A dual mode high efficiency buck DC-DC converter

Author

Gong, Xu ; Jiang, Jinguang ; Zhou, Xifeng ; Yuan, Zhongzhi

Author_Institution

Dept. of Phys. Sci. & Technol., Wuhan Univ., Wuhan, China

fYear

2011

fDate

25-28 Oct. 2011

Firstpage

838

Lastpage

842

Abstract

This paper proposes a pulse width modulation-pulse skipping modulation (PWM-PSM) dual mode control and high efficiency buck dc-dc converter with 91.7% peak efficiency. A simple but steady PWM-PSM automatic switching module is proposed to improve the conversion efficiency when the load is light and synchronous rectifier is used to boost the conversion efficiency when the load is heavy. At the same time, a new saw tooth waveform generator is proposed to suit both the PWM and PSM. The dc-dc converter has been realized with a 0.18μm TSMC mixed-signal CMOS process and operates at 100 KHz with supply voltage from 4.5V to 5.5V which is the voltage range of USB interface. Measured conversion efficiency is over 80% for load current from 10mA to 600mA when the input voltage is 5V and output voltage is 3.3V.

Keywords

CMOS integrated circuits; DC-DC power convertors; PWM power convertors; rectifiers; waveform generators; PWM-PSM automatic switching module; PWM-PSM dual mode control; TSMC mixed-signal CMOS process; USB interface; conversion efficiency; current 10 mA to 600 mA; dual mode high efficiency buck DC-DC converter; efficiency 91.7 percent; frequency 100 kHz; pulse width modulation-pulse skipping modulation dual mode control; saw tooth waveform generator; size 0.18 mum; synchronous rectifier; voltage 3.3 V; voltage 4.5 V to 5.5 V; CMOS integrated circuits; CMOS technology; Generators; Logic gates; Pulse width modulation; Switches;

fLanguage

English

Publisher

ieee

Conference_Titel

ASIC (ASICON), 2011 IEEE 9th International Conference on

Conference_Location

Xiamen

ISSN

2162-7541

Print_ISBN

978-1-61284-192-2

Electronic_ISBN

2162-7541

Type

conf

DOI

10.1109/ASICON.2011.6157335

Filename

6157335