The AP64303QFVBW-13 from Diodes Incorporated is a DC to DC Converter with Input Voltage 3.8 to 40 V, Output Voltage 1 0.8 to 36 V, Output Current 1 3.0 A, Supply Voltage -0.3 to 55 V, Operating Temperature -40 to 125 Degree C. Tags: Surface Mount, Buck/Step down. More details for AP64303QFVBW-13 can be seen below.