A highly power-efficient single-inductor multiple-outputs (SIMO) DC-DC converter with gate charge sharing method

Ki Soo Nam, Whan Seok Seo, Hyun A. Ahn, Young Ho Jung, Seong Kwan Hong, Oh Kyong Kwon

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

This paper proposes a highly powerefficient single-inductor multiple-outputs (SIMO) DCDC converter with a gate charge sharing method in which gate charges of output switches are shared to improve the power efficiency and to reduce the switching power loss. The proposed converter was fabricated by using a 0.18 μm CMOS process technology with high voltage devices of 5 V. The input voltage range of the converter is from 2.8 V to 4.2 V, which is based on a single cell lithium-ion battery, and the output voltages are 1.0 V, 1.2 V, 1.8 V, 2.5 V, and 3.3 V. Using the proposed gate charge sharing method, the maximum power efficiency is measured to be 87.2% at the total output current of 450 mA. The measured power efficiency improved by 2.1% compared with that of the SIMO DC-DC converter without the proposed gate charge sharing method.

Original languageEnglish
Pages (from-to)549-556
Number of pages8
JournalJournal of Semiconductor Technology and Science
Volume14
Issue number5
DOIs
StatePublished - 2014 Oct 1

Keywords

  • Charge sharing
  • DC-DC converter
  • Power efficiency
  • Single inductor multiple outputs (SIMO)
  • Switching power loss

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