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BQ25170: BQ25170 with reverse polarity battery connected

Kaveh Mohammad
Intellectual 585 points
Part Number: BQ25170

Hi, 

I am using BQ25170DSGR in my design. What will happen if a battery with reverse polarity is connected to this chip out pin? I am not going to use series diode with my battery for reverse polarity protection, because of the voltage drop. So wanted to make sure that if by mistake a reverse polarity battery is connecter to BQ25170DSGR out pin, no hazard is going to happen. 

Is there internal protection inside BQ25170DSGR for battery reverse polarity connection? If not, is there a chance of hazard? Or just BQ25170DSGR will get damaged due to exceeding absolute maximum rating of the chip. 

Please let me know, 

Thanks

  • +1
    TI__Guru* 76046 points

    Hi 

    The BQ25170 does not have reverse battery protection.  This condition could damage the device.

    Problem with a series diode is the voltage drop across diode will throw off the charging profile, voltage of the battery is monitored at OUT with respect to GND.

    Can you use a battery with connector that is keyed?