The LTC3520 from Analog Devices is a DC to DC Converter with Input Voltage 2.2 to 5.5 V, Output Voltage 1 0.8 to 5.25 V, Output Current 1 1000 mA, Operating Temperature -40 to 125 Degree C, Storage Temperature -65 to 150 Degree C. Tags: Surface Mount, Buck-Boost. More details for LTC3520 can be seen below.