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TPS62840: Violating VIN recommended in rare cases

Sepeedah Zadeh
Intellectual 2850 points
Part Number: TPS62840

Hello team, 

Customer is using TPS62840 in a design with two lithium coin cells in series (CR2450X). Although the nominal voltage is 3V, battery vendor is saying that the absolute maximum voltage (OCV at 85C) is 3.4V, so 6.8V total. This would be between recommended VIN and Abs max VIN for TPS62840. Given this 6.8V condition will be fairly rare, and confined to the beginning of this device's life cycle, should we have a concern here? Do you have information on exactly how much of a reliability impact that could have? 

Thanks!

  • 0
    TI__Mastermind 19150 points

    Hi Zadeh,

    The Recommended Vin range for TPS62840 is 1.8V to 6.5V but we have some threshold on the Abs max ratings. It is always advisable to follow datasheet recommendations. But in this case as you mentioned this is fairly rare, I think it should not be a problem as long as it does not exceed 7V max. But it is good to confirm the application requirements and reliability constraints as well.

    I hope I answered your question! Please let me know if I can help further!

    Regards,

    Febin

  • 0 in reply to Febin
    TI__Intellectual 2850 points

    Thanks Febin. How can we confirm the reliability constraints? Is there any data that shows how long we can run at 6.8V without any issue?

  • 0 in reply to Sepeedah Zadeh
    TI__Mastermind 19150 points

    Hi Zadeh,

    The Absolute Maximum Rating for Vin is –0.3V to 7V. As you mentioned, Vin reaches 6.8V sometimes, this will not typically damage the device. Unfortunately we cannot specify any value for how long it can run as this is not part of our device characterization. But this should be in the range of a few nano seconds. We always advise to operate the device in our recommended conditions.

    I hope this helps! Please let me know if I can help further!

    Regards,

    Febin