Enhancing Driving Capability of On-Chip Switched Capacitor-Based Converter Using High-Speed NRTI Switching Scheme

In this paper, we present an On-chip switched capacitor-based DC-DC buck converter topology for embedded applications, providing very high driving capability maintaining high efficiency and low output ripple. The Converter is constructed using multiple identical units controlled by high-speed non-overlapping rotational time interleaving (NRTI) switching signals. A prototype converter has been designed in 65nm CMOS Process to get 1.15 V output from 2.5 V input supply with a driving capability of 230 mA maximum load current. This converter containing ten identical units delivers a peak efficiency of 81.35% using a total 1.55nF capacitor and output ripple below 14 mV.