A 0.99 µA Operating Current Li-Ion Battery Protection IC

Yen-Shyung SHYU  Jiin-Chuan WU  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E85-C   No.5   pp.1211-1215
Publication Date: 2002/05/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Optoelectronics
Keyword: 
Li-ion battery,  protection IC,  low power,  bandgap voltage,  

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Summary: 
A lithium-ion (Li-ion) battery protection IC with an average current of 0.99 µA (at a battery voltage of 3.6 V) and a standby current (after detecting over-discharge) less than 0.01 µA is presented. This low power performance is achieved via a power-on duty-cycle technique. The protection circuit samples the voltage of the battery periodically and powers down during the rest of time. This Li-ion battery protector provides over-charge, over-discharge, excess-current and short circuits protection. This protection IC was implemented in a 0.6-µm CMOS technology and the active area is 880 µm 780 µm.