New Li-Ion Battery Charger Based on Charge-Pump Techniques

Author

Hwang, Yuh-Shyan ; Wang, Shu-Chen ; Fong-Cheng-Yang ; Chen, Jiann-Jong ; Lee, Wen-Ta

Author_Institution

Dept. of Electron. Eng., Nat. Taipei Univ. of Technol.

Volume

4

fYear

2006

fDate

25-28 June 2006

Firstpage

2259

Lastpage

2262

Abstract

This paper presents a new Li-ion battery charger using charge-pump techniques. It has small chip size and simple structure. Besides, the proposed charger provides basic functions with voltage and current detecting, end-of-charge detecting and automatic charging speed control. The charger is operated in mixed method and supported from trickle/large constant-current mode to constant-voltage mode with different charging rates. This charger is implemented in TSMC 0.35 mum CMOS process with 5 V power supply. Its output voltage is over or equal to 4.2 V and maximum charging current reaches 700 mA. It has 837 mW chip power dissipation and 67.89% power efficiency and chip area is 1.455times1.348 mm² only

Keywords

CMOS integrated circuits; battery chargers; secondary cells; 0.35 micron; 5 V; 67.89 percent; 700 mA; 837 mW; Li-ion battery charger; TSMC 0.35 mum CMOS process; automatic charging speed control; charge-pump technique; chip power dissipation; constant-current mode; constant-voltage mode; current detection; end-of-charge detection; voltage detection; Batteries; CMOS process; Charge pumps; Chemistry; Circuits; Lithium; Paper technology; Switches; Velocity control; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, Circuits and Systems Proceedings, 2006 International Conference on

Conference_Location

Guilin

Print_ISBN

0-7803-9584-0

Electronic_ISBN

0-7803-9585-9

Type

conf

DOI

10.1109/ICCCAS.2006.285128

Filename

4064375