The EC3A04MS from Cincon Electronics is a DC to DC Converter with Input Voltage 4.5 to 6 V, Output Voltage 1 -5 to 5 V, Output Current 1 -300 to 300 mA, Output Power 3000 mW, Isolation Voltage 500 V. Tags: Through Hole, Buck-Boost. More details for EC3A04MS can be seen below.