基于減少鋰離子電池能量的額外損耗，本文設計了一款超低功耗鋰離子電池保護電路。
本電路不僅可以對鋰離子電池進行全面有效的保護，而且實現了低功耗。利用MOSFET 的亞閾值導電特性，使電路消耗的電流小于3μA；并且芯片在檢測到過放電時進入到休眠狀態，此時電路消耗的電流僅為0.2μA 左右，大大減少了不必要的能量損耗。
關鍵詞：亞閾值，低功耗，保護電路，鋰離子電池
An Ultra Low Power Li-ion Battery Protection circuit Design
Feng Xu, Hu Jiamin, Han Min, Wang Songlin
（School of Mechano-electronic Engineering,Xi Dian University,xi’an,710071,china）
Abstract：The paper presents an ultra low power Li-ion battery protection circuit based on reducing the extra
energy waste of Li-ion battery. The circuit not only protects Li-ion battery effectively, but also achieves low power.
Taking advantage of the MOSFET’s sub-threshold characteristics, the current consumption of this circuit is lower
than 3μА. Once the over-discharge is detected, the whole circuit is shut down with a standby current of 0.2μА,which greatly reduces unnecessary energy consumption.
Key words: Sub-threshold, Low Power, Protection circuit, Li-ion Battery