An integrated CMOS current-sensing circuit for low-Voltage current-mode buck regulator

Author

Leung, Chi Yat ; Mok, Philip K T ; Leung, Ka Nang ; Chan, Mansun

Author_Institution

Dept. of Electr. & Electron. Eng., Hong Kong Univ. of Sci. & Technol., China

Volume

52

Issue

7

fYear

2005

fDate

7/1/2005 12:00:00 AM

Firstpage

394

Lastpage

397

Abstract

An integrated current-sensing circuit for low-voltage buck regulator is presented. The minimum achievable supply voltage of the proposed current-sensing circuit is 1.2 V implemented in a CMOS technology with V_TH=0.85 V, and the current-sensing accuracy is higher than 94%. With the developed current-sensing circuit, a buck regulator, which is able to operate at a 1.2-V supply, is implemented. A maximum output current of 120 mA and power-conversion efficiency higher than 89% are achieved.

Keywords

CMOS integrated circuits; DC-DC power convertors; current-mode circuits; low-power electronics; switched mode power supplies; 0.85 V; 1.2 V; 120 mA; CMOS integrated circuits; dc-dc converter; integrated CMOS current-sensing circuit; low-voltage current mode buck regulator; switched-mode power converter; CMOS technology; Circuit stability; Dynamic voltage scaling; Inductors; Integrated circuit technology; Pulse width modulation; Regulators; Switching converters; Voltage control; Voltage-controlled oscillators; Closed-loop stability; current-mode buck regulator; dc–dc converter; low-voltage current-sensing circuit; on-chip current-sensing circuit; switched-mode power converter;

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2005.850403

Filename

1468338