SLUAA84A January   2021  – February 2022 BQ769142 , BQ76942 , BQ76952

 

  1.   Trademarks
  2. 1 Introduction
  3. 2 Circuit Concepts
  4. 3 Configuration
  5. 4 Logic Level FETs
  6. 5 FET Driver Implementation
  7. 6 Transistor Driver Implementation
  8. 7 Controlling LD
  9. 8 Precharge and Predischarge for Low-Side FETs
  10. 9 Summary
  11. 10References
  12. 11Revision History

9 Summary

DDSG and DCHG are available for control when designing with low-side FETs and the BQ769x2 monitor devices. The designer has a variety of options in drivers depending on the need. DDSG and DCHG are logic signals not intended to drive FETS, but in limited cases the desiger may have success with an implementation. IC FET drivers are very capable but the designer may choose a transistor driver implementation with similar success. PDSG and PCHG are included in the DDSG and DCHG timing, if the user wants precharge and predischarge controlled by the BQ76952 some work must be done to separate the FET controls. The examples in this application report will help a designer select an approach for their low-side battery implementation.