The AP64501Q from Diodes Incorporated is a DC to DC Converter with Input Voltage 3.8 to 40 V, Output Voltage 1 0.8 V, Output Current 1 5000 mA, Operating Temperature -40 to 125 Degree C, Storage Temperature -65 to 150 Degree C. Tags: Surface Mount, Buck/Step down. More details for AP64501Q can be seen below.