Compact dual output point of load converter based on the PM6680 step-down controller

This application note demonstrates the performance of the PM6680 dual step-down controller by implementing a two output point of load converter in a small PCB footprint. Utilizing constant on-time architecture and featuring a no-audio skip mode of operation, a common bus voltage that ranges between 10Vdc to 16Vdc is converted to 1.0Vdc at 10.5A and 1.8Vdc at 2.5A for a total output power level of 15W. The unique no-audio skip feature significantly improves efficiency at light load. Using surface-mount components on both the top and bottom of the circuit board and featuring ceramic output capacitors, the area needed for the converter measures only 1.0 inches x 1.25 inches (25.4mm x 37.75mm). The method for component value dimensioning is described along with the schematic and construction details. Typical efficiencies and functional test data are also presented.

View the PDF document for more information.