A 1-V input, 0.2-V to 0.47-V output switched-capacitor DC-DC converter with pulse density and width modulation (PDWM) for 57% ripple reduction

Research output: Contribution to book/conference proceedings/anthology/report › Conference contribution › Contributed › peer-review

Contributors

  • Xin Zhang - , Chair of Physical Chemistry, Tokyo University of Agriculture (Author)
  • Yu Pu - , Tokyo University of Agriculture (Author)
  • Koichi Ishida - , Chair of Circuit Design and Network Theory, Tokyo University of Agriculture (Author)
  • Yoshikatsu Ryu - , Semiconductor Technology Academic Research Center (STARC) (Author)
  • Yasuyuki Okuma - , Semiconductor Technology Academic Research Center (STARC) (Author)
  • Po-Hung Chen - , Tokyo University of Agriculture (Author)
  • Kazunori Watanabe - , Semiconductor Technology Academic Research Center (STARC) (Author)
  • Takayasu Sakurai - , Tokyo University of Agriculture (Author)
  • Makoto Takamiya - , Tokyo University of Agriculture (Author)

Abstract

To effectively reduce output ripple of switched-capacitor DC-DC converters which generate variable output voltages, a novel feedback control scheme is presented. The proposed scheme uses pulse density and width modulation (PDWM) to reduce the output ripple with low output voltage. The prototype chip was implemented using 65nm CMOS process. The switched-capacitor DC-DC converter has 0.2-V to 0.47-V output voltage and delivers 0.25-mA to 10-mA output current from a 1-V input supply with a peak efficiency of 87%. Compared with the conventional pulse density modulation (PDM), the proposed switched-capacitor DC-DC converter with PDWM reduces the output ripple by 57% in the low output voltage region with the efficiency penalty of 2%.

Details

Original languageEnglish
Title of host publication2010 IEEE Asian Solid-State Circuits Conference
PublisherIEEE
Pages1-4
Number of pages4
ISBN (print)978-1-4244-8298-6
Publication statusPublished - 10 Nov 2010
Peer-reviewedYes

Conference

Title2010 IEEE Asian Solid-State Circuits Conference
Duration8 - 10 November 2010
LocationBeijing, China

External IDs

Scopus 79952857246
ORCID /0000-0002-4152-1203/work/165453409

Keywords

Keywords

  • Converters, Switches, Clocks, Capacitors, Switching circuits, Voltage measurement, Current measurement