The LTC1873 from Analog Devices is a DC to DC Converter with Input Voltage 2.7 to 7 V, Output Voltage 1 1.3 V, Output Current 1 25000 mA, Operating Temperature -40 to 85 Degree C, Storage Temperature -65 to 150 Degree C. Tags: Surface Mount, Buck/Step down. More details for LTC1873 can be seen below.