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problem failure BQ24070

David Paoli
Prodigy 20 points
Other Parts Discussed in Thread: BQ24070

Hello,

I have a problem with lion charger BQ24070. About 10% of our products arrive to fhe service with the BQ24070 broken. In particular the IC has the following problem: even if there is the correct input voltage on the IN pin it does not output any voltage on the OUT pin. My suspect is that Q1 is broken. Of course battery is not recharged but I suppose this is a consequence of the previous problem.Attached you find the schematic of our circuit. I am not able to understand what the problem is. Is it possible an ESD problem? I wait your response as soon as possible.

Thanks in advance.

 

Best Regards

 

David Paoli

Aep Srl

Italy

 

 

  • 0
    TI__Mastermind 31120 points

    I do not see anything wrong with the schematic.

    Once in a while we might see an ESD issue on the TS pin since is can be exposed and the part is rated for 2k, but I see you have a capacitor on this pin which will protect it and all other typically exposed connections have capacitors on them so I would rule out ESD.

    The only other application that can kill an IC is reverse connection of the input or Battery.  Typically the ESD diode will shunt up to 1.5A, but if the ESD diode fails then the part will be damaged.  Can your battery or input source be connect in reverse bias?  Most designs, this "keyed" connector will not allow this. 

    If you continue to have the issue you should submit the IC to the TI failure anlaysis group so the failure can be determined.

  • 0 in reply to Charles Mauney
    Prodigy 20 points

    Hi, thanks for your response,

    the polarity of the battery or input source can't be reversed. Another information is that not everytime the OUTPUT voltage is 0V as I told you in my previous mail but sometime is 1,92V.

    I hope this information can give you some indication.

    Best regards

    David