Demonstration circuit DC1043A-C features four LTM4601EV high efficiency, high density switch mode step-down power modules in parallel (the LTM4601-1 can be substituted for the slave devices). The input voltage range is from 5.0V to 20V. The output voltage is programmable from 0.6V to 3.3V; refer to step down ratio curve in the LTM4601 datasheet. The rated load current is 40A, while de-rating is necessary for certain VIN, VOUT, and thermal conditions. Master module U1 provides differential remote sensing to accurately regulate output voltage independent of load current. Integrated input and output filters enable a simple PCB layout. Only bulk input and output capacitors are needed externally.