SLUAAZ6 October   2024 BQ25638

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2What is Dynamic Power Management?
  6. 3How to Achieve Solar Battery Charging with VINDPM
  7. 4Using the BQ25638 and BQ2562x for Solar Battery Charging
  8. 5Other Key Takeaways
  9. 6Summary
  10. 7References

6 Summary

When trying to pull maximum current with a battery charger from a solar panel, the solar panel tends to brown out the input voltage. To prevent this phenomenon, the battery charger needs to hold the input voltage at a fixed value. Preferably, the user needs to hold the input voltage at the MPP. BQ25638 and BQ2562x present designs with programmable VINDPM in 40mV steps to hone in on the MPP. Furthermore, the devices have an ADC that can be used to monitor the charge current. This can be used to periodically sweep the VINDPM settings looking for the MPP as conditions for the solar panel change.