The R1287 from Ricoh Electronic Devices is a DC to DC Converter with Input Voltage 2.5 to 5.5 V, Output Voltage 1 4.5 to 5.8 V, Output Current 1 200 mA, Operating Temperature -40 to 85 Degree C, Storage Temperature -55 to 125 Degree C. Tags: Surface Mount, Boost/Step Up, Buck/Step down. More details for R1287 can be seen below.