[K-9] Advanced Device-based Circuits and Power Management Systems

[K-9-06] Fully Integrated Switched-Capacitor Buck Converter with Variable Ratio and Frequency Controllers for Ultra-Low Power LSI Systems

〇Ryo Matsuzuka¹, Tetsuya Hirose¹, Shuto Kanzaki², Kaori Matsumoto¹, Nobutaka Kuroki², Masahiro Numa², Daisuke Kanemoto¹ (1. Osaka Univ. (Japan), 2. Kobe Univ. (Japan))

Presentation style: On-site (in-person)

https://doi.org/10.7567/SSDM.2022.K-9-06

This paper presents a switched-capacitor (SC) buck converter with a variable ratio and frequency controllers. The variable ratio controller monitors an input voltage and then changes the step-down ratio of the SC converter, enabling the converter to operate with a wide range of input voltage. The frequency controller changes a frequency in accordance with the load current for highly efficient power conversion. Measurements of a prototype chip demonstrated that our SC buck converter achieved a high efficiency of 84%.