Linear Technology
DC480A-D - LTC3405AES6-1.8 | Thin SOT Synchronous Buck Regulator, 2.5 to 5.5 Vin, 1.8Vout 300mA(3.0 Vin min), (High Efficiency Inductor)
Manual
LTC3405A-1.8 - Product Info
LTpowerCAD - Software