The L6739 from STMicroelectronics is a DC to DC Converter with Output Voltage 1 0.8 to 5 V, Output Current 1 30000 mA, Supply Voltage 5 to 12 V, Operating Temperature -40 to 125 Degree C, Storage Temperature -40 to 150 Degree C. Tags: Surface Mount, Buck/Step down. More details for L6739 can be seen below.