The RP601 from Ricoh Electronic Devices is a DC to DC Converter with Input Voltage 2.3 to 5.5 V, Output Voltage 1 2.75 to 4.2 V, Output Current 1 1000 mA, Operating Temperature -40 to 85 Degree C, Storage Temperature -55 to 125 Degree C. Tags: Surface Mount, Buck-Boost. More details for RP601 can be seen below.