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BQ25790: How to connect a battery with separate charge and discharge connector

Bivin George
Expert 1057 points
Part Number: BQ25790

I'm planning to use battery shown below. But it has separate charge and discharge connector having different current rating.

But as per application circuit in datasheet, battery shown has only one connector option. Please let me know how the same can be connected within the same application circuitry.

  • 0
    TI__Guru**** 166626 points

    Hi Bivin,

    Your figures did not post correctly, can you repost?

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Expert 1057 points

    Hi Jeff

    Please see image below.

    Also for application circuit , refer 9.2 Typical Application in datasheet of BQ25790.

  • 0 in reply to Bivin George
    TI__Guru**** 166626 points

    Hi Bivin,

    I still don't understand your exact application.  But, I will explain that the NVDC power path architecture of this device means that there is an internal FET connecting BAT to SYS.  The intent is for the system load to discharge the battery into the system load at the SYS pin.  The charger automatically starts powering the system from the BAT pin when input power at VBUS is removed.  If you need a different discharge path, then you will need to use the external FET, with gate driven by SDRV, to disconnect the battery from the BAT pin and connect the secondary load directly to the battery.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Expert 1057 points

    Hi Jeff

    Thanks for the reply. Please refer image attached.

    Please confirm to use a battery with separate charge and discharge connector, i have to connect charge connector (+ve pin) to A (shown in image) and discharge connector (+ve pin) to B.

  • 0 in reply to Bivin George
    TI__Guru**** 166626 points

    Hi Bivin,

    Can you confirm that the discharge and charge lines connect to the charge and discharge FETs of the pack protector?  If so, then I don't think connecting across the SDRV FET will help much.  That FET is on (so the lines are essentially shorted) unless turned off by I2C or from overcurrent out of SYS pin, but the pack protector FET will likely be quicker to turn off. 

    Regards,

    Jeff