A high power density switched-capacitor DC-DC converter is disclosed. According to one aspect, the subject matter described herein includes a high power-density switched-capacitor DC-DC converter that includes: first and second voltage summing circuits, each voltage summing circuit producing an output voltage that is substantially equal to an input voltage; and a switching circuit connected between the first and second voltage summing circuits and configured to provide a DC voltage source as an input to the first and second voltage summing circuits, wherein the converter produces an output voltage that is the sum of the voltage produced by the first voltage summing circuit, the voltage provided by the DC voltage source, and the voltage produced by the second voltage summing circuit.