The VTX-224-053-0521 from Vigortronix is a DC to DC Converter with Input Voltage 4.5 to 5.5 V, Output Voltage 1 5 V, Output Current 1 10 to 100 mA, Output Power 500 mW, Output Voltage 2 -5 V. Tags: Surface Mount, Buck-Boost. More details for VTX-224-053-0521 can be seen below.