BQ62809

The BQ62809 is a 9-channel current converter that enables charge redistribution for Active Cell Balancing (ACB) within a battery pack/module. The balancing current and cell input range support a wide array of battery chemistries and the control topology supports flexible configuration of charge redistribution over an industry standard stackable communication bus. Integrated protection features support fault detection at multiple levels to protect the battery cell, device channel, and digital communication bus.

Each BQ62809 can support up to 9 series battery cells and can connect in series to support configurations up to 36 series cells. The architecture supports multiple charge re-distribution schemes that allows energy to transfer between multiple cells simultaneously. Charge can be transferred between stacked BQ62809 devices and support for concurrent, independent, and simultaneous charge transfer between multiple groups of cells. Independent device and channel reporting allow for reporting of integrated current monitors as well as device status bits.

The device offers a low component count requiring one inductor and two bulk capacitors per channel. The topology allows for standard off-the-shelf components allowing for a dense layout.

Integrated fault protection features include overvoltage, undervoltage, openwire, shortcircuit, overcurrent, thermal regulation and thermal protection of both the battery cells and device channels. When a fault condition is reported, the device has a dedicated pin for FAULT reporting between stacked devices to enable a prompt shutdown of any active balancing conditions.

The BQ62809VDXR is available in a 36-pin 4.50mm × 6.00mm WQFN package