The LTC3859AL from Analog Devices is a DC to DC Converter with Input Voltage 4.5 to 38 V, Output Voltage 1 0.8 V, Output Current 1 25000 mA, Operating Temperature -40 to 125 Degree C, Storage Temperature -65 to 150 Degree C. Tags: Surface Mount, Buck-Boost. More details for LTC3859AL can be seen below.