII -- WITHDRAWAL
 
8.01  IN GENERAL
 
     As indicated in sec.7.02, a participant may withdraw payroll deductions
credited to his account under the Plan at any time prior to an offering
Termination Date by giving written notice to the Company. All of the
participant's payroll deductions credited to his account will be paid to him
promptly after receipt of his notice of withdrawal, and no further payroll
deductions with be made from his pay during such Offering. The Company may, at
its option, treat any attempt to borrow by an Employee on the security of his
accumulated payroll deductions as an election, under sec.3.02, to withdraw such
deductions.
 
8.02  EFFECT ON SUBSEQUENT PARTICIPATION
 
     A participant's withdrawal from any Offering will not have any effect upon
his eligibility to participate in any succeeding Offering or in any similar plan
which may hereafter be adopted by the Company.
 
8.03  TERMINATION OF EMPLOYMENT
 
     Upon termination of the participant's employment for any reason, including
retirement (but excluding death while in the employ of the Company or
continuation of a leave of absence for a period beyond 90 days), the payroll
deductions credited to his account will be returned to him, or, in the case of
his death subsequent to the termination of his employment, to the person or
persons entitled thereto under sec.12.01. For purposes of this Section, salary
continuation following termination of employment shall not be considered
continued employment.
 
8.04  TERMINATION OF EMPLOYMENT DUE TO DEATH
 
     Upon termination of the participant's employment because of his death, his
beneficiary (as defined in sec.12.01) shall have the right to elect, by written
notice given to the Company prior to the earlier of the Offering Termination
Date or the expiration of a period of sixty (60) days commencing with the date
of the death of the participant, either: (a) to withdraw all of the payroll
deductions credited to the participant's account under the Plan, or (b) to
exercise the participant's option for the purchase of stock on the Offering
Termination Date next following the date of the participant's death for the
purchase of the number of full shares of stock which the accumulated payroll
deductions in the participant's account at the date of the participant's death
will purchase at the applicable option price, and any excess in such account
will be returned to said beneficiary. In the event that no such written notice
of election shall be duly received by the Company, the beneficiary shall
automatically be deemed to have elected, pursuant to paragraph (b), to exercise
the participant's option.
 
8.05  LEAVE OF ABSENCE
 
     A participant on leave of absence shall, subject to the election made by
such participant pursuant to sec.5.04, continue to be a participant in the Plan
so long as such participant is on continuous leave of absence. A participant who
has been on leave of absence for more than 90 days and who therefore is not an
employee for
 
                                       B-4
<PAGE>   35
 
the purpose of the Plan shall not be entitled to participate in any offering
commencing after the 90th day of such leave of absence. Notwithstanding any
other provisions of the Plan unless a participant on leave of absence returns to
regular full time or part time employment with the Company at the earlier of:
(a) the termination of such leave of absence or (b) three months from the 90th
day of such leave of absence, such participant's participation in the plan shall
terminate on whichever of such dates first occurs.
 
                             ARTICLE IX -- INTEREST
 
9.01  NO PAYMENT OF INTEREST
 
     No interest will be paid or allowed on any money paid into the Plan or
credited to the account of any participant Employee.
 
                               ARTICLE X -- STOCK
 
10.01  MAXIMUM SHARES
 
     The maximum number of shares which shall be issued under the Plan, subject
to adjustment upon changes in capitalization of the Company as provided in
sec.12.04 shall be 200,000 shares. If the total number of shares for which
options are exercised on any Offering Termination Date in accordance with
Article VI exceeds the maximum number of shares then available for issuance
under the Plan, the Company shall make a pro rata allocation of the shares
available for delivery and distribution in as nearly a uniform manner as shall
be practicable and as it shall determine to be equitable, and the balance of
payroll deductions credited to the account of each participant under the Plan
shall be returned to him as promptly as possible or shall be carried over to the
next offering for those participants continuing participation herein.
 
10.02  PARTICIPANT'S INTEREST IN OPTION STOCK
 
     The participant will have no interest in stock covered by his option until
such option has been exercised.
 
10.03  REGISTRATION OF STOCK
 
     Stock to be delivered to a participant under the Plan will be registered in
the name of the participant, or, if the participant so directs by written notice
to the Secretary of the Company prior to the Offering Termination Date
applicable thereto, in the names of the participant and one such other person as
may be designated by the participant, as joint tenants with rights of
survivorship or as tenants by the entireties, to the extent permitted by
applicable law.
 
10.04  RESTRICTIONS ON EXERCISE
 
     The Board of Directors may, in its discretion, require as conditions to the
exercise of any option that the shares of Common Stock reserved for issuance
upon the exercise of the option shall have been duly listed, upon official
notice of issuance, upon a stock exchange, and that a Registration Statement
under the Securities Act of 1933, as amended, with respect to said shares shall
be effective.
 
                          ARTICLE XI -- ADMINISTRATION
 
11.01  APPOINTMENT OF ADMINISTRATOR
 
     The Executive Compensation Committee of the Board of Directors of the
Company (the "Committee") shall administer the Plan. No member of the Committee
shall be eligible to purchase stock under the Plan.
 
11.02  AUTHORITY OF COMMITTEE
 
     Subject to the express provisions of the Plan, the Committee shall have
complete authority in its discretion to interpret and construe any and all
provisions of the Plan, to adopt rules and regulations for administering the
Plan, and to make all other determinations deemed necessary or advisable for
administering the Plan. The Committee's determination on the foregoing matters
shall be conclusive.
 
                                       B-5
<PAGE>   36
 
11.03  RULES GOVERNING THE ADMINISTRATION OF THE COMMITTEE
 
     All determinations of the Committee shall be made by a majority of its
members. The Committee may correct any defect or omission or reconcile any
inconsistency in the Plan, in the manner and to the extent it shall deem
desirable.
 
                          ARTICLE XII -- MISCELLANEOUS
 
12.01  DESIGNATION OF BENEFICIARY
 
     A participant may file a written designation of a beneficiary who is to
receive any stock and/or cash. Such designation of beneficiary may be changed by
the participant at any time by written notice to the Company. Upon the death of
a participant and upon receipt by the Company of proof of identity and existence
at the participant's death of a beneficiary validly designated by him under the
Plan, the Company shall deliver such stock and/or cash to such beneficiary. In
the event of the death of a participant and in the absence of a beneficiary
validly designated under the Plan who is living at the time of such
participant's death, the Company shall deliver such stock and /or cash to the
executor or administrator of the estate of the participant, or if no such
executor or administrator has been appointed (to the knowledge of the Company),
the Company, in its discretion, may deliver such stock and/or cash to the spouse
or to any one or more dependents of the participant as the Company may
designate. No beneficiary shall, prior to the death of the participant by whom
he has been designated, acquire any interest in the stock or cash credited to
the participant under the Plan.
 
12.02  TRANSFERABILITY
 
     Neither payroll deductions credited to a participant's account nor any
rights with regard to the exercise of any option or the right to receive stock
under the Plan may be assigned, transferred, pledged, or otherwise disposed of
in any way by the participant other than by will or the laws of descent and
distribution. Any such attempted assignment, transfer, pledge or other
disposition shall be without effect, except that the Company may treat such act
as an election to withdraw funds in accordance with sec.7.02.
 
12.03  USE OF FUNDS
 
     All payroll deductions received or held by the Company under this Plan may
be used by the Company for any corporate purpose and the Company shall not be
obligated to segregate such payroll deductions.
 
12.04  ADJUSTMENT UPON CHANGES IN CAPITALIZATION
 
     If, while any options are outstanding, the outstanding shares of Common
Stock of the Company have increased, decreased, changed into, or been exchanged
for a different number or kind of shares or securities of the Company through
reorganization, merger, recapitalization, reclassification, stock split, reverse
stock split, or similar transaction, appropriate and proportionate adjustments
may be made by the Committee in the number and/or kind of shares which are
subject to purchase under outstanding options and on the option exercise price
or prices applicable to such outstanding options. In addition, in any such
event, the number and/ or kind of shares which may be offered in the Offerings
described in Article IV hereof shall also be proportionately adjusted.
 
     Upon the dissolution or liquidation of the Company, or upon a
reorganization, merger or consolidation of the Company with one or more
corporations as a result of which the Company is not the surviving corporation,
or upon a sale of substantially all of the property of stock of the Company to
another corporation, the holder of each option then outstanding under the Plan
will thereafter be entitled to receive at the next Offering Termination Date
upon the exercise of such option for each share as to which such option shall be
exercised, as nearly as reasonably may be determined, the cash, securities
and/or property which a holder of one share of the Common stock was entitled to
receive upon and at the time of such transaction. The Board of Directors shall
take such steps in connection with transactions as the Board shall deem
necessary to assure that provisions of this sec.12.04 shall thereafter be
applicable, as nearly as reasonably may be determined, in relation to the said
cash, securities and/or property as to which such holders of such option might
thereafter be entitled to receive.
 
                                       B-6
<PAGE>   37
 
12.05  AMENDMENT AND TERMINATION
 
     The Board of Directors shall have complete power and authority to terminate
or amend the Plan; provided, however, that the Board of Directors shall not,
without the approval of the stockholders of the Corporation (i) increase the
maximum number of shares which may be issued under the Plan (except pursuant to
sec.12.04); (ii) amend the requirements as to the class of employees eligible to
purchase stock under the Plan or permit the members of the Committee to purchase
stock under the Plan. No termination, modification, or amendment of the Plan
may, without the consent of an employee then having an option under the Plan to
purchase stock, adversely affect the rights of such employee under such option.
 
12.06  EFFECTIVE DATE
 
     The Plan shall become effective as of June 7, 1999 subject to approval by
the holders of the majority of the Common Stock present and represented at a
special or annual meeting of the shareholders held on or before June 7, 1999 or
at any postponement or adjournment thereof. If the Plan is not so approved, the
Plan shall not become effective.
 
12.07  NO EMPLOYMENT RIGHTS
 
     The Plan does not, directly or indirectly, create any right for the benefit
of any Employee or class of Employees to purchase any shares under the Plan, or
create in any Employee or class of Employees any right with respect to
continuation of employment by the Company, and it shall not be deemed to
interfere in any way with the Company's right to terminate, or otherwise modify,
an Employee's employment at any time.
 
12.08  EFFECT OF PLAN
 
     The provisions of the Plan shall, in accordance with its terms, be binding
upon, and inure to the benefit of, all successors of each Employee participating
in the Plan, including, without limitation, such Employee's estate and the
executors, administrators or trustees thereof, heirs and legatees, and any
receiver, trustee in bankruptcy or representative of creditors of such Employee.
 
12.09  GOVERNING LAW
 
     The law of the State of Maryland will govern all matters relating to this
Plan except to the extent it is superseded by the laws of the United States.
 
                                            Adopted by the Board of Directors on
 
                                            ------------------------------------
 
                                            Approved by the Company's
                                            Stockholders on
 
                                            ------------------------------------
 
                                       B-7
<PAGE>   38
 
                                                                      0936-PS-99
<PAGE>   39

<TABLE>
<S>                                                                 <C>
- ---------------------------------------------------------------     ---------------------------------------------------------------
            PROXY AUTHORIZATION BY TELEPHONE                                       PROXY AUTHORIZATION BY INTERNET
- ---------------------------------------------------------------     ---------------------------------------------------------------
It's fast, convenient, and immediate!                               It's fast, convenient, and the proxy authorization/instructions
Call Toll-Free on a Touch-Tone Phone                                are immediately confirmed and posted.
1-877-PRX-VOTE (1-877-779-8683).

- ---------------------------------------------------------------     ---------------------------------------------------------------
Follow these four easy steps:                                       Follow these four easy steps:

1.  Read the accompanying Proxy Statement and Proxy Card.           1.  Read the accompanying Proxy Statement and Proxy Card. 

2.  Call the toll-free number                                       2.  Go to the Website
    1-877-PRX-VOTE (1-877-779-8683). For shareholders                   http://www.eproxyvote.com/utr
    residing outside the United States call collect 
    on a touch-tone phone 1-201-536-8073.                           3.  Enter your 14-digit Voter Control Number located on
                                                                        your Proxy Card above your name.
3.  Enter your 14-digit Voter Control Number located on
    your Proxy Card above your name.                                4.  Follow the instructions provided.

4.  Follow the recorded instructions.
- ---------------------------------------------------------------     ---------------------------------------------------------------
YOUR VOTE IS IMPORTANT!                                             YOUR VOTE IS IMPORTANT!
Call 1-877-PRX-VOTE anytime!                                        Go to http://www.eproxyvote.com/utr anytime!

                    DO NOT RETURN YOUR PROXY CARD IF YOU ARE AUTHORIZING YOUR PROXIES BY TELEPHONE OR INTERNET


UTR05A                                                        DETACH HERE
- -----------------------------------------------------------------------------------------------------------------------------------
[x] PLEASE MARK
    VOTES AS IN
    THIS EXAMPLE
 
THIS PROXY WILL BE VOTED AS DIRECTED, BUT IF NO DIRECTION IS INDICATED, THIS PROXY WILL BE VOTED FOR THE PROPOSALS STATED BELOW.

1.  To elect (01) Louis E. Lataif and (02) James T. Vanderslice                                              FOR  AGAINST  ABSTAIN
    as directors for three-year terms, (03) Alan R. Schuele as      2.  To approve the Unitrode Corporation  [ ]    [ ]      [ ]
    a director for a two-year term and (04) Dietrich R. Erdmann         1999 Equity Incentive Plan.
    as a director for a one-year term.
                         FOR          WITHHOLD                      3.  To approve the Unitrode Corporation  [ ]    [ ]      [ ]
                         [ ]            [ ]                             1999 Employee Stock Purchase Plan.

    [ ]____________________________________________
       For all nominees except as noted above.
                                                                    MARK HERE FOR ADDRESS CHANGE AND NOTE AT LEFT            [ ]

                                                                    Please sign exactly as your name or names appear hereon. If
                                                                    shares are held jointly, each holder should sign. When signing
                                                                    in a fiduciary or representative capacity, please give full
                                                                    title. If the proxy is authorized by a corporation, it should be
                                                                    executed in the full corporate name by a duly authorized
                                                                    officer. If a partnership, please sign in the partnership name
                                                                    by an authorized person.

                                                                    PLEASE COMPLETE, DATE AND SIGN THIS PROXY AND RETURN IT PROMPTLY
                                                                    IN THE ENCLOSED ENVELOPE, WHETHER OR NOT YOU PLAN TO ATTEND THE
                                                                    ANNUAL MEETING ON JUNE 7, 1999. IF YOU ATTEND THE ANNUAL
                                                                    MEETING, YOU MAY VOTE IN PERSON IF YOU WISH, EVEN IF YOU HAVE
                                                                    PREVIOUSLY RETURNED YOUR PROXY.

Signature: _________________________________ Date: ___________      Signature: _________________________________ Date: ____________
        

</TABLE>


        
<PAGE>   40

UTR05B                             DETACH HERE
- --------------------------------------------------------------------------------

                                    PROXY
                                      
                             UNITRODE CORPORATION
                                      
                  PROXY SOLICITED BY THE BOARD OF DIRECTORS
                    FOR THE ANNUAL MEETING OF STOCKHOLDERS
                               ON JUNE 7, 1999



   The undersigned stockholder of Unitrode Corporation, a Maryland Corporation
(the "Company"), hereby appoints Robert J. Richardson and Allan R. Campbell, or
either of them, proxies for the undersigned with full power of substitution and
resubstitution, in each of them, to attend the Annual Meeting of the
Stockholders of the Company to be held on Monday, June 7, 1999, at 11:00 a.m.,
local time, at the Executive Leadership Center, Boston University School of
Management, 595 Commonwealth Avenue, Boston, Massachusetts, and any
postponement or adjournment thereof to cast on behalf of the undersigned all
votes that the undersigned is entitled to cast at such meeting and otherwise to
represent the undersigned at the meeting with all the powers possessed by the
undersigned if personally present at the meeting. The undersigned hereby
acknowledges receipt of the accompanying Notice of Annual Meeting of
Stockholders and Proxy Statement and revokes any proxy heretofore given with
respect to such meeting.

   The votes entitled to be cast by the undersigned will be cast as instructed
below. If this Proxy is executed but no instruction is given, the votes
entitled to be cast by the undersigned will be cast "for" each of the nominees
for director and "for" each of the other proposals as described in the Proxy
Statement and in the discretion of the Proxy holder on any other matter that
may properly come before the meeting or any adjournment or postponement
thereof.

- -----------------                                                 --------------
  SEE REVERSE                                                       SEE REVERSE
     SIDE            CONTINUED AND TO BE SIGNED ON REVERSE SIDE         SIDE
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