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Switch to disconnect a rechargeable coin lithium battery

Elder Costa17
Expert 2825 points
Other Parts Discussed in Thread: TPS22916

I have an RTC powered by a Panasonic ML-621 cell. I followed their application directions () but I would like to add extra protection to avoid deep discharge if possible. Do you have some suggestion? I am thinking of something similar to the GLF73510 switch.

Thanks in advance.

  • 0
    TI__Genius 15780 points

    Hi Elder Costa17,

    The closest device we have to the GLF73510 is the TPS22916. Both have very similar leakage current, but the TPS22916 is in a smaller 0.4mm pitch CSP package. Do you think a device like this would work?

    Thanks,

    Alek Kaknevicius

  • 0 in reply to Aleksandras_Kaknevicius
    Expert 2825 points
    Hello, Alek.

    Thank you for your prompt response.

    I would like to have it disconnecting the battery when it reaches around 2V of output voltage. I do not see a simple way to do it with TPS22916 (may be I am missing something here).

    Thank you.

    Elder
  • 0 in reply to Elder Costa17
    TI__Genius 15780 points

    Hi Elder,

    Are you referring to an undervoltage lockout feature (UVLO)? The TPS22916 does not have this, but the closest solution we have is to connect a resistor divider from the VIN pin to the ON pin so that the device turns off when VIN is around 2V. However, there is some variance for the ON pin, so it may not be an exact 2V. Is this the kind of functionality you are looking for?

    Thanks,

    Alek Kaknevicius

  • 0 in reply to Aleksandras_Kaknevicius
    Expert 2825 points
    Hello, Alek.

    Yes for the last sentence.

    If I understood the data sheet properly, ON pin voltage threshold is not well defined. Also ON input leakage current is relatively high (20nA from the top of my head) so it would require a relatively low voltage divider to have some accuracy.

    Thanks,

    Elder.