The BD9109FVM from ROHM Semiconductor is a DC to DC Converter with Input Voltage 4.5 to 5.5 V, Output Voltage 1 3.3 V, Output Current 1 800 mA, Operating Temperature -25 to 85 Degree C, Storage Temperature -55 to 150 Degree C. Tags: Surface Mount, Buck/Step down. More details for BD9109FVM can be seen below.