Maxim MAX17320 2S－4S电池组电量计量解决方案

Maxim公司的MAX17320是38μA IQ单独可用的电池侧电量计量集成电路,具有保护器,电池内部自放电检测和选择SHA-256认证,用于2到4串接锂电池/聚合物电池.器件检测电压,电流,温度和电池状态, 采用外接高边N-FET以提供对过压/欠压,过流,短路,超温/低温,过充和内部自放电条件的保护,并提供充电预描述以保证电池工作在安全条件,从而延长了电池寿命. MAX17320采用内部的FET来平衡电池.在预先通过鉴定的充电,器件采用CHGFET进行线性控制充电.电量计量采用该公司的ModelGaugeTM m5算法,组合了短期精度和库仑计线性度,以及基于电压的电量计量长期稳定性,从而提供业界一流的电量计量精度. MAX17320能自动补偿电池老化,温度,放电速率,在各种工作状态下能以毫安时(mAh)或百分比(%)提供精确的电荷状态(SOC).器件提供可配置的常开的LDO,能给系统侧的小型临界负载供电,即使在故障情况下也不会对电池造成过载.动态功率功能提供瞬态最大电池输出功率. MAX17320提供1-Wire®或2-wire I2C/SMBus接口,对数据和控制寄存器进行存取.器件采用无铅2.4mm x 2.6mm 30凸0.4mm 间隔WLP封装和4mm x 4mm 24引脚TQFN封装.主要用在智能手机,平板电脑和2合1膝上型计算机,医疗设备,健康和健美监视器,数码相机,录相机和动作摄像机,手持计算机,无线电和终端,电动工具,无线扬声器和无人机,智能电池和备份电池.本文介绍了MAX17320主要优势和特性,框图和典型应用电路图,评估板MAX17320X/MAX17320G EVK主要特性,电路图,材料清单和PCB设计图.

 The MAX17320 is a 38μA IQ stand-alone pack-side fuel gauge IC with protector, battery internal self-discharge de­tection, and optional SHA-256 authentication for 2 to 4 se­ries lithium-ion/polymer batteries.

The IC monitors the voltage, current, temperature and state of the battery to provide protection against over/un­dervoltage, overcurrent, short-circuit, over/undertempera­ture, overcharge, and internal self-discharge conditions using external high-side N-FETs, and provides charging prescription to ensure that the battery operates under safe conditions, thereby prolonging the life of the battery. The IC balances the cells using internal FETs. During prequal charging, the IC uses the CHGFET to linearly control charging.