• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 62 subscribers
  • Views 255 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ25792: BQ25792 damage issue

Star Xu
Genius 9645 points
Part Number: BQ25792


Hi

The customer design with BQ25792, during use, I found that the BAT and SYS pins were short-circuited. After the IC was removed, the short-circuit was no longer there. The inside of the IC should have been broken, and more than 10 boards have been damaged so far.

The software configures the IBUS current limit to 3A, and the charging current into the battery is 1A.

L12 inductor specification as below:

1uH DCR 44m ohm (TYP) 50m ohm (Max) Temperature rise current 4.5A (Max) 5A (TYP) Saturation current 6A (Max) 5.2A (TYP)

The schematic diagram and the PCB are as follow:

Please help check it.

Thanks

Star

  • 0
    TI__Guru**** 169926 points

    Hi Star,

    The schematic looks okay.  The layout does not follow the datasheet and EVM recommended layout but that should not result in damage, only output power limitation.  Most likely, the cause is from 4S battery pack hot plug.  Is there a specific event, like battery attach or remove, that damage occurs?  Is the transient suppressor diode D2 damaged as well?  

    Regards

    Jeff