The SRS-0509 from Mean Well is a DC to DC Converter with Input Voltage 4.5 to 5.5 V, Output Voltage 1 9 V, Output Current 1 0 to 56 mA, Output Power 500 mW, Operating Temperature -25 to 71 Degree C. Tags: Through Hole, Boost/Step Up. More details for SRS-0509 can be seen below.