BQ25756数据手册TI中文资料规格书

描述 Description

BQ25756 是一款具有双向功率流支持的宽输入电压、开关模式降压/升压锂离子、锂聚合物或磷酸铁锂 电池充电控制器。该器件不仅能提供精确的充电电流和充电电压调节，还能提供自动充电预调节、充电终止和充电状态指示，可在宽电压范围内实现电池高效充电。该器件集成了降压/升压转换器的所有环路补偿功能，因此可提供易于使用的高密度解决方案。 在反向模式下，该器件从电池获取电力并通过添加的恒定电流环路调节输入端子电压来实现保护，从而支持 USB-PD EPR 功率配置。

除了 I 2C 主机控制的充电模式，该器件还通过电阻器可编程限制支持独立充电模式。输入电流、充电电流和充电电压调节目标可分别通过 ILIM_HIZ、ICHG 和 FB 引脚进行设置。

特性 Features

• Wide input voltage operating range: 4.2 V to 70 V
• Wide battery voltage operating range: up-to 70 V with multi-chemistry support:
• 1- to 14-cell Li-ion charge profile
• 1- to 16-cell LiFePO 4 charge profile

• Synchronous buck-boost charge controller with NFET drivers
• Adjustable switching frequency from 200 kHz to 600 kHz
• Optional synchronization to external clock
• Integrated loop compensation with soft start
• Optional gate driver supply input for optimized efficiency

• Automatic maximum power point tracking (MPPT) for solar charging
• Buck-only mode
• Bidirectional converter operation (Reverse Mode) supporting USB-PD Extended Power Range (EPR)
• Adjustable input voltage (VAC) regulation from 3.3 V to 65 V with 20-mV/step
• Adjustable input current regulation (R AC_SNS) from 400 mA to 20 A with 50-mA/step using 5-mΩ resistor

• High accuracy
• ±0.5% charge voltage regulation
• ±3% charge current regulation
• ±3% input current regulation

• I 2C controlled for optimal system performance with resistor-programmable option
• Hardware adjustable input and output current limits

• Integrated 16-bit ADC for voltage, current, and temperature monitoring
• High safety integration
• Adjustable input overvoltage and undervoltage protection
• Battery overvoltage and overcurrent protection
• Charging safety timer
• Battery short protection
• Thermal shutdown

• Status outputs
• Adapter present status ( PG)
• Charger operation status (STAT1, STAT2)

• Package
• 36-pin 5 mm × 6 mm QFN