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BQ24296: How to discharge the battery through this IC with 3.9V &5.5 A

Shubham patil
Intellectual 520 points
Part Number: BQ24296
Other Parts Discussed in Thread: BQ25896, BQ24196, BQ25601

Hi ,

In our board we are using BQ24296 in our application we required 5.4 A current when battery is present .when USB is not present only battery then we required 3.7 to 4.2 voltage and current is 5.4A but we are not able to generated this current our battery charger IC is off after connecting 5.4A load to output side so we need your help for this the schematic is below so use this  sch_501-1-00787_a0_41.pdf 

  • 0
    Intellectual 520 points
    from battery discharge we required 5.4 A current from battery and our battery is 10000Mh so battery will provide this amount of current but our battery charger IC will off or limit this amount of large current but when both (USB & battery) power source is present then this current ok and board also working
  • 0 in reply to Shubham patil
    TI__Expert 8230 points
    Hello Shubham,

    The over-current protection for the BATFET on the bq24296 is minimum 5.5A and typical 6.6A. When you begin discharging your battery, the inrush current plus discharge current is most likely making the OCP trip, turning off the BATFET. This would also explain why when the adapter is plugged in, the BATFET is turned on again (recovers from OCP) and you get current into the system.

    If your application requires this discharge current, I recommend moving to a different part such as the bq24196 or bq25896.
  • 0 in reply to Fernando Lopez
    Intellectual 520 points
    Thanks for your valuable input can you give the part same or pin compatible with BQ24296 then we can replace this part in same board
  • 0 in reply to Shubham patil
    TI__Expert 8230 points
    Hello Shubham,

    The closest pin-to-pin replacement part would be the bq25601, but the OCP threshold on this device is also ~6A which wouldn't work for your application.

    The bq24196 has a higher OCP threshold, but it has 2 TS pins vs 1 TS+QON pin on the 296 (pins 11 and 12).

    The bq25896 also has a higher OCP threshold, but pin 24 is a No Connect where pin 24 is VBUS on the 296.

    If you want to use the bq25896, you would need to disconnect pin 24 from VBUS. If using bq24196, you would need to remove the QON switch (or connecting to the MCU) and tie it to pin 11.
  • 0 in reply to Fernando Lopez
    Intellectual 520 points

    Hi

    The QON is unconnected in our schematics so we will tie both the Pins. then BQ24196 is easily  replace in board and it will work right ????? 

  • 0 in reply to Shubham patil
    TI__Expert 8230 points
    Hello Shubham,

    Yes, that should work fine if you connect TS1/TS2 together.