LTC3548 - Dual Synchronous, 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator; Package: DFN; Pins: 10; Temperature Range: -40°C to 85°C
IC 2.1 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6, 1 MM HEIGHT, PLASTIC, MO-193, TSOT-23, Switching Regulator or Controller

LTC3561 - 1A, 4MHz, Synchronous Step-Down DC/DC Converter; Package: DFN; Pins: 8; Temperature Range: -40°C to 85°C
IC 0.45 A SWITCHING REGULATOR, PDSO6, PLASTIC, SC70, 6 PIN, Switching Regulator or Controller
LTC3525 - 400mA Micropower Synchronous Step-Up DC/DC Converter with Output Disconnect; Package: SC70; Pins: 6; Temperature Range: -40°C to 85°C

Sync Step Down DC-DC Conv, 0.8A, 2.5-5.5V In, 0.6-5.5V Out, 6-Pin TSOT-23