The 4V3.3D5 from AAK Corporation is a DC to DC Converter with Input Voltage 4 V, Output Voltage 1 3.3 V, Output Current 1 5 A, Output Power 80 W, Output Voltage 2 -3.3 V. Tags: Chassis Mount, Buck/Step down. More details for 4V3.3D5 can be seen below.