The BD90521EFV-C from ROHM Semiconductor is a DC to DC Converter with Input Voltage 2.6 to 5.5 V, Output Voltage 1 0.6 to 5 V, Output Current 1 2000 mA, Operating Temperature -40 to 125 Degree C, Storage Temperature -55 to 150 Degree C. Tags: Surface Mount, Buck/Step down. More details for BD90521EFV-C can be seen below.