BQ25856-Q1中文资料汽车类 I2C 控制型 70V 双向降压/升压充电控制器数据手册TI规格书

描述 Description

The BQ25856-Q1 is an automotive grade, wide input voltage, switched-mode buck-boost Li-Ion, Li-polymer, or LiFePO4 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 loop for protection.

Besides the I2C 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

AEC-Q100 qualified for automotive applications

Temperature grade 1: −40ºC ≤ TA≤ 150ºC



Wide input voltage operating range: 4.2V to 70V

Wide battery voltage operating range: up-to 70V with multi-chemistry support:

1- to 14-cell Li-ion charge profile

1- to 16-cell LiFePO4 charge profile

Up-to 70V supercapacitor charging



Synchronous buck-boost charge controller with NFET drivers

Adjustable fSW from 200kHz to 600kHz

Switching frequency dithering for EMI noise reduction (DRSS)

Optional synchronization to external clock

Integrated loop compensation with soft start

Optional gate driver supply input for optimized efficiency



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

Adjustable input voltage (VAC) regulation from 3.3V to 65V with 20mV/step

Adjustable input current regulation (RAC_SNS) from 0.4A to 20A with 50mA/step using 5mΩ resistor



High accuracy

±0.5% charge voltage regulation

±3% charge/input current regulation

±2% input voltage regulation



I2C 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 over- and under-voltage protection

Battery overvoltage and overcurrent protection

Charging safety timer

Thermal shutdown



Status outputs

Input power present status (PG)

Charger operation status (STAT1, STAT2)



Package

36-pin 5mm × 6mm QFN with wettable flanks



Functional Safety-Capable

Documentation available to aid functional safety system design