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For complete documentation, view the LTC3521IUF#PBF page

Part Number* Description Package Pins Price (1-99) Price (100+) QTY
LTC3521IUF#PBF 1A Buck-Boost and Dual 600mA Buck Synchronous DC/DC Converters QFN 24 $5.34 $4.54

* 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