SDAA050 August   2025 BQ25180 , BQ25186 , BQ25188 , BQ25622E , BQ25638 , BQ25798 , BQ25890 , TPS2121

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Possible Architectures
    1. 2.1 Power Mux
      1. 2.1.1 Other Power Mux Considerations
      2. 2.1.2 Power Mux Over Voltage and Priority Settings
      3. 2.1.3 Power Mux Testing
    2. 2.2 Multicell Charger IC
    3. 2.3 Dual Chargers
    4. 2.4 eFuses (USB OTG)
  6. 3Summary
  7. 4References

2.2 Multicell Charger IC

Another method of using dual sources in a battery charging application is the use of one of TIs multicell battery charger ICs with dual input selector (BQ25798, BQ25672, BQ25692). Note that the BQ25692 has a much higher minimum input voltage of 6V compared to the 3.6V-3.9V for the other products presented making the devices not preferred for many single cell applications.

The implementation of the dual input feature is well documented in the data sheets of the respective devices and recommendations for the external FETs required for this feature can be found in the EVM user guides for the ICs.

Section of the Application Diagram Figure 2-9 Section of the Application Diagram