The PM6641 from STMicroelectronics is a DC to DC Converter with Input Voltage 2.7 to 5.5 V, Output Voltage 1 0.8 to 2.5 V, Output Current 1 2500 mA, Operating Temperature -40 to 125 Degree C, Storage Temperature -50 to 150 Degree C. Tags: Surface Mount, Buck/Step down. More details for PM6641 can be seen below.