The MAX1688 from Analog Devices is a DC to DC Converter with Input Voltage 2.7 to 6 V, Output Voltage 1 1.25 to 6 V, Output Current 1 2500 mA, Operating Temperature -40 to 85 Degree C, Storage Temperature -65 to 150 Degree C. Tags: Surface Mount, Buck/Step down. More details for MAX1688 can be seen below.