UNITRODE CORP
SC 13D/A, 1998-06-30
SEMICONDUCTORS & RELATED DEVICES
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                     SECURITIES AND EXCHANGE COMMISSION
                           Washington, D.C.  20549
  

                               AMENDMENT NO. 1
                                     TO
                                SCHEDULE 13D
                               (Rule 13d-101) 
  
                  Under the Securities Exchange Act of 1934
  
  
                     BENCHMARQ MICROELECTRONICS, INC.
                     --------------------------------
                              (Name of Issuer) 
  
                   Common Stock, par value $.001 per share
                   ---------------------------------------
                       (Title of Class of Securities) 
  
                                 00 00816031
                   -------------------------------------
                   (CUSIP Number of Class of Securities) 
  
                          Allan R. Campbell, Esq. 
                           Unitrode Corporation 
                         7 Continental Boulevard 
                      Merrimack, New Hampshire 03054 
                              (603)424-2410
        --------------------------------------------------------
        (Name, Address and Telephone Number of Person Authorized 
                  to Receive Notices and Communications) 
  
                                Copy to: 
  
                       Margaret A. Brown, Esq. 
              Skadden, Arps, Slate, Meagher & Flom, LLP 
                     One Beacon St., 31st Floor 
                        Boston, MA 02108-3194 
                            (617) 573-4800 
  

                              June 23, 1998
                     -----------------------------
                     (Date of Event which Requires 
                       Filing of this Statement) 
  

 If the filing person has previously filed a statement on Schedule 13G to
 report the acquisition which is the subject of this Statement because of
 Rule 13d-1(b)(3) or (4), check the following: 
                                                 ( ) 

 Check the following box if a fee is being paid with this Statement: 
                                                 ( ) 



 CUSIP No.                           13D                                    
 0000816031                                                                 
 ---------------------------------------------------------------------------
 (1)  NAMES OF REPORTING PERSONS 
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS 

      UNITRODE CORPORATION 
      042271186 
 ---------------------------------------------------------------------------
 (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: 
                                                        (a) ( )
                                                        (b) ( )
 ---------------------------------------------------------------------------
 (3)  SEC USE ONLY 
  
 ---------------------------------------------------------------------------
 (4)  SOURCE OF FUNDS* 
  
      WC/00   
 ---------------------------------------------------------------------------
 (5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
      ITEMS 2(d) or 2(e) 
                                                        ( )
 ---------------------------------------------------------------------------
 (6)  CITIZENSHIP OR PLACE OF ORGANIZATION 

      MARYLAND 
 ---------------------------------------------------------------------------
                               : (7)  SOLE VOTING POWER 
                               : 
                               :            955,158(1)
                               :--------------------------------------------
 NUMBER OF SHARES              : (8)  SHARED VOTING POWER 
 BENEFICIALLY OWNED BY         : 
 EACH REPORTING PERSON WITH    :          1,460,609(2)
                               :--------------------------------------------
                               : (9)  SOLE DISPOSITIVE POWER 
                               :
                               :           955,158(1)
                               :--------------------------------------------
                               : (10) SHARED DISPOSITIVE POWER 
                               :
                               :         1,460,609(2)
 ---------------------------------------------------------------------------
 (11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 

      2,415,767(1 AND 2)
 ---------------------------------------------------------------------------
 (12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11  
      EXCLUDES CERTAIN SHARES*                        ( ) 

      N/A 
 ---------------------------------------------------------------------------
 (13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11 

      APPROXIMATELY 29.9%(3)
 ---------------------------------------------------------------------------
 (14) TYPE OF REPORTING PERSON* 

      CO 
 ---------------------------------------------------------------------------
  
 *    SEE INSTRUCTIONS BEFORE FILLING OUT! 

  
 (1)  955,158 of the shares of Issuer common stock covered by this report
      are purchasable by the Reporting Person upon exercise of an option
      originally granted to the Reporting Person as of March 2, 1998, and
      described in Item 4 of this report.  Prior to the exercise of the
      option, the Reporting Person is not entitled to any rights as a
      stockholder of Issuer as to the shares covered by the option.  The
      option may only be exercised upon the happening of certain events
      referred to in Item 4, none of which has occurred as of the date
      hereof.  The Reporting Person expressly disclaims beneficial ownership
      of any of the shares of common stock of Issuer which are purchasable
      by the Reporting Person upon exercise of the option until such time as
      the Reporting Person purchases any such shares upon any such exercise. 
      The number of shares indicated represents 13.4% of the total
      outstanding shares of common stock of Issuer as of March 2, 1998,
      excluding shares issuable upon exercise of the option. 
  
 (2)  1,460,609 of the shares of the Issuer common stock covered by this
      report are subject to a Voting Agreement entered into by certain
      stockholders of the Issuer with the Reporting Person pursuant to which
      such stockholders have agreed to vote all of the shares beneficially
      owned by such stockholders in favor of certain matters, including
      without limitation the proposed merger of Merrimack Corporation, a
      wholly owned subsidiary of the Reporting Person, with and into the
      Issuer, and against, among other things, any action or agreement that
      could reasonably be executed to result, directly or indirectly, in a
      breach in any material respect of any covenant, representation or
      warranty or any obligation of the Issuer under the Agreement and Plan
      of Merger dated as of March 2, 1998, as amended on June 23, 1998,
      between the Issuer, Merrimack Corporation and the Reporting Person
      described in Item 3 hereof.  The Reporting Person expressly disclaims
      beneficial ownership of any of the shares of Issuer common stock
      covered by the Voting Agreement.  The number of shares indicated
      represents approximately 20.6% of the outstanding shares of common
      stock of the Issuer as of March 2, 1998, excluding the shares issuable
      upon exercise of the Option (as described above).   
  
 (3)  After giving effect to the exercise of the option as described herein.



 This Amendment No. 1 to Schedule 13D restates in its entirety the Schedule
 13D dated March 2, 1998 previously filed by Unitrode Corporation.   
  
 ITEM 1.   Security and Issuer. 
  
           This statement on Schedule 13D (the "Schedule 13D") relates to
 the common stock, par value $.001 per share (the "Shares" or the "Issuer
 Common Stock"), of BENCHMARQ Microelectronics, Inc., a Delaware corporation
 (the "Issuer").  The principal executive office of the Issuer is located at
 17919 Waterview Parkway, Dallas, Texas 75252. 
  
           The information set forth in the Exhibits hereto is hereby
 expressly incorporated herein by reference and the responses to each item
 of this Schedule 13D are qualified in their entirety by the provisions of
 such Exhibits. 
  
 ITEM 2.   IDENTITY AND BACKGROUND. 
  
           (a)-(c)  This Schedule 13D is filed by Unitrode Corporation, a
 Maryland corporation (the "Reporting Person"). 
  
           The business address of the Reporting Person is 7 Continental
 Boulevard, Merrimack, New Hampshire 03054.  The principal business of the
 Reporting Person is the design and manufacture of analog/linear integrated
 circuits. 
  
           To the best of the Reporting Person's knowledge as of the date
 hereof, the name, business address, present principal occupation or
 employment, name, principal business and address of any corporation or
 other organization in which such employment is conducted, and citizenship
 of each executive officer and director of the Reporting Person is set forth
 in Schedule I hereto.  The information contained in Schedule I is
 incorporated herein by reference. 
  
           (d)-(e)  During the last five years, neither the Reporting Person
 nor, to the best knowledge of the Reporting Person, any of the executive
 officers or directors of the Reporting Person, has been convicted in a
 criminal proceeding (excluding traffic violations or similar misdemeanors),
 or been a party to a civil proceeding of a judicial or administrative body
 of competent jurisdiction and as a result of such proceeding was or is
 subject to a judgment, decree or final order enjoining future violations
 of, or prohibiting or mandating activities subject to, Federal or State
 securities laws or finding any violation with respect to such laws.  
  
 ITEM 3.   SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION. 
  
           The Reporting Person entered into an Agreement and Plan of Merger
 dated as of March 2, 1998, as amended by an Amendment to Agreement and Plan
 of Merger dated as of June 23, 1998, by and among the Reporting Person,
 Merrimack Corporation, a Delaware corporation and wholly owned subsidiary
 of the Reporting Person ("Merger Sub"), and the Issuer (as amended, the
 "Merger Agreement"), providing for the merger (the "Merger") of the Merger
 Sub with and into the Issuer with the Issuer as the surviving corporation,
 pursuant to which each outstanding Share will be converted into the right
 to receive one share of common stock, par value $0.01 per share, of the
 Reporting Person (the "Reporting Person Common Stock") and one associated
 preferred stock purchase right (a "Right") issued in accordance with the
 Rights Agreement (the "Rights Agreement"), dated as of May 2, 1990, as
 amended from time to time, between the Reporting Person and the First
 National Bank of Boston (references to shares of the Reporting Person
 Common Stock issuable in the Merger are deemed to include the associated
 Rights).  The Merger is subject to the approval of the Merger by the
 Issuer's stockholders, the approval by the Reporting Person's stockholders
 of the issuance of Reporting Person Common Stock in the Merger, and any
 other required regulatory approvals, and the satisfaction or waiver of
 certain other conditions as more fully described in the Merger Agreement. 
 The foregoing summary of the Merger and the Merger Agreement is qualified
 in its entirety by reference to the Merger Agreement, a copy of which is
 included as Exhibit 1 to this Schedule 13D and is incorporated herein in
 its entirety by reference.   
  
           As a further inducement for the Reporting Person to enter into
 the Merger Agreement and in consideration thereof, Issuer and the Reporting
 Person entered into that certain Stock Option Agreement, dated as of March
 2, 1998, as amended June 23, 1998 (the "Option Agreement"), whereby Issuer
 granted to the Reporting Person an option (the "Option") to purchase, under
 certain circumstances described therein, up to 955,158 Shares at a purchase
 price per Share equal to $11.38, as adjusted as provided therein (the
 "Purchase Price").  Based on the number of Shares outstanding on March 2,
 1998, the Option would be exercisable for approximately 13.4% of the
 outstanding Shares, or approximately 10% of the Shares on a fully diluted
 basis after giving effect to the exercise of the Option.   
  
           None of the Triggering Events (defined in Item 4 below)
 permitting the exercise of the Option has occurred as of the date hereof. 
 In the event that the Option becomes exercisable and the Reporting Person
 wishes to purchase the Shares subject thereto, the Reporting Person
 anticipates that it would fund the exercise price with working capital or
 through other financing sources available to the Reporting Person at the
 time of exercise.  See also Item 4 below.   
  
           As a further inducement for the Reporting Person to enter into
 the Merger Agreement, Alan R. Schuele, Derrell C. Coker, L.J. Sevin, Harvey
 B. Cash, Dietrich Erdmann, Jack Kilby and Charles H. Phipps, stockholders
 of the Issuer (the "Stockholders") entered into a Voting Agreement, dated
 as of March 2, 1998, as amended June 23, 1998 (the "Voting Agreement"),
 with the Reporting Person whereby the Stockholders agreed to vote all of
 the Shares beneficially owned by them in favor of certain matters,
 including without limitation, the approval and adoption of the Merger
 Agreement, and against, among other things, any action or agreement that
 could reasonably be expected to result, directly or indirectly, in a breach
 in any material respect of any covenant, representation or warranty or any
 obligation of the Issuer under the Merger Agreement or the Option
 Agreement.  The Reporting Person did not pay additional consideration to
 any Stockholder in connection with the execution and delivery of the Voting
 Agreement.   
  
 ITEM 4.   PURPOSE OF THE TRANSACTION. 
  
           (a)-(j)  The information set forth in Item 3 is hereby
 incorporated herein by reference. 
  
           Pursuant to the Option Agreement, the Issuer has granted the
 Reporting Person the Option, which, based on the number of Shares
 outstanding on March 2, 1998, would be exercisable for approximately 13.4%
 of the outstanding Shares, or approximately 10% of the Shares on a fully
 diluted basis after giving effect to the exercise of the Option.   
  
           The Reporting Person may exercise the Option, in whole or in
 part, at any time and from time to time following the occurrence of certain
 events (each, a "Triggering Event"), provided that the Reporting Person
 provides notice of such exercise in accordance with the Option Agreement. 
 A Triggering Event includes the following:  
  
           (i) any Person (as defined in the Merger Agreement) (other than
      the Reporting Person or any subsidiary of the Reporting Person) shall
      have commenced (as such term is defined in Rule 14d-2 under the
      Securities Exchange Act of 1934, as amended (the "Exchange Act")) or
      shall have filed a registration statement under the Securities Act of
      1933, as amended (the "Securities Act"), with respect to a tender
      offer or exchange offer to purchase any shares of Issuer Common Stock
      such that, upon consummation of such offer, such Person would own or
      control 10% or more of the then outstanding Issuer Common Stock; 
  
           (ii) the Issuer or any subsidiary of the Issuer shall have
      authorized, recommended, proposed or publicly announced an intention
      to authorize, recommend or propose, or entered into, an agreement with
      any Person (other than the Reporting Person or any subsidiary of the
      Reporting Person) to (A) effect a merger, reorganization,
      consolidation, share exchange or other business combination or similar
      transaction involving the Issuer or any of its Significant
      Subsidiaries (within the meaning of Rule 1-02 of Regulation S-X of the
      Securities and Exchange Commission), (B) sell, lease or otherwise
      dispose of assets of the Issuer or its subsidiaries representing 10%
      or more of the consolidated assets of the Issuer other than in the
      ordinary course of business or (C) issue, sell or otherwise dispose of
      (including by way of merger, reorganization, consolidation, share
      exchange or other business combination or any similar transaction)
      securities (or options, rights or warrants to purchase, or securities
      convertible into or exchangeable for, such securities) representing
      10% or more of the voting power of the Issuer or any of its
      Significant Subsidiaries; or 
  
           (iii) any Person (other than the Reporting Person or any
      subsidiary of the Reporting Person or the Issuer or, in a fiduciary
      capacity, any subsidiary of the Issuer) shall have, subsequent to the
      date of the Option Agreement, acquired beneficial ownership (as such
      term is defined in Rule 13d-3 under the Exchange Act) or the right to
      acquire beneficial ownership of, or any "Group" (as such term is
      defined under the Exchange Act) shall have been formed which
      beneficially owns or has the right to acquire beneficial ownership of,
      10% or more of the then outstanding Issuer Common Stock. 
  
 provided, that the Option will terminate either (i)immediately prior to the
 Effective Time (as defined in the Merger Agreement) of the Merger; or (ii)
 at the time of termination of the Merger Agreement (A) by the Issuer or the
 Reporting Person pursuant to Subsection 9.1(d) of the Merger Agreement,
 provided that the matter giving rise to the Order (as defined in the Merger
 Agreement) providing the basis for termination under Subsection 9.1(d) of
 the Merger Agreement shall not have been initiated by the Issuer or any
 Person who initiates an Acquisition Proposal (as such item is defined in
 the Merger Agreement), (B) by the Issuer pursuant to Subsection 9.1(c) or
 Subsection 9.1(j) of the Merger Agreement, (C) by either the Issuer or the
 Reporting Person pursuant to Subsection 9.1(g) of the Merger Agreement, (D)
 by both the Issuer and the Reporting Person pursuant to Subsection 9.1(a)
 of the Merger Agreement, (E) by the Issuer or the Reporting Person pursuant
 to Subsection 9.1(e) of the Merger Agreement (if there then exists
 circumstances that would permit termination of the Merger Agreement by the
 Issuer pursuant to Subsection 9.1(e) of the Merger Agreement), (F) by the
 Reporting Person pursuant to Subsection 9.1(i)(i) of the Merger Agreement
 (if circumstances exist that would allow the Company to terminate the
 Merger Agreement pursuant to Subsection 9.1(c) of the Merger Agreement as a
 result of a change that would have a Material Adverse Effect with respect
 to the Reporting Person) or (G) by either party pursuant to any other
 provision of the Merger Agreement; provided (in the case of subsection (G))
 such termination occurs prior to the occurrence of an Acquisition Proposal. 
  
           Upon the occurrence of certain events set forth in the Option
 Agreement, the Issuer is required to repurchase the Option (the
 "Repurchase") or to cause the Option to be converted into, or exchanged
 for, an option of another corporation (the "Substitute Option").  In
 addition, the Option Agreement grants certain registration rights (the
 "Registration Rights") to the Reporting Person with respect to the Shares
 represented by the Option.  Also, under certain circumstances, the Issuer
 is entitled to a right of first refusal (the "Right of First Refusal") if
 the Reporting Person desires to sell all or any part of the Option or
 Shares acquired by it pursuant thereto.  Notwithstanding any other
 provisions of the Option Agreement, the Total Profit (as defined therein)
 which the Reporting Person may realize from the Option may not exceed
 $7,278,000.  The terms of such Repurchase, Substitute Option, Registration
 Rights, Right of First Refusal and limitations on Total Profit are set
 forth in the Option Agreement.  The foregoing summary of the Amendment to
 Option Agreement is qualified in its entirety by reference to the copy of
 the Option Agreement included as Exhibit 2 of this Schedule 13D and
 incorporated herein in its entirety by reference.  
  
           Pursuant to the Voting Agreement, the Stockholders agreed to vote
 all of the Shares beneficially owned by them in favor of certain matters,
 including without limitation, the approval and adoption of the Merger
 Agreement, and against, among other things, any action or agreement that
 could reasonably be expected to result, directly or indirectly, in a breach
 in any material respect of any covenant, representation or warranty or any
 obligation of the Issuer under the Merger Agreement or the Option
 Agreement.  The Voting Agreement terminates upon the earlier to occur of
 the Effective Time or the termination of the Merger Agreement.  The name of
 each Stockholder and the number of outstanding shares of Issuer Common
 Stock held by each Stockholder are set forth on Schedule A to the Amendment
 to Voting Agreement which is incorporated herein by reference.  The
 foregoing summary of the Amendment to Voting Agreement is qualified in its
 entirety by reference to the copy of the Voting Agreement included as
 Exhibit 3 of this Schedule 13D and incorporated herein in its entirety by
 reference.  
  
           The purpose of the Option Agreement and the Voting Agreement are
 to facilitate consummation of the Merger. 
  
           Upon consummation of the Merger as contemplated by the Merger
 Agreement, (a) a new subsidiary of the Reporting Person will be merged into
 the Issuer, (b) the Board of Directors of the Issuer will be replaced by
 the Board of Directors of Merger Sub, (c) the Certificate of Incorporation
 and Bylaws of the Issuer will be replaced by the Certificate of
 Incorporation and Bylaws of the Merger Sub, (d) the Shares will cease to be
 authorized for listing on the Nasdaq National Market and (e) the Shares
 will become eligible for termination of registration pursuant to Section
 12(g)(4) of the Exchange Act. 
  
 ITEM 5.   INTEREST IN SECURITIES OF THE ISSUER. 
  
           (a)-(b)  The number of Shares covered by the Option is 955,158,
 which constitutes approximately (i) 13.4% of Issuer Common Stock based on
 the Shares issued and outstanding on March 2, 1998, or (ii) 10% of the
 shares of Issuer Common Stock that would be outstanding after giving effect
 to the exercise of the Option.      
  
           Prior to the exercise of the Option, the Reporting Person (i) is
 not entitled to any rights as a stockholder of Issuer as to the Shares
 covered by the option and (ii) disclaims any beneficial ownership of the
 shares of Issuer Common Stock which are purchasable by the Reporting Person
 upon exercise of the Option because the Option is exercisable only in the
 limited circumstances referred to in Item 4 above, none of which has
 occurred as of the date hereof.  If the Option were exercised, the
 Reporting Person would have the sole right to vote or to dispose of the
 shares of Issuer Common Stock issued as a result of such exercise. 
  
           The number of Shares covered by the Voting Agreement is
 1,460,609, which constitutes approximately 20.6% of the Issuer Common
 Stock, based on the number of Shares outstanding as of March 2, 1998.   
  
           The Reporting Person (i) is not entitled to any rights as a
 stockholder of Issuer as to the Shares covered by the Voting Agreement and
 (ii) disclaims any beneficial ownership of the shares of Issuer Common
 Stock which are by the Voting Agreement.  
  
           (c)  Other than as set forth in this Item 5, to the best of the
 Reporting Person's knowledge as of the date hereof (i) neither the
 Reporting Person nor any subsidiary or affiliate of the Reporting Person
 nor any of the Reporting Person's executive officers or directors,
 beneficially owns any shares of Issuer Common Stock, and (ii) there have
 been no transactions in the shares of Issuer Common Stock effected during
 the past 60 days by the Reporting Person, nor to the best of the Reporting
 Person's knowledge, by any subsidiary or affiliate of the Reporting Person
 or any of the Reporting Person's executive officers of directors. 
  
           (d)  No other person is known by the Reporting Person to have the
 right to receive or the power to direct the receipt of dividends from, or
 the proceeds from the sale of, the Issuer Common Stock obtainable by the
 Reporting Person upon exercise of the Option. 
  
           (e)  Not applicable. 
  
 ITEM 6.   CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH
           RESPECT TO SECURITIES OF THE ISSUER. 
  
      Copies of the Merger Agreement, the Option Agreement and the Voting
 Agreement are attached as Exhibits hereto and, to the best of the Reporting
 Person's knowledge, there are at present no contracts, arrangements,
 understandings or relationship (legal or otherwise) among the persons named
 in Item 2 above and between any such persons and any person which respect
 to any securities to the Issuer.   
  
 ITEM 7.   MATERIAL TO BE FILED AS EXHIBITS. 
  
 EXHIBIT   DESCRIPTION
 -------   -----------
    1      Amendment to Agreement and Plan of Merger, dated as of June 23,
           1998 by and among Unitrode Corporation, Merrimack Corporation and
           BENCHMARQ Microelectronics, Inc., without exhibits thereto.   
  
    2      Amendment to Stock Option Agreement, dated as of June 23, 1998 by
           and between Unitrode Corporation as "Grantee" and BENCHMARQ
           Microelectronics, Inc. as "Issuer." 
  
    3      Amendment to Voting Agreement, dated as of June 23, 1998, by and
           between Unitrode Corporation and Alan R. Schuele, Derrell C.
           Coker, L.J. Sevin, Harvey B. Cash, Dietrich Erdmann, Jack Kilby
           and Charles H. Phipps.    
  


                                 SIGNATURE 
  
           After reasonable inquiry and to the best of my knowledge and
 belief, I certify that this statement is true, complete and correct. 
  
                                   UNITRODE CORPORATION 
  
  
                                   By: ______________________________
                                   Name:  Allan R. Campbell 
                                   Title: Senior Vice President 
  
  
 Dated: June 30, 1998 





                                                              SCHEDULE I 
  
                      DIRECTORS AND EXECUTIVE OFFICERS 
                          OF UNITRODE CORPORATION 
  
  
           The following table sets forth the name, business address and
 present principal occupation or employment of each director and executive
 officer of the Reporting Person.  Each such person is a U.S. citizen, and
 the business address of each such person is 7 Continental Boulevard,
 Merrimack, New Hampshire 03054. 
  
 Name and Business                   Present Principal 
      Address                          Occupation
 ------------------                  -----------------

 Peter A. Brooke              Director of the Reporting Person

 Kenneth Hecht                Director of the Reporting Person

 Louis E. Lataif              Director of the Reporting Person

 James T. Vanderslice         Director of the Reporting Person

 Robert L. Gable              Director and Chairman of the Reporting
                              Person

 Robert J. Richardson         Director, President and Chief Executive
                              Officer of the Reporting Person

 Allan R. Campbell            Senior Vice President and General Counsel
                              of the Reporting Person

 S. Kelley MacDonald          Vice President Corporate Communications
                              of the Reporting Person

 Patrick J. Moquin            Vice President Human Resources of the
                              Reporting Person

 Cosmo S. Trapani             Executive Vice President and Chief
                              Financial Officer of the Reporting Person
  
  
  

                               EXHIBIT INDEX 
  
 EXHIBIT   DESCRIPTION                                                 PAGE 
 -------   -----------                                                 ----
    1      Amendment to Agreement and Plan of Merger, dated as
           of June 23, 1998 by and among Unitrode Corporation,
           Merrimack Corporation and BENCHMARQ Microelectronics,
           Inc., without exhibits thereto.
            
    2      Amendment to Stock Option Agreement, dated as of
           June 23, 1998 by and between Unitrode Corporation as
           "Grantee" and BENCHMARQ Microelectronics, Inc. as
           "Issuer." 
  
    3      Amendment to Voting Agreement, dated as of June 23,
           1998, by and between Unitrode Corporation and
           Alan R. Schuele, Derrell C. Coker, L.J. Sevin,
           Harvey B. Cash, Dietrich Erdmann, Jack Kilby and
           Charles H. Phipps.





                 AMENDMENT TO AGREEMENT AND PLAN OF MERGER
  
  
           THIS AMENDMENT TO AGREEMENT AND PLAN OF MERGER (this "Amendment")
 is being entered into as of June 23, 1998, by and among Unitrode
 Corporation, a Maryland corporation (the "Acquiror"), Merrimack
 Corporation, a Delaware corporation and a wholly owned subsidiary of the
 Acquiror ("Newco"), and BENCHMARQ Microelectronics, Inc., a Delaware
 corporation (the "Company"). 
  
           The Acquiror, Newco and the Company are parties to an Agreement
 and Plan of Merger, dated as of March 2, 1998 (the "Agreement"), and desire
 to amend certain terms and provisions of the Agreement as set forth
 therein. 
  
           NOW, THEREFORE, in consideration of the foregoing, the mutual
 covenants contained herein and the consummation of the transactions
 contemplated by the Agreement, the Acquiror, Newco and the Company agree as
 follows (with capitalized terms used and not defined herein having their
 respective meanings ascribed to them in the Agreement): 
  
           1.  Defined Terms.  (a) The definition of "Acquiror's Disclosure
 Letter" as set forth in Section 1.2 of the Agreement is hereby amended to
 read in its entirety as follows:
  
                "'Acquiror's Disclosure Letter' will mean a letter of even
 date with the Amendment to this Agreement dated as of June 23, 1998, by and
 among the Acquiror, Newco and the Company (the "Amendment") delivered by
 the Acquiror to the Company concurrently with the execution of the
 Amendment, which, among other things, will identify exceptions to the
 Acquiror's representations and warranties contained in Article V by
 specific section and subsection references." 
  
           (b) The definition of "Company's Disclosure Letter" as set forth
 in Section 1.2 of the Agreement is hereby amended to read in its entirety
 as follows: 
  
                "'Company's Disclosure Letter' will mean a letter of even
 date with the Amendment delivered by the Company to the Acquiror Companies
 concurrently with the execution of the Amendment, which, among other
 things, will identify exceptions to the Company's representations and
 warranties contained in Article IV by specific section and subsection
 references." 
  
           (c) The definition of "Exchange Ratio" as set forth in Section
 1.2 of the Agreement is hereby amended to read in its entirety as follows: 
  
                "'Exchange Ratio' will mean the ratio of conversion of
 Company Common Stock into Acquiror Common Stock pursuant to the Merger as
 provided in the first sentence of Subsection 3.1(a)." 
  
           2.  Merger Consideration.   (a) Section 3.1(a) of the Agreement
 is hereby amended to read in its entirety as follows:
  
           "Subject to the other provisions of this Article III, each share
           of Company Common Stock issued and outstanding immediately prior
           to the Effective Time (excluding any Company Common Stock
           described in Subsection 3.1(c)) will be converted into the right
           to receive one (1) share of Acquiror Common Stock (and the
           associated Acquiror Right) (the "Exchange Ratio"). 
           Notwithstanding the foregoing, if between the date of this
           Agreement and the Effective Time the outstanding shares of the
           Acquiror Common Stock or the Company Common Stock shall have been
           changed into a different number of shares or a different class,
           by reason of any stock dividend, subdivision, reclassification,
           recapitalization, split, conversion, consolidation, combination
           or exchange of shares, the Exchange Ratio will be correspondingly
           adjusted to reflect such stock dividend, subdivision,
           reclassification, recapitalization, split, conversion,
           consolidation, combination or exchange of shares." 
  
           (b) Section 3.2 of the Agreement is hereby amended to read in its
 entirety as follows: 
  
                 "[THIS SECTION INTENTIONALLY LEFT BLANK.]" 
  
           3.  Representations and Warranties.  
  
           (a) Section 4.8(a) of the Agreement is hereby amended to read in
 its entirety as follows:   
  
           "(a) except as set forth in Subsection 4.8(a) of the
           Company's Disclosure Letter, since March 31, 1998,
           (i) no event or events (other than any event that is
           directly attributable to the prospect of consummation
           of the Merger or is of general application to all or a
           substantial portion of the Company's industry and other
           than any event that is expressly subject to any other
           representation or warranty contained in this
           Article IV) have to the Knowledge of the Company,
           occurred that, individually or in the aggregate, would
           constitute or cause a Material Adverse Effect on the
           Company and (ii) there have not been any change or
           changes (other than any change that is directly
           attributable to the prospect of consummation of the
           Merger or is of general application to all or a
           substantial portion of the Company's industry and other
           than any change that is expressly subject to any other
           representation or warranty contained in this
           Article IV) in the business, condition (financial or
           other), results of operations, properties, assets or
           liabilities of the Company or its Subsidiaries which
           would have, in the aggregate, a Material Adverse Effect
           on the Company." 
  
           (b)  Section 4.22 of the Agreement is hereby amended to read in
 its entirety as follows: 
  
           "The Board of Directors of the Company has received the opinion
           of Prudential Securities, Inc., the Company's financial advisor,
           substantially to the effect that, as of June 23, 1998, the
           consideration to be received by the holders of Company Common
           Stock in the Merger is fair to such holders from a financial
           point of view, a copy of which opinion has been provided to the
           Acquiror." 
  
           (c) Section 5.8(a) of the Agreement is hereby amended to read in
 its entirety as follows:   
  
           "(a) Except as set forth in Subsection 5.8(a) of the
           Acquiror's Disclosure Letter, since May 2, 1998, (i) no
           event or events (other than any event that is directly
           attributable to the prospect of consummation of the
           Merger or is of general application to all or a
           substantial portion of the Acquiror's industry and
           other than any event that is expressly subject to any
           other representation or warranty continued in this
           Article V) have to the Knowledge of the Acquiror,
           occurred that, individually or in the aggregate, would
           constitute or cause a Material Adverse Effect on the
           Acquiror and (ii) there have not been any change or
           changes (other than any change that is directly
           attributable to the prospect of consummation of the
           Merger or is of general application to all or a
           substantial portion of the Acquiror's industry and
           other than any change that is expressly subject to any
           other representation or warranty contained in this
           Article V) in the business, condition (financial or
           other), results of operations, properties, assets or
           liabilities of the Acquiror or its Subsidiaries which
           would have, in the aggregate, a Material Adverse Effect
           on the Acquiror." 
  
           (d)  Section 5.14 of the Agreement is hereby amended to read in
 its entirety as follows: 
  
           "The Board of Directors of the Acquiror has received the opinion
           of Adams, Harkness & Hill, Inc., the Acquiror's financial
           advisor, substantially to the effect that, as of June 23, 1998,
           the consideration to be received by the holders of Acquiror
           Common Stock in the Merger is fair to such holders from a
           financial point of view, a copy of which opinion has been
           provided to the Company." 
  
           4.  Covenants.  Section 6.1 of the Agreement is hereby amended in
 its entirety to read:
  
           "(a) Each of the Company and the Acquiror hereby covenants and
           agrees that, except as set forth in Section 6.1(a) of the
           Company's Disclosure Letter or Section 6.1(a) of the Acquiror's
           Disclosure Letter, as the case may be, prior to the Effective
           Time, unless otherwise expressly contemplated by this Agreement
           or consented to in writing by the other, it will and will cause
           its Subsidiaries to operate its business in the usual and
           ordinary course consistent with past practice and use all
           reasonable efforts to preserve substantially intact its business
           organization, maintain its rights and franchises, retain the
           services of its respective key employees and preserve the
           goodwill of those having business relationships with it,
           including customers and suppliers.  The Company further covenants
           and agrees that prior to the Effective Time, except as otherwise
           consented to in writing by the Acquiror, it will and will cause
           its Subsidiaries to maintain and keep its properties and assets
           in as good repair and condition as at present, ordinary wear and
           tear excepted, and use all reasonable efforts to keep in full
           force and effect insurance and bonds comparable in amount and
           scope of coverage to that currently maintained, except in each
           case for any matters that, individually or in the aggregate,
           would not have a Material Adverse Effect on the Company." 
  
           5.  Termination.  (a) Section 9.1(h) of the Agreement is hereby
 amended to read in its entirety as follows:
  
                 "[THIS SECTION INTENTIONALLY LEFT BLANK.]" 
  
           (b)  Section 9.1(j) of the Agreement is hereby amended to read in
 its entirety as follows: 
  
           "(j) by the Company, if from and after the date of the
           Amendment, the Board of Directors of the Acquiror fails
           to recommend approval by the stockholders of the
           Acquiror of the issuance of shares of Acquiror Common
           Stock pursuant to this Agreement or withdraws or
           modifies (or publicly announces an intention to
           withdraw or modify) its approval and recommendation in
           a manner materially adverse to the Company or shall
           have resolved to do any of the foregoing;". 
  
           6.  Termination Fees.  (a) Section 9.2(b) of the Agreement is
 hereby amended to read in its entirety as follows:
            
           "(b)  If this Agreement is terminated:  (i) by the Acquiror
           pursuant to clause (i) of Subsection 9.1(i) hereof (except if
           circumstances exist that would allow the Company to terminate
           this Agreement pursuant to Subsection 9.1(c) hereof as a result
           of a Material Adverse Effect on the Acquiror); (ii) by the
           Acquiror pursuant to Subsection 9.1(i) hereof under any
           circumstances other than those described in clause (i) of this
           Subsection 9.2(b); (iii) by Acquiror or Company pursuant to
           Subsection 9.1(f) hereof because of the failure to obtain the
           required approval from the Company stockholders and at the time
           of such termination or prior to the Company Stockholders' Meeting
           there shall have been an Acquisition Proposal (whether or not
           such offer, proposal, announcement or agreement shall have been
           rejected or shall have been withdrawn prior to the time of such
           termination or of the Company Stockholders' Meeting); or (iv) by
           Acquiror as a result of Company's material breach of Section 7.3
           or Subsection 7.1(a) hereof, the Company shall promptly pay to
           Acquiror or the Company by wire transfer of same day funds not
           later than two Business Days after the date of such termination a
           termination fee of $4,528,000 (the "Termination Fee"), provided,
           however, that if this Agreement is terminated by Acquiror or the
           Company pursuant to Subsection 9.1(f) hereof under the
           circumstances described in Subsection 9.2(b)(iii) hereof, and at
           the time of such termination the stockholders of the Acquiror
           shall have failed to approve the issuance of Acquiror Common
           Stock pursuant to this Agreement, the Acquiror shall not be
           entitled to the Termination Fee." 
  
           (b)   Section 9.2(c) of the Agreement is hereby amended to read
 in its entirety as follows: 
  
           "(c) If this Agreement is terminated by the Company
           pursuant to:  (i) Subsection 9.1(c) hereof as a result
           of the Acquiror's material breach of Subsection 7.1(b)
           or Section 7.3 hereof or (ii) Subsection 9.1(j) hereof
           (except in the case of any termination pursuant to
           Subsection 9.1(j) hereof described below), the Acquiror
           shall promptly pay to the Company by wire transfer of
           same day funds not later than two Business Days after
           written demand therefor, up to $500,000 to reimburse
           the Company for up to that amount of the Company's
           actual, verifiable out-of-pocket expenses incurred by
           the Company in connection with the Merger.  If this
           Agreement is terminated by the Company pursuant to
           Subsection 9.1(g), the Acquiror shall promptly pay to
           the Company by wire transfer of same day funds not
           later than two Business Days after written demand
           therefor, up to $250,000 to reimburse the Company for
           up to that amount of the Company's actual, verifiable
           out-of-pocket expenses incurred by the Company in
           connection with the Merger.  If this Agreement is
           terminated by the Company pursuant to Subsection 9.1(j)
           hereof, and at the time of such termination there shall
           have been an Acquiror Acquisition Proposal (whether or
           not such offer, proposal, announcement or agreement
           shall have been rejected or shall have been withdrawn
           prior to the time of such termination), and the
           stockholders of Acquiror shall have failed to approve
           the issuance of Acquiror Common Stock pursuant to this
           Agreement, the Acquiror shall promptly pay to the
           Company by wire transfer of same day funds not later
           than two Business Days after the date of such
           termination fee of $2,000,000.   
  
           7.  Agreement in Full Force and Effect.  
  
           (a)  The Company hereby represents and warrants to the Acquiror
 Companies that (i) each of the representations and warranties of the
 Company contained in the Agreement, as amended hereby, is true and correct
 as of the date hereof and (ii) each of the agreements and covenants of the
 Company required by the Agreement, as amended hereby, to have been complied
 with prior to the date hereof has been complied with in all respects. 
  
           (b)  The Acquiror Companies hereby represent and warrant to the
 Company that (i) each of the representations and warranties of the Acquiror
 Companies contained in the Agreement, as amended hereby, is true and
 correct as of the date hereof and (ii) each of the agreements and covenants
 of the Acquiror Companies required by the Agreement, as amended hereby, to
 have been complied with prior to the date hereof has been complied with in
 all respects. 
  
           (c)  The Agreement, as amended by this Amendment, shall remain in
 full force and effect. 
  

           IN WITNESS WHEREOF, the parties hereto have caused this Amendment
 to be signed by their duly authorized officers as of the date first above
 written. 
  
  
                               UNITRODE CORPORATION 
  
  
                               By________________________ 
                               Name: 
                               Title: 
  
  
                               MERRIMACK CORPORATION 
  
  
                               By________________________ 
                               Name: 
                               Title: 
  
  
                               BENCHMARQ MICROELECTRONICS, 
                                 INC. 
  
  
                               By__________________________ 
                               Name: 
                               Title: 
  




                       AMENDMENT TO STOCK OPTION AGREEMENT
  

           THIS AMENDMENT TO STOCK OPTION AGREEMENT (this "Amendment") is
 being entered into as of June 23, 1998, by and between Unitrode
 Corporation, a Maryland corporation ("Grantee"), and BENCHMARQ
 Microelectronics, Inc., a Delaware corporation (the "Company"). 
  
      WHEREAS, the Company, Grantee and Merrimack Corporation, a Delaware
 corporation and a wholly owned subsidiary of Grantee ("Newco"), entered
 into an Agreement and Plan of Merger dated as of March 2, 1998 (the
 "Original Agreement"), which provides, among other things, that Newco shall
 be merged with and into the Company pursuant to the terms and conditions
 thereof; and 
  
      WHEREAS, as an essential condition and inducement to Grantee to enter
 into the Original Agreement and in consideration therefor, the Company
 entered into a Stock Option Agreement as of March 2, 1998 (the "Stock
 Option Agreement"); and 
  
      WHEREAS, the Company, Grantee and Newco are contemporaneously with the
 execution of this Amendment entering into an Amendment to the Original
 Agreement amending certain provisions of the Original Agreement (as so
 amended, the "Amended Agreement"); and 
  
      WHEREAS, as an essential condition and inducement to Grantee to enter
 into the Amended Agreement and in consideration therefor, the Company has
 agreed to enter into this Amendment;  
  
      NOW, THEREFORE, in consideration of the foregoing and the mutual
 covenants and agreements contained herein and in the Amended Agreement, and
 intending to be legally bound hereby, the parties hereto hereby agree as
 follows (with capitalized terms used and not defined herein having their
 respective meanings ascribed to them in the Amended Agreement): 
  
           1.   References to the Merger Agreement.  All references to the
 Merger Agreement in the Stock Option Agreement are hereby amended to refer
 to the Amended Agreement. 
  
           2.   Grant of Option.   Section 1 of the Stock Option Agreement
 is amended in its entirety to read as follows:   
  
      "The Company hereby grants to Grantee an unconditional, irrevocable
 option (the "Option") to purchase, subject to the terms hereof, 955,158
 shares (such shares being referred to herein as the "Option Shares") of
 fully paid and nonassessable common stock, par value $.001 per share, of
 the Company ("Company Common Stock"), equal to approximately ten percent
 (10%) of the number of shares of Company Common Stock issued and
 outstanding (on a fully diluted basis after giving effect to the exercise
 of the Option) as of March 2, 1998 at a purchase price of $11.13 per share
 of Company Common Stock, as adjusted in accordance with the provisions of
 Section 8 (such price, as adjusted if applicable, the "Option Price")."
                 
           3.   Option Termination Events.   Section 2(b)(ii) of the Stock
 Option Agreement is amended in its entirety to read as follows:   
  
      "(ii) termination of the Merger Agreement (A) by either party pursuant
 to Subsection 9.1(d) of the Merger Agreement, provided that the matter
 giving rise to the Order (as defined in the Merger Agreement) providing the
 basis for termination under Subsection 9.1(d) of the Merger Agreement shall
 not have been initiated by the Company or any Person who initiates an
 Acquisition Proposal (as such term is defined in the Merger Agreement), (B)
 by the Company pursuant to Subsection 9.1(c) or Subsection 9.1(j) of the
 Merger Agreement, (C) by either the Company or the Grantee pursuant to
 Subsection 9.1(g) of the Merger Agreement, (D) by both parties pursuant to
 Subsection 9.1(a) of the Merger Agreement, (E) by the Company or the
 Grantee pursuant to Subsection 9.1(e) of the Merger Agreement (if there
 exists circumstances that would permit termination of the Merger Agreement
 by the Company pursuant to Subsection 9.1(e) of the Merger Agreement), (F)
 by the Grantee pursuant to Subsection 9.1(i)(i) of the Merger Agreement (if
 circumstances exist that would allow the Company to terminate the Merger
 Agreement pursuant to Subsection 9.1(c) of the Merger Agreement as a result
 of a change that would have a Material Adverse Effect with respect to
 Grantee) or (G) by either party pursuant to any other provision of the
 Merger Agreement; provided (in the case of Subsection 2(b)(ii)(G) hereof)
 such termination occurs prior to the occurrence of an Acquisition
 Proposal." 
  
           4.   Stock Option Agreement in Full Force and Effect.  The Stock
 Option Agreement, as amended by this Amendment, shall continue in full
 force and effect. 

      IN WITNESS WHEREOF, each of the parties hereto have caused this
 Amendment to be duly executed as of the date first written above. 
  
                          BENCHMARQ MICROELECTRONICS, INC.    
  
                           
                          By:__________________________________ 
                             Name:   Alan R. Schuele 
                             Title:  President and Chief Executive 
                                     Officer    
                                
                          UNITRODE CORPORATION 
                                
                      
                          By:__________________________________
                             Name:  Robert J. Richardson 
                             Title: President and Chief Executive
                                    Officer





                          AMENDMENT TO VOTING AGREEMENT
  
           THIS AMENDMENT TO VOTING AGREEMENT (this "Amendment") is being
 entered into as of June 23, 1998, by and among Alan R. Schuele, Derrell C.
 Coker, L.J. Sevin, Harvey B. Cash, Dietrich Erdmann, Jack Kilby and Charles
 H. Phipps (the "Stockholders"), and Unitrode Corporation, a Maryland
 corporation ("Unitrode"). 
  
      WHEREAS, BENCHMARQ Microelectronics, Inc., a Delaware corporation (the
 "Company"), Unitrode and Merrimack Corporation, a Delaware corporation and
 a wholly owned subsidiary of Unitrode, entered into an Agreement and Plan
 Merger dated as of March 2, 1998 (the "Original Agreement"), which
 provides, among other things, that Newco shall be merged with and into the
 Company pursuant to the terms and conditions thereof; and 
  
      WHEREAS, as an essential condition and inducement to Unitrode to enter
 into the Original Agreement and in consideration therefor, the Stockholders
 entered into a Voting Agreement dated as of March 2, 1998 (the "Voting
 Agreement"); and  
  
      WHEREAS, the Company, Unitrode and Newco are contemporaneously with
 the execution of this Amendment entering into an Amendment to the Original
 Agreement amending certain terms and provisions of the Original Agreement
 (as so amended, the "Amended Agreement"); and   
  
      WHEREAS, as an essential condition and inducement to Unitrode to enter
 into the Amended Agreement and in consideration therefor, the Stockholders
 have agreed to enter into this Amendment; and  
  
      WHEREAS, as of the date hereof, the Stockholders own of record and
 beneficially the shares of common stock, par value $.001 per share, of the
 Company (the "Company Common Stock") set forth opposite their respective
 names on Schedule A hereto and wish to enter into this Amendment with
 respect to such shares of Company Common Stock and options to purchase
 shares of Company Common Stock; 
  
      NOW, THEREFORE, in consideration of the foregoing and the mutual
 covenants and agreements contained herein and in the Amended Agreement, and
 intending to be legally bound hereby, the parties hereto hereby agree as
 follows (with capitalized terms used and not defined herein having their
 respective meanings ascribed to them in the Amended Agreement): 
  
           1.   References to the Merger Agreement.  All references to the
 Merger Agreement in the Voting Agreement are hereby amended to refer to the
 Amended Agreement. 
  
           2.   Voting Agreement in Full Force and Effect.  The Voting
 Agreement, as amended by this Amendment, shall continue in full force and
 effect. 


      IN WITNESS WHEREOF, each of the parties hereto have caused this
 Amendment to be duly executed as of the date first written above. 
  
                               ___________________________
                               Alan R. Schuele 
                                
                               __________________________
                               Derrell C. Coker 
       
                               __________________________
                               L.J. Sevin 

                               __________________________
                               Harvey B. Cash 

                               __________________________
                               Dietrich Erdmann 
  
                               __________________________
                               Jack Kilby 
            
                               __________________________
                               Charles H. Phipps 
  
  
                               UNITRODE CORPORATION 
                                
                      
                               By:_________________________
                               Name:   Robert J. Richardson 
                               Title:  President and Chief Executive
                                       Officer

  

                                VOTING AGREEMENT
                                   SCHEDULE A
  
                          Number of Shares of Company Common 
 Stockholder:                Stock Owned by Stockholder: 
  
 L.J. Sevin                              695,120 
 Jack Kilby                                6,250 
 Derrell C. Coker                         72,755 
 Dietrich Erdmann                        605,212 
 Harvey B. Cash                           43,850 
 Charles H. Phipps                        40,422 
 Alan R. Schuele                               0




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