基于减少锂离子电池能量的额外损耗，本文设计了一款超低功耗锂离子电池保护电路。本电路不仅可以对锂离子电池进行全面有效的保护，而且实现了低功耗。利用MOSFET 的亚阈值导电特性，使电路消耗的电流小于3μA；并且芯片在检测到过放电时进入到休眠状态，此时电路消耗的电流仅为0.2μA 左右，大大减少了不必要的能量损耗。关键词：亚阈值，低功耗，保护电路，锂离子电池An Ultra Low Power Li-ion Battery Protection circuit DesignFeng 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 extraenergy 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 lowerthan 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