Triple-mode switched-inductor-capacitor DC-DC buck converter with reusable flying capacitor and bang-bang zero-current detector for wide load current range

Jongbeom Baek, Hyung Min Lee, Se Un Shin

Research output: Contribution to journalArticlepeer-review

Abstract

Although the capacity of a battery with a small form factor is extremely low, demand for long usage time of Internet of Things (IoT) products is increasing. Owing to this limitation of the battery, power management integrated circuits (PMICs) are used for extending the battery usage time with high efficiency. In particular, since IoT devices are mostly in the sleep mode in the idle state, PMICs should achieve high efficiency for ultralight loads in the sleep mode as well as for heavy loads in the active mode. In this paper, an accurate bang-bang zero-current detector (to prevent a reverse inductor current) and a triple-mode switched inductor-capacitor dc-dc buck converter with a reusable flying capacitor are presented; these techniques can maintain high efficiency over a wide load current range. The proposed buck converter was fabricated in a 0.18-µm 1P4M CMOS process. A power conversion efficiency exceeding 85% was achieved in the load range of 100 µA to 300 mA.

Original languageEnglish
Article number1202
Pages (from-to)1-11
Number of pages11
JournalElectronics (Switzerland)
Volume9
Issue number8
DOIs
Publication statusPublished - 2020 Aug

Keywords

  • Buck converter
  • Discontinuous conduction mode
  • Flying capacitor
  • Power management integrated circuits
  • Zero-current detector

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Signal Processing
  • Hardware and Architecture
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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