The PH100A280-3.3 from TDK Corporation is a DC to DC Converter with Input Voltage 2.97 to 3.96 V, Output Voltage 1 3.3 V, Output Current 1 20000 mA, Output Power 66000 mW, Operating Temperature -40 to 85 Degree C. Tags: Through Hole, Buck-Boost. More details for PH100A280-3.3 can be seen below.