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BQ29200 Cell Balancer with a 2-cell charging circuit

Kim1115
Prodigy 110 points
Other Parts Discussed in Thread: BQ29200

I am looking at the BQ29200 dual cell balancing device from TI.  Do you have any white papers, design guidelines, application note, or amy other collateral which show an example charging circuit?  I checked device spot on your website but I did not see any thing beyond the datasheet listed.

  • 0
    Prodigy 130 points

    Looking at the same part - just bumping this to see if there's any more in the last year.  

     

    I would like to use the cell-balancing feature only and leave the overvoltage protection part unused, as I intend to use it in conjunction with a separate overvoltage and overdischarge IC and 2 LiPo batteries.

     

    Thanks for any info -

     

    Geoff Gross

     

  • 0 in reply to Geoffrey Gross
    TI__Genius 10235 points

    There is no way to disable the overvoltage protection in this device. The primary function is as an overvoltage protector.

  • 0 in reply to Chase7071949597
    Prodigy 130 points

    Oh, I was just thinking to leave the overvoltage bit disconnected entirely - something like this perhaps?

     

    Although it wouldn't hurt to have both overvoltage protection chips there I suppose.   I can't eliminate the second one however, as I need some form of over-discharge protection, which the bq29200 doesn't have.

     

    If there is a dedicated 2-cell battery balance IC, that would actually be preferable, but I haven't been able to find one.  

     

    Thanks!

     

  • 0 in reply to Geoffrey Gross
    TI__Genius 10235 points

    It looks like there is a way to do it, but you will still need to connect VC1 and VC2. The chip needs those pins connected to determine which cell to balance. To disable the OV protection you will need to tie the CD pin to GND through a 10K resistor.