The PUB0303S2B from Flex Power Modules is a DC to DC Converter with Input Voltage 2.97 to 3.63 V, Output Voltage 1 3.3 V, Output Current 1 0.61 A, Output Power 2000 mW, Isolation Voltage 4000 Vdc. Tags: Through Hole, Buck-Boost. More details for PUB0303S2B can be seen below.