The RP402 from Ricoh Electronic Devices is a DC to DC Converter with Input Voltage 0.6 to 4.8 V, Output Voltage 1 1.8 to 5.5 V, Operating Temperature -40 to 85 Degree C, Storage Temperature -55 to 125 Degree C. Tags: Surface Mount, Boost/Step Up. More details for RP402 can be seen below.