Multistack Switched-Capacitor Architecture with Coupled Magnetics for 48V-to-1V VRM

This paper presents the design and analysis of a family of multistack switched-capacitor architecture and coupled magnetics for 48 V-to-l V point-of-load voltage regulation mod-ules (VRMs). The architecture uses multiple stages of unregulated switched-capacitor cells to generate multiple layers of cascaded terminals with reduced voltage levels. The reduced voltage levels are loaded by switched-mode power converters controlled as current sources to perform voltage regulation and soft charging. Switches of the switched-capacitor cells and the current source cells are merged to reduce the component count and improve the performance. The magnetic components in the current source cells are coupled and combined. The effectiveness of the topology family is verified by simulation and experimental results.