Optimization and Comparison of Hybrid-Resonant Switched Capacitor DC-DC Converter Topologies

This paper explores methods to optimize and compare a variety of switched-capacitor (SC) DC-DC topologies that can be operated in a resonant mode. A figure of merit is developed that is a proxy for minimum achievable power loss, based on conduction and frequency-dependent losses in the active semiconductor components. Similar to past work on pure SC converters, the method leverages a charge-multiplier approach and is used to show the impact of energy or area constraints on capacitors, and tradeoffs between power loss and volumetric overhead of inductors. An analysis and detailed breakdown is provided for several common and emerging topologies.