BQ25756E数据手册TI中文资料规格书

描述 Description

The BQ25756E is a wide input voltage, switched-mode buck-boost Li-Ion, Li-polymer, or LiFePO 4 battery charge controller with bidirectional power flow support. The device offers high-efficiency battery charging over a wide voltage range with accurate charge current and charge voltage regulation, in addition to automatic charge preconditioning, termination, and charge status indication. The device integrates all the loop compensation for the buck-boost converter, thereby providing a high density solution with ease of use. In reverse mode, the device draws power from the battery and regulates the input terminal voltage with an added constant current limit for protection, supporting USB-PD EPR power profile.

Besides the I 2C host-controlled charging mode, the device also supports standalone charging mode via resistor programmable limits. Input current, charge current and charge voltage regulation targets can be set via the ILIM_HIZ, ICHG and FB pins, respectively.

特性 Features

Wide input voltage operating range: 4.2 V to 36 V

Wide battery voltage operating range: up-to 36 V with multi-chemistry support:

1- to 7-cell Li-ion charge profile

1- to 9-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

Bidirectional converter operation (Reverse Mode) supporting USB-PD Extended Power Range (EPR)

Adjustable input voltage (VAC) regulation from 3.3 V to 36 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