On March 5, 2009, in the case of Monolithic Power Systems, Inc. v. O2Micro International Limited ("O2"), the United States Court of Appeals for the Federal Circuit affirmed the judgment from the United States District Court for the Northern District of California that all of the claims of US Patent No. 6,396,722 asserted against MPS and its customers were invalid on the grounds of obviousness. The Court also dismissed O2's action and overturned a judgment in the Eastern District Court of Texas against Taiwan Sumida Electonics, Inc., a customer of MPS, on the basis that O2 cannot assert the same invalid claims. A press release is attached hereto as Exhibit 99.1.

(d) Exhibits.

Exhibit No.   Description
99.1          Press Release issued on March 6, 2009 announcing the decision of the
              United States Court of Appeals for the Federal Circuit to affirm the
              decision of the United States District Court for the Northern District
              of California in favor of Monolithic Power Systems, Inc. and its
              customers.