SLUAAP7 January   2024 BQ76905 , BQ76907

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Cell Balancing Circuit Considerations
    1. 2.1 Internal Cell-Balancing Circuit Design
    2. 2.2 External Cell-Balancing Circuit Design Using N-Channel FETs
    3. 2.3 External Cell-Balancing Circuit Design Using BJTs
  6. 3Considerations for a Host-Balancing Algorithm
  7. 4Timing Information
  8. 5Debugging Common Issues With Cell Balancing
    1. 5.1 Using a Resistor Divider as a Cell Simulator
    2. 5.2 Cell Balancing Troubleshooting
  9. 6Summary
  10. 7References

6 Summary

The BQ7690x (which includes the BQ76905 and BQ76907) includes a host-operated cell balancing feature, which allows to extend the battery life of your multi-cell battery pack. Applications needs willl determine the best alternative to incorporate cell balancing in your system design. This document describe how cell balacing works on the BQ7690x, how to increase the balancing current by using external FETs, and systems consideration for the balancing algorithm. In addition, it incorporate tests results using the BQ76907 to showcase the cell balancing functionality, alongiside common issues and troubleshooting techniques for cell balancing. This document is a guide on how to use the BQ7690x cell balancing functionality for your application.