TI BQ25798一到四节电池5A降压/升压电池充电器解决方案

TI公司的BQ25798是I2C兼容一节到四节电池5A降压/升压电池充电器,具有双输入选择器,太阳能板MPPT和快速备份模式. BQ25798是全集成的开关模式降压-升压充电器,用于1-4节锂电池和聚合物锂电池.集成包括4个开关MOSFET,输入和充电电流检测电路,电池FET和所有的降压/升压转换器的回路补偿.它采用NVDC功率通路管理,调整系统不会降落到可配置的最低系统电压.当系统功率超过输入源额定指标时,电池补充模式支持系统不会超过输入源指标.采用内置的VOC缩放MPPT算法BQ25798最大化光伏电池板的最大功率.BQ25798在备份模式支持从适配器到转换器电池电压的超快切换.器件具有大功率密度,支持USB PD 3.0,开关频率750-kHz 或1.5-MHz,5A充电电流,10mA分辨率,96.5%效率,支持广泛的输入源,从电池(USB OTG)的供电USB端口,2.8V-22V OTG输出电压,分辨率10mV,支持USB-PD PPS,OTG输出电流调整高达3.32A,分辨率40mA,器件集成了16位ADC用于电压,电流和温度监测,仅工作时静态电流为17 μA,充电关断模式为500nA.2节电池充电电压调整为-0.25%到+0.65%,充电电流调整为±5%,输入电流调整为 ±5%,29引脚4mmx4mm QFN封装.主要用在可视门铃,智能家庭控制,数据集中器,割草机器人,财产跟踪,移动POS,多参数病人监视器,心电仪(ECG)和超声波智能探针.本文介绍了BQ25798主要特性, 功能框图和简化电路图,多种应用框图,以及评估板BQ25792/8EVM主要特性,电路图,材料清单和PCB设计图.

BQ25798 I2C Controlled, 1- to 4-Cell, 5-A Buck-Boost Battery Charger with Dual-Input
Selector, MPPT for Solar Panels and Fast Backup Mode

The BQ25798 is a fully integrated switch-mode buck-boost charger for 1-4 cell Li-ion batteries and Li-polymer batteries. The integration includes 4 switching MOSFETs, input and charging current sensing circuits, the battery FET and all the loop compensation of the buck-boost converter. It uses NVDC power path management, regulating the system not dropping below a configurable minimum system voltage. When system power exceeds the input source rating, battery supplement mode supports the system without overloading the input source. BQ25798 It also maximizes power from photovoltaic panels using its built-in VOC scaling MPPT algorithm. BQ25798 supports ultra-fast switchover fr...