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BQ25713: 5mohm Rsense between SRP an SRN

Antony Lin
Genius 13480 points
Part Number: BQ25713

Hi,

The application we have now for using BQ25713 is as below.

  • Max Charge current: 8796mA
  • Max discharge current: 8000mA

Based on BQ25713 spec I think we need to use a lower Rsense value between SRP and SRN, so the plan is to use a 5mohm resistor here.

So, our questions are,

  • From HW design, what else would be changed to fir 5mohm Rsense?
  • From SW register, which register should be configured or decoded in a different way to match 5mohm design?

THanks!

Antony

  • 0
    TI__Mastermind 33385 points

    BQ25713 only supports 10mohm and 20mohm according to the datasheet, however, you may trick the controller with 5mohm RSR. That means you set all the charging and discharging threshold by 1/2. The battery charge controller reads the voltage across RSR to determine the current level.