The B0303XT-W2R2 from MORNSUN is a DC to DC Converter with Input Voltage 2.97 to 3.63 V, Output Voltage 1 3.3 V, Output Current 1 8 to 76 mA, Output Power 250 mW, Operating Temperature -40 to 105 Degree C. Tags: Through Hole, Buck-Boost. More details for B0303XT-W2R2 can be seen below.