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

Author

Liou, Wan-Rone ; Chen, Tsung-Hsing ; Kuo, Yueh-Lung ; Huang, Tang-Yu ; Yeh, Mei-Ling

Author_Institution

Nat. Taipei Univ., Sanhsia

fYear

2007

Firstpage

1011

Lastpage

1015

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 pulse-width modulation (PWM) and pulse-frequency modulation (PFM) both with very high conversion efficiency. 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 mu m polycide CMOS process. The range of the operation voltage is from 2.7 V 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.

Keywords

DC-DC power convertors; integrated circuits; power supply circuits; CMOS process; dual-mode DC to DC step-down switching regulator/converter; pulse-frequency modulation; pulse-width modulation; single-cell lithium-ion battery; Application specific integrated circuits; Batteries; Buck converters; CMOS process; Pulse width modulation; Pulse width modulation converters; Regulators; Switches; Switching converters; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, Circuits and Systems, 2007. ICCCAS 2007. International Conference on

Conference_Location

Kokura

Print_ISBN

978-1-4244-1473-4

Type

conf

DOI

10.1109/ICCCAS.2007.4348218

Filename

4348218