SLUSCM3K June 2016 – July 2020 BQ77904 , BQ77905
PRODUCTION DATA
The BQ77904 and BQ77905 families are full-feature stackable primary protectors for Li-ion/Li-Polymer batteries. The devices implement a suite of protections, including:
The BQ77904 supports 3-series-to–4-series cell configuration and BQ77905 supports 3-series-to–5-series cell configuration. Up to four devices can be stacked to support ≥6-series cell configurations, providing protections up to 20-series cell configurations.
The device has built-in CHG and DSG drivers for low-side N-channel FET protection, which automatically open up the CHG and/or DSG FETs after protection delay time when a fault is detected. A set of CHG/DSG overrides is provided to allow disabling of CHG and/or DSG driver externally. Although the host system can use this function to disable the FETs' control, the main use of these pins is to channel down the FET control signal from the upper device to the lower device in a cascading configuration in ≥6-series battery packs.