The PM8903A from STMicroelectronics is a DC to DC Converter with Input Voltage 2.8 to 6 V, Output Voltage 1 0.6 to 3.6 V, Output Current 1 3000 mA, Operating Temperature -25 to 125 Degree C, Storage Temperature -40 to 150 Degree C. Tags: Surface Mount, Buck/Step down. More details for PM8903A can be seen below.