The LTC3531-3.3 from Analog Devices is a DC to DC Converter with Input Voltage 1.8 to 5.5 V, Output Voltage 1 3.3 to 3.3 V, Output Current 1 200 mA, Operating Temperature -40 to 85 Degree C, Storage Temperature -65 to 125 Degree C. Tags: Surface Mount, Buck-Boost. More details for LTC3531-3.3 can be seen below.