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BQ24075 and battery protection

MikeW9894
Intellectual 540 points
Other Parts Discussed in Thread: BQ24075

Hi,

Since the BQ24075 has the capability to disconnect the battery, was there a consideration to automatically disconnect the cell if the voltage gets too low while discharging?  Basically, do I need external hardware to monitor and disable the battery/load before the cell kills itself or will the 24075 do that for me?  If it does, what voltage would it disconnect at?

 

Right now, I don't see anything in the datasheet that would suggest it can do this.  V(lowv) can detect low voltages but it appears to only be used in the charger section and not in the battery enable circuitry.  Please let me know if this is right or if I can expect good protection here.

 

Thanks!

  • 0
    TI__Guru**** 150820 points

    No, there is no low battery comparator inside of the charger IC to disable the BAT to OUT FET.  The bq24075 is designed to always provide power to the system if it can.

    Typically, inside battery packs is a pack protector that monitors the voltage and current of the pack.  These typically cutoff at 2.5V.

  • 0 in reply to Chris Glaser
    Intellectual 540 points

    Thank you for the clarification Chris.  The battery's protection is about 2.7V in my cell but that is more of a last resort safety and too low to be running a battery down to all the time.  I will have to come up with a secondary solution for cell protection