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BQ2980: Does support reverse charge protection of BQ2980

BlueBottle
Prodigy 80 points
Other Parts Discussed in Thread: BQ2980

Hi,

I'd like know bq2980 how to protect if happen reverse charge condition.

Thanks 

Bluebottle

  • 0
    TI__Guru* 76230 points
    Hi
    The bq2980 by it self does not protect against reverse charger connection. You need to connect a small signal nfet whose gate is is connected to ground and the source and drain accross the gate and source of the charge fet to short them together in the event of a reverse charger connection thereby turning off the charge fet and preventing it from blowing up. see the refernce schematic for a similar device with such a connection
    www.ti.com/.../getliterature.tsp

    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Prodigy 80 points
    Hi Onyx,
    I checked bq27750 user's guide which add resistors on CHG and DSG pin. As you know the PCM layout room is narrow in cell phone battery, Is it really necessary to add resistors? And what's output resistance on DOUT pin when DFET OFF?
    And about Q2 Gate GND connection, can I connect to Battery -, not Pack-?

    Thanks
    Bluebottle
  • 0 in reply to BlueBottle
    TI__Guru* 76230 points
    the bq2980 reference schematic does not have those resistors so they are not needed. Why do you want to connect q2 gate to pack-. if the resistance is not in the data sheet, I wouldn't know it.

    thanks
    Onyx