Title :
New Compact CMOS Li-Ion Battery Charger Using Charge-Pump Technique for Portable Applications
Author :
Hwang, Yuh-Shyan ; Wang, Shu-Chen ; Yang, Fong-Cheng ; Chen, Jiann-Jong
Author_Institution :
Dept. of Electron. Eng., Nat. Taipei Univ.
fDate :
4/1/2007 12:00:00 AM
Abstract :
This paper presents a new compact CMOS Li-Ion battery charger for portable applications that uses a charge-pump technique. The proposed charger features a small chip size and a simple circuit structure. Additionally, it provides basic functions with voltage/current detection, end-of-charge detection, and charging speed control. The charger operates in dual-mode and is supported in the trickle/large constant-current mode to constant-voltage mode with different charging rates. This charger is implemented using a TSMC 0.35-mum CMOS process with a 5-V power supply. The output voltage is almost 4.2 V, and the maximum charging current reaches 700 mA. It has 67.89% power efficiency, 837-mW chip power dissipation, and only 1.455times1.348 mm2 in chip area including pads
Keywords :
CMOS integrated circuits; battery chargers; integrated circuit design; mobile communication; voltage multipliers; 0.35 micron; 5 V; 700 mA; 837 mW; CMOS Li-ion battery charger; CMOS process; TSMC; charge-pump technique; charger circuit; charging speed control; circuit structure; constant-current mode; constant-voltage mode; end-of-charge detection; portable applications; voltage/current detection; Algorithm design and analysis; Batteries; Charge pumps; Circuits; Consumer electronics; Electromagnetic interference; Laboratories; Switches; Velocity control; Voltage; Charge pump; Li-Ion battery; charger circuit;
Journal_Title :
Circuits and Systems I: Regular Papers, IEEE Transactions on
DOI :
10.1109/TCSI.2007.890605
