The VTX-224-051-0522 from Vigortronix is a DC to DC Converter with Input Voltage 4.5 to 5.5 V, Output Voltage 1 9 V, Output Current 1 5.5 to 55 mA, Output Power 500 mW, Output Voltage 2 -9 V. Tags: Surface Mount, Buck-Boost. More details for VTX-224-051-0522 can be seen below.