The LT8709 from Analog Devices is a DC to DC Converter with Input Voltage -80 to -4.5 V, Output Voltage 1 1.234 to 80 V, Output Current 1 25000 mA, Operating Temperature -40 to 125 Degree C, Storage Temperature -65 to 150 Degree C. Tags: Surface Mount, Buck/Step down. More details for LT8709 can be seen below.