A 97.9% Peak Efficiency 9 v Output Three-Switch Hybrid Buck-Boost Power Stage Using 5 v CMOS

Hyunjin Kim, Taehyeong Park, Chulwoo Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

this paper, a three-switch hybrid buck-boost DC-DC converter is presented to achieve a high power conversion efficiency (PCE) with a high power density. The proposed power stage employs one inductor and one flying capacitor with three 5 V CMOS switches, generating a minimum of 1 V to a maximum output voltage of 9 V. In addition, the power switches use a constant gate-source voltage for both step-down and step-up turn-on operations, enhancing the converter to achieve a (a) PCE of over 85.6% at an output load current (I{\mathrm{OUT}}) of 1 A. The converter is implemented using a conventional voltage-mode type-III compensation circuit. In addition, the gate drivers use 5 V CMOS devices to drive the power switches with low fabrication costs. In this study, the prototype chip was designed and simulated in a 180 nm BCD process, and the peak efficiency was simulated to be 96.9% and 97.9% in the buck and boost modes, respectively, with a maximum I{\mathrm{OUT}} of 2 A.

Original languageEnglish
Title of host publicationMWSCAS 2022 - 65th IEEE International Midwest Symposium on Circuits and Systems, Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781665402798
DOIs
Publication statusPublished - 2022
Event65th IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2022 - Fukuoka, Japan
Duration: 2022 Aug 72022 Aug 10

Publication series

NameMidwest Symposium on Circuits and Systems
Volume2022-August
ISSN (Print)1548-3746

Conference

Conference65th IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2022
Country/TerritoryJapan
CityFukuoka
Period22/8/722/8/10

Keywords

  • DC-DC converter
  • RMS inductor current reduction
  • hybrid buck-boost converter
  • three-switch converter

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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