On April 28, 2009, Monolithic Power Systems, Inc. ("MPS"), a Delaware corporation, issued a press release and held a conference call regarding its financial results for the quarter ended March 31, 2009. A copy of the press release is attached hereto as Exhibit 99.1.

The information under this Item 2.02 of this Current Report on Form 8-K and the exhibit attached hereto are being furnished and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "1934 Act"), nor shall they be deemed incorporated by reference in any filing with the Securities and Exchange Commission under the 1934 Act or the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such filing.

(d) Exhibits.

Exhibit      Description

 99.1        Press Release issued on April 28, 2009, announcing the financial
             results for the quarter ended March 31, 2009