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BQ25100A: Short circuit and extreme heating

Part Number: BQ25100A


So I have a little problem, when I connect my BQ25100A to the Charger (Battery disconnected) the whole PCB starts to heats up rapidly. I'm pretty sure I messed something up here.

After disconnecting and connecting the LiPo Battery (Micro-USB Unplugged!)  everything is ok. So I think I messed up somewhere near the BQ25100A, could someone please take a look at my schematic or give me any tips?

Kind Regards,


  • Hello

    The schematic, values and device pin out are OK.

    If the part is heating try to track down where the current is going?

    Is the output possibly oscillating, check with a scope?

    Is problem with only one board, could be assembly issues?

  • Hello Bill,

    thanks for that very quick response!

    - I actually have no clue where the current is going, I check if GND and VCC(IN) are short circuited but it isn't, I'm really confused.

    - I'm in the process of getting a scope so sadly I can't check for the oscillating output. 

    - It's a problem with all the boards

    One question:

    - could it be a possible problem if the Capacitor C20 is located a bit of a distance away? 

  • So it turns out it actually was a short circuit, because I connected the USB GND to VCC and USB VCC to GND...

    Lesson: Always check the library in CAE...