1.5V continuous-tracking current sensing circuit with high accuracy for DC-DC buck converter

Author

Chung, Shuo-Lin ; Weng, Ro-Min

Author_Institution

Dept. of Electr. Eng., Nat. Dong Hwa Univ., Hualien, Taiwan

fYear

2010

Firstpage

147

Lastpage

149

Abstract

A low voltage current sensing circuit is presented in this paper. The proposed current sensing circuit performs continuous-tracking with high accuracy over 98% is achieved. The current sensing circuit is implemented with a standard 0.18μm CMOS process at 1.5V supply voltage. The power efficiency obtains 89% over the maximum load current of 540mA. Wide operation frequency range from 400kHz to 25MHz speeds up the tracking time. Off-chip inductors and capacitors can effectively decrease the voltage ripple. Area efficiency brings the benefit of low cost to the proposed current sensing circuit.

Keywords

CMOS analogue integrated circuits; DC-DC power convertors; capacitors; electric sensing devices; inductors; low-power electronics; CMOS process; DC-DC buck converter; capacitor; continuous-tracking current sensing circuit; current 540 mA; frequency 400 kHz to 25 MHz; low voltage current sensing circuit; off-chip inductor; size 0.18 mum; voltage 1.5 V; voltage ripple; Accuracy; CMOS integrated circuits; buck converter; current mode; current sensing circuit;

fLanguage

English

Publisher

ieee

Conference_Titel

Next-Generation Electronics (ISNE), 2010 International Symposium on

Conference_Location

Kaohsiung

Print_ISBN

978-1-4244-6693-1

Type

conf

DOI

10.1109/ISNE.2010.5669176

Filename

5669176