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.