SLUSCU0I March 2018 – September 2020 BQ77915
The device achieves pack protection via the integrated independent CHG and DSG low-side NMOS FET drivers, which may be disabled through two control pins. These control pins may also be used to achieve cell protection solutions for higher series (6 series and beyond) in a simple and economical manner. To do this, simply cascade a higher device CHG and DSG outputs to the immediate lower device control pins. For added flexibility, discharge overcurrent protection delays can be programmed using a resistor connected from the OCDP pin to VSS.
The BQ77915 protector achieves a smart passive cell-balancing algorithm via integrated FETs for cell balancing currents up to 50 mA. For higher cell-balancing current requirements, external FETs can be connected. A HIBERNATE mode intended for shipping and storage of the battery packs enables ultra-low power operation.
The BQ77915 protector is intended for battery packs where no host monitoring is required.