The RP504 from Ricoh Electronic Devices is a DC to DC Converter with Input Voltage 2.3 to 5.5 V, Output Voltage 1 0.8 to 3.3 V, Output Current 1 600 mA, Operating Temperature -40 to 125 Degree C, Storage Temperature -55 to 125 Degree C. Tags: Surface Mount, Buck/Step down. More details for RP504 can be seen below.