Summary of MONOLITHIC POWER SYSTEMS INC

Item 1.01 Entry into a Material Definitive Agreement.

On October 23, 2008, Monolithic Power Systems, Inc. (the "Company") and Brokaw Interests ("the Landlord") entered into a lease agreement for the Company's headquarters located at 6409 Guadalupe Mines Road, San Jose, CA. The lease is for 55,116 square feet. The term shall be for eighty-four (84) months, commencing November 1, 2009 and ending October 31, 2016.

The Company shall pay base monthly rent in accordance with the following schedule:

                   11/01/09 - 10/31/10:   $82,674.00 per month
                   11/01/10 - 10/31/11:   $85,981.00 per month
                   11/01/11 - 10/31/12:   $89,420.00 per month
                   11/01/12 - 10/31/13:   $92,997.00 per month
                   11/01/13 - 10/31/14:   $96,717.00 per month
                   11/01/14 - 10/31/15:   $100,586.00 per month
                   11/01/15 - 10/31/16:   $104,609.00 per month

The Company will also be responsible for certain building operating expenses and real estate taxes. The lease agreement is attached hereto as Exhibit 10.

Item 9.01. Financial Statements and Exhibits

(d) Exhibits.

Exhibit No.        Description

    10             Lease Agreement between Monolithic Power Systems, Inc. and
                   Brokaw Interests, dated October 23, 2008