The MA03-12S05 from Total Power International is a DC to DC Converter with Input Voltage 10.8 to 13.2 V, Output Voltage 1 5 V, Output Current 1 12 to 600 mA, Output Power 3000 mW, Operating Temperature -40 to 85 Degree C. Tags: Through Hole, Buck/Step down. More details for MA03-12S05 can be seen below.