A high efficiency adaptive frequency hopping controlled 1/3× step-down switch capacitor DC-DC converter with deep-green mode operation

Da Long Ming*, Yu Huei Lee, Ke-Horng Chen

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

5 Scopus citations

Abstract

A high efficiency adaptive frequency hopping (AFH) controlled step-down switch capacitor (SC) DC-DC converter with deep-green mode (DGM) operation is proposed for system-on-chip (SoC) applications. To obtain the high power conversion efficiency and the small output voltage ripple over a wide load current range, the proposed driving capability control can modulate the load current driving with the closed-loop operation. The AFH control can dynamically adjust the switching frequency according to the distinct output load conditions, so as to ensure adequate load current supply function as well as output voltage regulation. In addition, the DGM operation can mask the switching clock to reduce power loss at ultra light loads for improving power efficiency. This work is implemented by 40 nm CMOS technology. Simulated results demonstrate that the propped SC converter delivers wide load range from 1mA to 300mA. The power conversion efficiency is achieved over 72 % and the output voltage ripple is guaranteed smaller than 30 mV.

Original languageEnglish
Pages966-969
Number of pages4
DOIs
StatePublished - 28 Sep 2012
Event2012 IEEE International Symposium on Circuits and Systems, ISCAS 2012 - Seoul, Korea, Republic of
Duration: 20 May 201223 May 2012

Conference

Conference2012 IEEE International Symposium on Circuits and Systems, ISCAS 2012
CountryKorea, Republic of
CitySeoul
Period20/05/1223/05/12

Keywords

  • adaptive frequency hopping (AFH) control
  • deep green mode (DGM)
  • SoC system
  • switch capacitor (SC) converter

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