On-chip current sensing technique for CMOS monolithic switch-mode power converters

Author

Lee, Cheung Fai ; Mok, Philip K T

Author_Institution

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

Volume

5

fYear

2002

fDate

2002

Abstract

An on-chip current sensing technique, which is suitable for monolithic switch-mode power converters, is presented in this paper. This current sensing technique has been fabricated with a standard 0.6 μm CMOS process. Experimental results show that the switching converter can operate from 300 kHz to 1 MHz with the duty-ratio ranging from 0.2 to 1. The supply voltage of this current sensing circuit is from 3 V to 4.2 V, which is suitable for lithium ion battery applications. The discrepancy between the sensed signal and the inductor current is less than 4%, corresponding to 10 mA with load current 300 mA.

Keywords

CMOS analogue integrated circuits; DC-DC power convertors; power integrated circuits; switched mode power supplies; 0.6 micron; 10 mA; 3 to 4.2 V; 300 kHz to 1 MHz; 300 mA; CMOS; DC DC power convertors; duty-ratio; inductor current; lithium ion battery applications; load current; monolithic switch-mode power converters; on-chip current sensing technique; supply voltage; Batteries; CMOS technology; Circuits; Consumer electronics; Inductors; Power dissipation; Power transistors; Resistors; Switching converters; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on

Print_ISBN

0-7803-7448-7

Type

conf

DOI

10.1109/ISCAS.2002.1010691

Filename

1010691