Merged two-stage power converter with soft charging switched-capacitor stage in 180 nm CMOS

Robert C.N. Pilawa-Podgurski, David J. Perreault

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, we introduce a merged two-stage dc-dc power converter for low-voltage power delivery. By separating the transformation and regulation function of a dc-dc power converter into two stages, both large voltage transformation and high switching frequency can be achieved. We show how the switched-capacitor stage can operate under soft charging conditions by suitable control and integration (merging) of the two stages. This mode of operation enables improved efficiency and/or power density in the switched-capacitor stage. A 5-to-1 V, 0.8 W integrated dc-dc converter has been developed in 180 nm CMOS. The converter achieves a peak efficiency of 81%, with a regulation stage switching frequency of 10 MHz.

Original languageEnglish (US)
Article number6193182
Pages (from-to)1557-1567
Number of pages11
JournalIEEE Journal of Solid-State Circuits
Volume47
Issue number7
DOIs
StatePublished - 2012

Keywords

  • Buck converter
  • CMOS power delivery
  • DC-DC converter
  • feed-forward
  • merged two-stage
  • power management
  • soft charging
  • switched capacitor converter

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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