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

doi:10.1109/JSSC.2024.3404597

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 journal › Article › peer-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 (V_OUT) 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 V_OUT 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 language	English
Pages (from-to)	3444-3456
Number of pages	13
Journal	IEEE Journal of Solid-State Circuits
Volume	59
Issue number	10
DOIs	https://doi.org/10.1109/JSSC.2024.3404597
Publication status	Published - 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

Access to Document

10.1109/JSSC.2024.3404597

Cite this

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

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.",

keywords = "Conversion-ratio modulation (CRM), Internet of Things, dc-dc converter, reconfigurable converter, switched-capacitor converter, voltage conversion ratio (VCR)",

author = "Hyunjin Kim and Taehyeong Park and Inho Park and Changhun Park and Seokjin Kim and Seokhee Han and Junwon Jeong and Chulwoo Kim",

note = "Publisher Copyright: {\textcopyright} 1966-2012 IEEE.",

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AU - Park, Taehyeong

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AU - Park, Changhun

AU - Kim, Seokjin

AU - Han, Seokhee

AU - Jeong, Junwon

AU - Kim, Chulwoo

PY - 2024

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N2 - 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.

AB - 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.

KW - Conversion-ratio modulation (CRM)

KW - Internet of Things

KW - dc-dc converter

KW - reconfigurable converter

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KW - voltage conversion ratio (VCR)

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

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

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