A hybrid DC-DC converter capable of supplying heavy load in step-up and step-down mode

Jinwoo Jeon, Junyoung Maeng, Inho Park, Hyunjin Kim, Chulwoo Kim

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

2 Citations (Scopus)

Abstract

This paper proposes a hybrid DC-DC converter with a new power switch structure and its operating principles. Its main application is a power management IC that supplies compact mobile devices with a low-profile chip inductor, whose DC resistance is relatively high. In step-down mode, DC current flowing through the inductor is reduced by introducing a flying capacitor that assists load current at a certain phase. In step-up mode, average inductor current is smaller than the load current because of power-input power-output equation. A three-phase mode is also added to fill output voltage gap between step-up and step-down modes. By reducing inductor conduction loss, this work shows better power conversion efficiency than a conventional buck converter at heavy load. Using 180 nm general purpose process, the proposed converter takes 2.5 V input and supplies output in between 1.4 V and 5 V. Load current ranges in between 0.3 A and 1.5 A with peak power conversion efficiency of 92.87%.

Original languageEnglish
Title of host publication2021 IEEE International Symposium on Circuits and Systems, ISCAS 2021 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728192017
DOIs
Publication statusPublished - 2021
Event53rd IEEE International Symposium on Circuits and Systems, ISCAS 2021 - Daegu, Korea, Republic of
Duration: 2021 May 222021 May 28

Publication series

NameProceedings - IEEE International Symposium on Circuits and Systems
Volume2021-May
ISSN (Print)0271-4310

Conference

Conference53rd IEEE International Symposium on Circuits and Systems, ISCAS 2021
Country/TerritoryKorea, Republic of
CityDaegu
Period21/5/2221/5/28

Keywords

  • Chip inductor
  • Heavy load current
  • Hybrid DC-DC converter
  • Inductor DC resistance
  • Low-profile
  • Power conversion efficiency
  • Step-down
  • Step-up

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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