The MAXM38643 from Analog Devices is a DC to DC Converter with Input Voltage 1.8 to 5.5 V, Output Voltage 1 0.7 to 3.3 V, Output Current 1 600 mA, Operating Temperature -40 to 85 Degree C, Storage Temperature -65 to 150 Degree C. Tags: Surface Mount, Buck/Step down. More details for MAXM38643 can be seen below.