70V bidirectional buck charge controller with power path and automatic backup mode

The BQ25822 is a

wide input voltage, switched-mode buck 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 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.