MPQ4480 Step-Down Converters Monolithic Power Systems (MPS) MPQ4480 Step-Down Converters are high frequency and synchronous rectified switch mode converters. These converters feature synchronous mode operation for higher efficiency over the output load range. The MPQ4480 converters offer 6A output current with excellent load and line regulation. These converters feature fault condition protection that includes hiccup current limiting, OVP, and Thermal Shut-Down (TSD).