A Highly Integrated 3-Phase 4:1 Resonant Switched-Capacitor Converter With Parasitic Loss Reduction and Fast Pre-Charge Startup.

This brief proposes a highly-integrated 3-phase ($3\boldsymbol{\Phi }$) 4:1 resonant switched-capacitor (ReSC) converter with parasitic capacitor soft charging for Internet-of-Things devices, reducing the current stress at the point of load. Both the $3\boldsymbol{\Phi }$ resonant operation and the parasitic loss reduction schemes improve the power conversion efficiency. Also, this $3\boldsymbol{\Phi }$ -ReSC converter implements a flying capacitor pre-charge scheme to guarantee a safe startup. The chip, fabricated in a 65-nm CMOS process, occupies a silicon area of 1.39 mm2. We achieve a peak efficiency of 85.5% and a maximum output current of 130mA, in a mm-sized solution, with an input range of 2.3 V – 2.5 V. [ABSTRACT FROM AUTHOR]