Fully-Integrated Switched-Capacitor Converter With Capacitor Bridging for Improved Current Density

A 6-phase, 3 interleaving cells bridged, fullyintegrated 1/4x switched-capacitor converter (SCC) is proposed. Two techniques, called capacitor bridging and phase expansion, are proposed and implemented in this SCC to solve the idling capacitor problem and reduce area overhead. The phase clamp technique is also proposed to solve the drain and source flipping issue. This brief was designed in 65 nm CMOS technology, and measurement results show that the current density is improved by 25% comparing to the traditional 3-phase 1/4x SCC without sacrificing efficiency.

Automated summary

This paper proposes a new 6-phase, 3 interleaving cells bridged, fully integrated 1/4x switched-capacitor converter (SCC) with improved current density. Capacitor bridging and phase expansion techniques are introduced to solve idle capacitor and area overhead issues. A phase clamp technique is also proposed to address drain and source flipping problems.