The BU90008GWZ from ROHM Semiconductor is a DC to DC Converter with Input Voltage 2.3 to 5.5 V, Output Voltage 1 0.98 to 1.02 V, Output Current 1 1000 mA, Operating Temperature -40 to 85 Degree C, Storage Temperature -55 to 150 Degree C. Tags: Surface Mount, Buck/Step down. More details for BU90008GWZ can be seen below.