SLUAB05 April   2025 BQ25856-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2ACUV and ACOV Settings
  6. 3Derivation
  7. 4Application Diagram
  8. 5Application Example - Electrolytic Capacitor Backup
  9. 6Application Example - Super Capacitor Backup
  10. 7Summary
  11. 8References

Abstract

A capacitor backup or last gasp circuit provides a short boost of backup power for when the main power fails. A capacitor backup is a common requirement across a wide variety of applications. This is a critical need to make sure MCUs can shut down safely, volatile memory can be stored, safety doors can open, or to provide a small boost of power during a blip in the main power. The BQ25856-Q1 can charge both super capacitors and normal capacitors to work in this application.