Title :
A high efficiency CMOS DC-DC boost converter with current sensing feedback
Author :
Jung, Kyungsoo ; Lim, Jinup ; Park, Jongmin ; Yang, Huikwan ; Cha, Sanghyun ; Choi, Joongho
Author_Institution :
Dept. of Electr. & Comput. Eng., Seoul Univ.
Abstract :
This paper presents a high efficiency CMOS DC-DC boost converter with current sensing feedback. The internal 500 kHz oscillator for switching operation is used to make set control signal in pulse-width modulation topology. To sense the amount of current through the inductor, the high accuracy current copy circuit using operational amplifier is included. The load regulation is 11.5%/A with compensation scheme that increases the feedback loop gain and accuracy of the output voltage. To guarantee the stability of the converter, the artificial ramp signal is used. The measurement results show that the efficiency is up to 90.7% with 2.2 V input and 220 mA load current for 3.3V output. This converter is fabricated in 0.18-mum CMOS standard technology with thick gate oxide option
Keywords :
CMOS integrated circuits; DC-DC power convertors; microwave oscillators; operational amplifiers; 0.18 micron; 2.2 V; 220 mA; 3.3 V; 500 kHz; 90.7 percent; CMOS DC-DC boost converter; converter stability; current sensing feedback; feedback loop accuracy; feedback loop gain; high efficiency DC-DC boost converter; medium frequency oscillator; operational amplifier; pulse-width modulation topology; set control signal; switching operation; thick gate oxide; CMOS technology; Circuit topology; DC-DC power converters; Feedback; Inductors; Operational amplifiers; Oscillators; Pulse amplifiers; Pulse modulation; Space vector pulse width modulation;
Conference_Titel :
Circuits and Systems, 2005. 48th Midwest Symposium on
Conference_Location :
Covington, KY
Print_ISBN :
0-7803-9197-7
DOI :
10.1109/MWSCAS.2005.1594437
