TI bq25790 5A四电池开关模式降压－升压电池充电解决方案

TI公司的bq25790是5A一个到四个电池开关模式全集成降压-升压电池充电器,用于锂电池和锂聚合电池, 包括有4个开关的MOSFET(Q1,Q2,Q3和Q4),输入和充电电流检测电路,电池FET(QBAT)和降压-升压转换器所有的回路补偿.器件对充电电池在USB Type-C™和USB供电(USB-PD)应用如智能手机,平板电脑和其它手持设备的全输入电压范围内提供高功率密度和设计灵活性.该器件采用750kHz和1.5MHz可编程开关频率,具有优化的效率:3A ICHG时,2个电池的效率为96.5%(9V输入),15V输入时效率为94.5%.充电电流高达5A,分辨率为10mA,工作电压3.6V到24V, 绝对最大额定值为30V,检查USB BC1.2, SDP, CDP, DCP, HVDCP和非标准适配器,可检查USB BC1.2, SDP, CDP, DCP, HVDCP和非标准适配器. 2个电池时的充电电压调整率为±0.5%高精度,充电电流调整度为±5%,输入电流调整度为±5%,器件具有热调节和热关断特性,输入/电池OVP和OCP,转换器MOSFET OCP以及充电安全计时器.56引脚2.9x3.3mm WCSP封装. 主要用在智能手机,平板电脑和无人机,无线扬声器和数码相机,移动打印机,电子销售终端(EPOS).本文介绍了BQ25790主要特性,功能框图,多种应用框图,以及评估模块BQ25790EVM (BMS027)主要特性,电路图,材料清单和PCB设计图.

The BQ25790 is a fully integrated switch-mode buckboost charger for 1-4 cell Li-ion battery and Lipolymer battery. The integration includes 4 switching MOSFETs (Q1, Q2, Q3, Q4), input and charging current sensing circuits, the battery FET (QBAT) and all the loop compensation of the buck-boost converter. It provides high power density and design

flexibility to charge batteries across the full input voltage range for USB Type-C™ and USB power delivery (USB-PD) applications such as smart phone, tablet and other portable devices.

The charger supports the narrow VDC power path management, in which the system is regulated at a voltage slightly higher than the battery voltage, but not drop below the minimum system voltage. The system keeps operating even when the battery is completely discharged or removed. When load power exceeds input source rating, the battery gets into supplement mode and prevents th...