UNITRODE CORP
8-K/A, 1998-06-25
SEMICONDUCTORS & RELATED DEVICES
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                     SECURITIES AND EXCHANGE COMMISSION 
                           WASHINGTON, D.C. 20549 
  
                                 FORM 8-K/A 
                               CURRENT REPORT 
    
                   Pursuant to Section 13 or 15(d) of the 
                      Securities Exchange Act of 1934 
    
  
                               June 23, 1998          
                     (Date of earliest event reported) 
  
  
                          UNITRODE CORPORATION                   
           (Exact name of Registrant as specified in its charter) 
  
  
  Maryland                      1-5609                     04-2271188  
 (State of                (Commission File No.)          (IRS Employer 
 Incorporation)                                        Identification No.) 
  
  
                7 Continental Boulevard, Merrimack, NH 03054        
        (Address of principal executive offices, including zip code) 
  
  
                                (603) 424-2410                  
            (Registrant's telephone number, including area code) 
  
  
                                Not Applicable                      
       (Former name or former address, if changed since last report) 
  
  

 Item 5.   Other Events. 


      In the 8-K filing of June 24, 1998, the exercise price for the option
 was inadvertently misstated as $11.13 per share in both the Form 8-K and in
 the Amendment to the Stock Option Agreement, attached as Exhibit 2.2
 thereto.  The correct exercise price for the option is $11.38.  This
 amended 8-K and the attached Amendment to the Stock Option Agreement have
 been changed to reflect this corrected option price.   
  
      On June 23, 1998, Unitrode Corporation a Maryland corporation (the
 "Registrant"), Merrimack Corporation, a Delaware corporation and a wholly
 owned subsidiary of Unitrode ("Sub") and BENCHMARQ Microelectronics, Inc.,
 a Delaware corporation ("BENCHMARQ"), agreed to amend their previously
 reported Agreement and Plan of Merger, dated as of March 2, 1998 (the
 "Merger Agreement"), pursuant to an Amendment to Agreement and Plan of
 Merger (the Merger Agreement, as so amended, the "Amended Merger
 Agreement").   
  
      Under the terms of the Amended Merger Agreement, BENCHMARQ
 stockholders will receive one share (the "Exchange Ratio") of the
 Registrant's common stock, par value $.01 per share, for each outstanding
 share of BENCHMARQ common stock, par value $.001 per share ("BENCHMARQ
 Common Stock") and no adjustments to the Exchange Ratio will be made
 regardless of the trading value of the stock.  The other changes to the
 Merger Agreement effected by the Amended Merger Agreement relate to certain
 representations and warranties, and the termination and termination fees
 provisions. 
  
      On June 23, 1998, the Registrant and BENCHMARQ amended the Stock
 Option Agreement  (the "Stock Option Agreement") dated as of March 2, 1998
 (the Stock option Agreement, as so amended, the "Amended Stock Option
 Agreement") to modify certain termination events and to change the exercise
 price of the option to $11.38 per share. 
  
      On June 23, 1998, the Registrant and certain stockholders of BENCHMARQ
 amended Voting Agreement (the "Voting Agreement") dated as of March 2, 1998
 (the Voting Agreement, as so amended, the "Amended Voting Agreement") to
 reflect the obligation of such stockholders to vote their shares of
 BENCHMARQ Common Stock at a meeting of BENCHMARQ stockholders in favor of
 the transactions contemplated by the Amended Merger Agreement. 
  
      The foregoing is qualified in its entirety by reference to the
 Amendment to Agreement and Plan of Merger, the Amendment to Stock Option
 Agreement and the Amendment to Voting Agreement, and the Registrant's and
 BENCHMARQ's joint press release dated June 24, 1998, copies of which are
 attached as exhibits hereto and which are incorporated by reference herein. 


  
 Item 7.   Financial Statements, Pro Forma Financial Information and
           Exhibits 
  
 Exhibit No.              Description 
  
      2.1       Amendment to Merger Agreement, dated as of June 23, 1998, by
                and among Unitrode Corporation, Merrimack Corporation and
                BENCHMARQ Microelectronics, Inc. 
  
      2.2       Amendment to Stock Option Agreement dated as of June
                23, 1998, by and among Unitrode Corporation, Merrimack
                Corporation and BENCHMARQ Microelectronics, Inc. 
 




      2.3       Amendment to Voting Agreement, dated as of June 23, 1998, by
                and among Unitrode Corporation, Merrimack Corporation and
                BENCHMARQ Microelectronics, Inc. 
   
      99.1      Form of Joint Press Release issued by Unitrode Corporation
                and BENCHMARQ Microelectronics, Inc. on June 24, 1998. 



























































  

                                   SIGNATURE
  
           Pursuant to the requirements of the Securities Exchange Act of
 1934, as amended, the Registrant has duly caused this report to be signed
 on its behalf by the undersigned hereunto duly authorized. 
  
  
                                   UNITRODE CORPORATION 
  
  
  
                                   By: /s/ Robert J. Richardson 
                                      -------------------------- 
                                           Robert J. Richardson 
  
  
 Date:  June 24, 1998

















































  
                                 Exhibit Index
  
 Exhibit  No.          Description                                 Sequential
                                                                   Page No.
   2.1         Amendment to Merger Agreement, dated as of
               June 23, 1998, by and among Unitrode Corporation,
               Merrimack Corporation and BENCHMARQ 
               Microelectronics, Inc.

   2.2         Amendment to Stock Option Agreement dated as of
               June 23, 1998, by and among Unitrode Corporation,
               Merrimack Corporation and BENCHMARQ 
               Microelectronics, Inc.
 
   2.3         Amendment to Voting Agreement, dated as of June 23,
               1998, by and among Unitrode Corporation, Merrimack 
               Corporation and BENCHMARQ Microelectronics, Inc.
 
  99.1         Form of Joint Press Release issued by Unitrode 
               Corporation and BENCHMARQ Microelectronics, Inc. 
               on June 24, 1998.      
  




















































  
                 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 /s/ Robert J. Richardson 
                                      ---------------------------------
                                   Name:  Robert J. Richardson 
                                   Title: President and Chief Executive
                                             Officer
  
  
                                   MERRIMACK CORPORATION 
  
  
                                   By /s/ Robert J. Richardson
                                     ----------------------------------
                                   Name:  Robert J. Richardson 
                                   Title: President and Chief Executive
                                             Officer 
  
                                
                                   BENCHMARQ MICROELECTRONICS, INC. 
  
  
                                   By /s/ Alan Schuele
                                     ----------------------------------
                                   Name:  Alan Schuele   
                                   Title: President and Chief Executive
                                             Officer
  

































                    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 $11.38 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: /s/ Alan R. Schuele
                               _____________________________________
                               Name:   Alan R. Schuele 
                               Title:  President and Chief Executive 
                                          Officer    
  

                                
                                
                            UNITRODE CORPORATION 
                                
  
                            By: /s/ Robert J. Richardson 
                               _____________________________________
                               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. 
  
                               /s/ Alan R. Schuele
                               _______________________
                               Alan R. Schuele 
                                     

                               /s/ Derrell C. Coker 
                               _______________________
                               Derrell C. Coker 

       
                               /s/ L. J. Sevin
                               _______________________
                               L. J. Sevin 
                                

                               /s/ Harvey B. Cash 
                               _______________________
                               Harvey B. Cash 
            

                               /s/ Dietrich Erdmann 
                               _______________________
                               Dietrich Erdmann 


                               /s/ Jack Kilby
                               _______________________
                               Jack Kilby 


                               /s/ Charles H. Phipps 
                               _______________________
                               Charles H. Phipps 
  
  
                               UNITRODE CORPORATION 
                                
  
                               By: /s/ Robert J. Richardson 
                                   ____________________________
                               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




For further information, please contact:

At BENCHMARQ:                       At Unitrode:
Patty Smith                         S. Kelley MacDonald, Vice President
Manager, Corporate Communications   Corporate Communications,
BENCHMARQ Microelectronics, Inc.    Unitrode Corporation,
17919 Waterview Parkway             7 Continental Boulevard
Dallas, TX 75252                    Merrimack, NH  03054
(972)-437-9195                      (603) 429-8767
e-mail: [email protected]   e-mail: [email protected]


       UNITRODE AND BENCHMARQ ANNOUNCE AMENDED MERGER AGREEMENT;
                      EXCHANGE RATIO SET AT ONE-TO-ONE

Merrimack, NH (June 24 , 1998) -- Unitrode Corporation (NYSE--UTR) and
BENCHMARQ Microelectronics, Inc. (NASDAQ--BMRQ) jointly announced today
that their respective boards of directors have unanimously approved an
amended merger agreement. Under the terms of the revised agreement
BENCHMARQ stockholders will receive one share of Unitrode Common Stock for
each share of BENCHMARQ Common Stock outstanding, with this exchange ratio
not subject to further adjustment. Based on the June 23, 1998 closing price
of Unitrode Common Stock on the New York Stock Exchange and the current
number of shares outstanding, the transaction is valued at approximately
$80.9 million. Other than the addition of certain termination fees payable
to BENCHMARQ by Unitrode under the terms of the revised agreement, the
other material financial terms of the previously negotiated agreement
remain in force.

Both companies will convene and then adjourn the previously scheduled
stockholder meetings on June 29, 1998 to a date to be announced. The record
dates for each company's meeting will remain the same as those governing
the June 29, 1998 meetings. The companies will file an amended joint proxy
statement/prospectus with the Securities and Exchange Commission as soon as
possible. Following SEC clearance, stockholders will receive revised proxy
materials which will replace those mailed earlier. Robert J. Richardson,
currently President and Chief Executive Officer of Unitrode, who will
become Chairman and Chief Executive Officer of the combined company,
commented, "We are pleased to announce that the two companies have reached
this new agreement, and the strategic advantages of the merger remain very
compelling. Portable power is forecast to be one of the most rapidly
growing segments of the power management market. The design strengths,
sales presence, marketing capabilities, and the manufacturing resources are
complementary. The combined product lines of each company should create an
unbeatable leader in this area."

Alan R. Schuele, currently President and Chief Executive Officer of
BENCHMARQ, who will assume the position of President and Chief Operating
Officer, said, "We are pleased that this new agreement preserves the
strategic plans under development for the combined company. The opportunity
for BENCHMARQ to serve broader and more stable markets with its precision
mixed-signal products should enhance the Company's value to stockholders,
customers, and employees alike."

Unitrode Corporation designs and manufactures analog/linear and
mixed-signal integrated circuits, principally to perform power management,
motion control, and interface functions. Its products are sold throughout
the world for a variety of computer, tele- and data- communications,
defense/aerospace, industrial, and automotive applications. Further
information about Unitrode may be found at the Company's homepage site:
http://www.unitrode.com.

BENCHMARQ Microelectronics, Inc. designs and manufactures battery
management ICs and modules and nonvolatile product, which include RTC ICs
and modules, and NVSRAM modules and nonvolatile controller ICs and modules.
BENCHMARQ markets its products world wide through a network of distributors
and independent manufacturers' representatives.

Regarding BENCHMARQ Microelectronics, Inc:

The statements contained in this press release, other than historical
information, constitute forward-looking statements within the meaning of
the Private Securities Litigation Reform Act of 1995 and various factors
may impact upon such statements, including, without limitation, (i) certain
of the risks detailed from time-to-time in the Company's filings with the
SEC, including, without limitation, its: prospectus, dated December 1,
1995, as supplemented on December 21, 1995; Annual Report on Form 10-K for
the fiscal year ended December 31, 1997; and Quarterly Report on Form 10-Q
for the three-month period ended March 31, 1998; (ii) inability of the
Company to satisfy its production/delivery obligations due to disruption of
production; (iii) inability to obtain raw materials; (iv) cancellation of
orders by customers; (v) changes in the credit worthiness of customers;
(vi) political and/or economic disruption in the markets for the Company's
products; (vii) changes in demand for the Company's products; (viii)
changes in pricing for the Company's products; (ix) obsolescence of the
Company's products; (x) expenses related to legal disputes and adverse
legal rulings in such disputes; (xi) inability of the Company to timely
complete the development of certain of its products; (xii) inability of the
Company to manage its effective income tax rate; (xiii) inability to
realize the anticipated benefits of the proposed merger; (xiv) disruption
of the Company's business resulting from the proposed merger; (xv) failure
of the proposed merger with Unitrode to be consummated and (xvi) continued
softness in the semiconductor industry. Statements contained herein are
made as of the date hereof and the Company assumes no responsibility for
updating such information.

Regarding Unitrode Corporation:

Statements in this news release are made pursuant to the safe-harbor
provisions of the Private Securities Litigation Reform Act of 1995. Except
for historical information, the matters set forth in this release are
forward-looking and involve risk and uncertainty, including such factors
as, among others, the ability to book and ship within the quarter, the
demand for semiconductors generally and the specific demand for the
Company's products, production capacity constraints, the timely
introduction of new processes and products, and specifically the
qualification and start-up of the Company's new wafer fabrication facility,
the impact of competitive products and prices, unsettled conditions in the
hard disk drive market, and other risk factors described in the Company's
filings with the Securities and Exchange Commission.

Financial inquiries on BENCHMARQ Microelectronics, Inc:
Investor Relations
c/o Shelton Communcations Group
3 Lincoln Center
5430 LBJ Freeway Suite 280
Dallas, TX  75240
FAX: 972-239-2292
TEL: 972-239-5119
trademark: BENCHMARQ is a registered trademark of BENCHMARQ
Microelectronics, Inc.


                                   (END)




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