The TRN 3-0521SM from Traco Power is a DC to DC Converter with Input Voltage 4.5 to 13.2 V, Output Voltage 1 5 V, Output Current 1 0.3 A, Output Power 3 W, Output Voltage 2 -5 V. Tags: Surface Mount, Buck-Boost. More details for TRN 3-0521SM can be seen below.