The ST1S12XX from STMicroelectronics is a DC to DC Converter with Input Voltage 2.5 to 5.5 V, Output Voltage 1 0.6 to 5 V, Output Current 1 700 mA, Operating Temperature -40 to 150 Degree C, Storage Temperature -65 to 150 Degree C. Tags: Surface Mount, Buck/Step down. More details for ST1S12XX can be seen below.