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LP2951: Vout of LP2591 has degrade by over time.

ACGUY
Guru 11170 points
Part Number: LP2951

Hello E2E,

Our customer is using the LP2591 for mass production. A few months after shipping, the product was returned by the end customer.
They checked that, the output voltage has been down.

Questions;
1; Does TI have data about degrade by over time for internal reference voltage element of the LP2591?
2; Please let me know about "Reference voltage temperature coefficient". Why is it a positive property for temperature?

Best regards,
ACGUY

  • 0
    TI__Guru 50025 points

    Hi,

    I will look for data regarding degradation of the voltage reference for LP2591 and let you know if I find anything. In the meantime I have some questions about this degradation. 

    1) Were the units tested before shipping and it was then later discovered that the units had a reduced output voltage?

    2) By how much is the voltage reduced and is it constant between units?

    3) Do they have any schematics they can share regarding the issue?

    The "Reference voltage temperature coefficient" is listed as positive because it is the magnitude of the worst-case deviation divided by the temperature range.

    Best regards,

    Nick

  • 0 in reply to Nick Butts
    Guru 11170 points

    Hi Nick,

    Thank you for reply. I request the information about this from our customer.

    Regards,

    ACGUY

  • 0 in reply to ACGUY
    TI__Guru 50025 points

    Hi ACGUY,

    I wasn't able to find any data regarding long term drift for LP2951; we don't normally collect this kind of data. I will be happy to try troubleshooting the issue with the requested information.

    Best regards,

    Nick