A Fully Integrated Nine-Ratio Switched-Capacitor Converter With Overlapped-Conversion-Ratio Modulation for IoT Applications

Hyunjin Kim, Taehyeong Park, Inho Park, Changhun Park, Seokjin Kim, Seokhee Han, Junwon Jeong, Chulwoo Kim

Research output: Contribution to journalArticlepeer-review

Abstract

This article presents a fully integrated step-down switched-capacitor (SC) converter with nine voltage conversion ratios (VCRs) that regulates an output load voltage (VOUT) of 0.1-3.67 V with an input voltage of 2.5-5 V. The proposed converter employs 5-V metal-insulator-metal capacitors and 1.8-V native MOSFET capacitors to achieve both power density and conversion efficiency that are suitable for the Internet-of-Things (IoT) applications. In addition, the power stage is operated by the proposed overlapped-conversion-ratio modulation (OCRM), which prevents the severe closed-loop efficiency loss caused by conventional VCR control schemes. Thus, the proposed converter regulates VOUT through digitally controlled 15 nine-ratio SC cells, enabling the frequency-scalable power conversion operation. With a 180-nm CMOS process, the proposed converter achieves 87% peak efficiency and the maximum output power of 421 mW.

Original languageEnglish
Pages (from-to)3444-3456
Number of pages13
JournalIEEE Journal of Solid-State Circuits
Volume59
Issue number10
DOIs
Publication statusPublished - 2024

Bibliographical note

Publisher Copyright:
© 1966-2012 IEEE.

Keywords

  • Conversion-ratio modulation (CRM)
  • Internet of Things
  • dc-dc converter
  • reconfigurable converter
  • switched-capacitor converter
  • voltage conversion ratio (VCR)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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