A high-accuracy and high-efficiency on-chip current sensing for current-mode control CMOS DC-DC buck converter

Kuo Hsing Cheng, Chia Wei Su, Hsin Hsin Ko

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

33 Scopus citations

Abstract

In this paper, a high accuracy, high efficiency, and wide current sensing range on chip current sensing technique is presented. The proposed current sensing circuit uses simple switch technique to achieve high accuracy. The current sensing circuit has no OP amplifier so that it would not reduce the power efficiency. The test chip is fabricated in TSMC 0.18μm 1P6M 3.3V CMOS process. The measurement results show that the buck converter with on-chip current sensing circuit can operate from 700KHz to 1.4MHz with supply voltage from 2.5 to 5 V for lithium ion battery application. The accuracy of proposed current sensing circuit is higher than 89.8% for load current from 50 to 500mA and for temperature from 0 to 100°C. The power efficiency of the buck converter is up to 91.2%.

Original languageEnglish
Title of host publicationProceedings of the 15th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2008
Pages458-461
Number of pages4
DOIs
StatePublished - 2008
Event15th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2008 - St. Julian's, Malta
Duration: 31 Aug 20083 Sep 2008

Publication series

NameProceedings of the 15th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2008

Conference

Conference15th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2008
Country/TerritoryMalta
CitySt. Julian's
Period31/08/083/09/08

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