The LTC3444 from Analog Devices is a DC to DC Converter with Input Voltage 2.7 to 5.5 V, Output Voltage 1 0.5 to 5 V, Output Current 1 400 mA, Operating Temperature -40 to 125 Degree C, Storage Temperature -65 to 125 Degree C. Tags: Surface Mount, Buck-Boost. More details for LTC3444 can be seen below.