The LT3845A from Analog Devices is a DC to DC Converter with Input Voltage 4 to 60 V, Output Voltage 1 1.231 to 36 V, Output Current 1 15000 mA, Operating Temperature -55 to 125 Degree C, Storage Temperature -65 to 150 Degree C. Tags: Surface Mount, Buck/Step down. More details for LT3845A can be seen below.