The BD91501MUV from ROHM Semiconductor is a DC to DC Converter with Input Voltage 2.55 to 5.5 V, Output Voltage 1 1.8 V, Output Current 1 300 mA, Output Voltage 2 2.55 V, Output Current 2 400 mA. Tags: Surface Mount, Buck/Step down. More details for BD91501MUV can be seen below.