The L4974A from STMicroelectronics is a DC to DC Converter with Input Voltage 15 to 50 V, Output Voltage 1 5.1 to 40 V, Output Current 1 4000 mA, Operating Temperature -40 to 150 Degree C, Storage Temperature -40 to 150 Degree C. Tags: Surface Mount, Buck/Step down. More details for L4974A can be seen below.