A Fully-Integrated 6:1 Cascaded Switched-Capacitor DC-DC Converter Achieving 74% Efficiency at 0.1W/mm²

This paper introduces a cascading technique for monolithic switched-capacitor DC-DC converters with a high voltage conversion step. With this technique, the converter is divided into subconverters, each with a low voltage rating. This enables the use of MOS instead of MIM/MOM capacitors, leading to high efficiencies and power densities thanks to the superior MOS capacitance density. A 6:1 cascade topology that converts an input voltage of 7.25 V into an output voltage of 1 V, is implemented in a standard 90 nm CMOS technology. The simulated converter achieves an efficiency of 74.2% at a power density of 0.1 W/mm². As a result, the proposed design achieves the best high-density figure of merit compared to the state-of-the-art.

ISBN:978-1-7281-3549-6

Publication year:2019

BOF-keylabel:yes

IOF-keylabel:yes

Authors from:Higher Education