Automotive I2C controlled 70-V bidirectional buck-boost charge controller

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 ILIMHIZ, ICHG, and FB pins, respectively.