<SEC-DOCUMENT>0001437749-15-011514-index.html : 20150601
<SEC-HEADER>0001437749-15-011514.hdr.sgml : 20150601
<ACCEPTANCE-DATETIME>20150601145806
ACCESSION NUMBER:		0001437749-15-011514
CONFORMED SUBMISSION TYPE:	SD
PUBLIC DOCUMENT COUNT:		1
<RULE>
<RULE-NAME>13p-1
<ITEM>
<ITEM-NUMBER>1.01
<ITEM-PERIOD>20141231
</ITEM>
</RULE>
FILED AS OF DATE:		20150601
DATE AS OF CHANGE:		20150601

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MONOLITHIC POWER SYSTEMS INC
		CENTRAL INDEX KEY:			0001280452
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				770466789
		STATE OF INCORPORATION:			CA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SD
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-51026
		FILM NUMBER:		15902936

	BUSINESS ADDRESS:	
		STREET 1:		79 GREAT OAKS BLVD
		CITY:			SAN JOSE
		STATE:			CA
		ZIP:			95119
		BUSINESS PHONE:		(408) 826-0600

	MAIL ADDRESS:	
		STREET 1:		79 GREAT OAKS BLVD
		CITY:			SAN JOSE
		STATE:			CA
		ZIP:			95119
</SEC-HEADER>
<DOCUMENT>
<TYPE>SD
<SEQUENCE>1
<FILENAME>mpwr20150529_sd.htm
<DESCRIPTION>FORM SD
<TEXT>
Document 1 - file: mpwr20150529_sd.htm

</DOCUMENT>
</SEC-DOCUMENT>