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For complete documentation, view the LT3991EMSE#PBF page

Part Number*	Description	Package	Pins	Price (1-99)	Price (100+)	QTY
LT3991EMSE#PBF	55V, 1.2A, 2MHz Step-Down Regulator with 2.8uA Quiescent Current	MSOP	10	$4.22	$3.58

* When ordering part numbers ending in #TR or #TRM for quantities less than (or not an even multiple of) a full reel, parts will be shipped in bulk or cut tape