SLVAG21 April   2026 TPS61381-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2System Overview
    1.     6
    2. 2.1 Design Considerations
    3. 2.2 System Design Theory
      1. 2.2.1 Supercapacitor Charging Operation
        1. 2.2.1.1 Calculation for Backup Supercapacitor Selection
          1. 2.2.1.1.1 Design Calculations
  6. 3Test Results
    1. 3.1 Standby Operation
    2. 3.2 Charging Operation
    3. 3.3 Boost Operation
  7. 4Summary
  8. 5References

4 Summary

The TPS61381-Q1 can be used as a backup supply by charging the backup battery. This supports various battery types including Li-ion, NiMH, LiFePO4 and supercapacitors, the charging current and the output voltage. During this backup period, the energy stored in the battery is used and regulated at the desired output level, which can be used to issue a dying gasp message, even after the main supply is lost.