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TIDA-01518: Possible design fault in TIDA-01581? You don't get 11 years lifespan, closer to 0.5 years.

Tor Skjermo
Prodigy 20 points
Part Number: TIDA-01518

Hi!

I have read your TIDA-01518 evaluation board example, and it seems like a very interesting design for our company.
But I believe it might be a design fault issuing the 3x330uF tantalium capasitors:

In the datasheet for the T495C337K004ATE700 it states that the leakage current is 13.8uA, multiply this by 3 and you get 41.4uA of leakage (Tantalium is notoriously thirsty:)

This means you have to add the 41.4uA current to the 1.37uA stand by current and end up with 0.54 year lifespan in contrast to 11.15 years estimate.

Does this make sense?

  • 0
    TI__Intellectual 1535 points

    Hi Tor, thank you for reaching out to us!

    The values listed in the capacitor datasheet are the maximum DC leakage current. The values used in the battery lifetime calculation are based on lab testing and I believe the Tantalum capacitors where removed, as they are only included for higher tolerance in end of life conditions. These can be depopulated or not included to provide the calculated battery life. I hope this helps!

    - Brian Dempsey