The ACT4533B from Qorvo is a DC to DC Converter with Input Voltage 10 to 38 V, Output Voltage 1 12 V, Output Current 1 3500 mA, Operating Temperature -40 to 85 Degree C, Storage Temperature -55 to 150 Degree C. Tags: Surface Mount, Buck/Step down. More details for ACT4533B can be seen below.