NDLI: A High Efficiency Dual-Mode Buck Converter IC For Portable Applications

Content Provider	IEEE Xplore Digital Library
Author	Wan-Rone Liou Mei-Ling Yeh Yueh Lung Kuo
Copyright Year	1986
Abstract	This paper presents the design of a novel wide output current range dual-mode dc to dc step-down (Buck) switching regulator/converter. The converter can adaptively switch between pulsewidth modulation (PWM) and pulse-frequency modulation (PFM) both with very high conversion efficiency. Under light load condition the converter enters PFM mode. The function of closing internal idle circuits is implemented to save unnecessary switching losses. The converter can be switched to PWM mode when the load current is greater than 100 mA. Soft start operation is designed to eliminate the excess large current at the start up of the regulator. The chip has been fabricated with a TSMC 2P4M 0.35 mum polycide CMOS process. The range of the operation voltage is from 2.7 to 5 V, which is suitable for single-cell lithium-ion battery supply applications. The maximum conversion efficiency is 95% at 50 mA load current. Above 85 % conversion efficiency can be reached for load current from 3 to 460 mA.
Sponsorship	IEEE Power Electronics Society
Starting Page	667
Ending Page	677
Page Count	11
File Size	2549464
File Format	PDF
ISSN	08858993
Volume Number	23
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Buck converters Application specific integrated circuits Pulse width modulation converters Pulse width modulation Switching converters Regulators Switches Switching loss CMOS process Voltage pulsewidth modulation (PWM) Buck converter dual-mode converter integrated power management pulse-frequency modulation (PFM)
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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