The R1810 from Ricoh Electronic Devices is a DC to DC Converter with Input Voltage 0.35 to 2.1 V, Output Voltage 1 2.3 to 4.5 V, Operating Temperature -40 to 85 Degree C, Storage Temperature -55 to 125 Degree C. Tags: Surface Mount, Boost/Step Up. More details for R1810 can be seen below.