The R1243 from Ricoh Electronic Devices is a DC to DC Converter with Input Voltage 4.5 to 30 V, Output Voltage 1 0.8 to 18 V, Output Current 1 2000 mA, Operating Temperature -40 to 85 Degree C, Storage Temperature -55 to 125 Degree C. Tags: Surface Mount, Buck/Step down. More details for R1243 can be seen below.