The ST2S08B from STMicroelectronics is a DC to DC Converter with Input Voltage 3 to 5.5 V, Output Voltage 1 0.8 to 4.675 V, Output Current 1 1500 mA, Operating Temperature 150 Degree C, Storage Temperature -65 to 150 Degree C. Tags: Surface Mount, Buck/Step down. More details for ST2S08B can be seen below.