Automotive, I2C-controlled, 70V, bidirectional buck-boost supercapacitor controller

The BQ25853-Q1

is an automotive grade, wide input voltage, switched-mode buck-boost battery charge

controller with bidirectional power flow support. The device offers high-efficiency

supercapacitor charging over a wide voltage range with accurate charge current and charge

voltage regulation. The device integrates all the loop compensation for the buck-boost

converter, thereby providing a high density design with ease of use. In reverse mode, the

device draws power from the supercapacitor 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, charge voltage regulation, and reverse mode voltage

regulation targets can be set via the ILIMHIZ, ICHG, and FB pins, respectively.