A small ripple regulated charge pump with automatic pumping control schemes

Author

Kim, Sung-Eun ; Song, Seong-Jun ; Kim, Jin Kyung ; Kim, Sunyoung ; Lee, Jae-Youl ; Hoi-Jun Yoo

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea

fYear

2004

fDate

21-23 Sept. 2004

Firstpage

383

Lastpage

386

Abstract

Two schemes for a charge pump are presented, to reduce output ripple voltage, with high load current drivability. The first is an automatic pumping current control scheme which automatically adjusts the size of the pumping driver to reduce the ripple voltage. The second is an automatic pumping frequency control scheme, which changes the pumping period by controlling a VCO. The prototype chip provides 30-mA load current and delivers a regulated 4.5-V output with a flying capacitor of 330-nF and a clock frequency which automatically varies from 400-kHz to 600-kHz at a 3.3-V supply. The area is 0.25 mm² in a 3.3-V 0.13-μm CMOS technology, and measured output ripple voltage is less than 33.8-mV with 2-μF load capacitor. Power efficiency is higher than 70%.

Keywords

CMOS integrated circuits; DC-DC power convertors; driver circuits; switching convertors; voltage regulators; voltage-controlled oscillators; 0.13 micron; 2 muF; 3.3 V; 30 mA; 33.8 mV; 330 nF; 4.5 V; 400 to 600 kHz; 70 percent; CMOS; VCO; automatic charge pumping control; flying capacitor; high load current drive; low ripple regulated charge pump; output ripple voltage reduction; power efficiency; pumping current control; pumping driver; pumping frequency control; Automatic control; CMOS technology; Capacitors; Charge pumps; Clocks; Current control; Frequency control; Prototypes; Voltage; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference, 2004. ESSCIRC 2004. Proceeding of the 30th European

Print_ISBN

0-7803-8480-6

Type

conf

DOI

10.1109/ESSCIR.2004.1356698

Filename

1356698