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LP5907: drift and long term stability numbers

Sven Jansen
Prodigy 220 points
Part Number: LP5907

Hello,

I want to use LP5907 (2.5V and DSBGA package) in a new design.
For some calculations and budgetting, I need some numbers for temperature drift and long term stability.

Could someone provide me these numbers?

Thank you,

Sven

  • 0
    TI__Guru 55940 points
    Hi Sven,

    Linear regulators are not commonly tested and specified for temperature drift over time. This type of testing is typically an indicator of a voltage reference requirement rather than a linear regulator. The output voltage tolerance as specified in the Electrical Characteristics table of the datasheet and the typical characteristics curves showing output voltage vs temperature are the only data available of how the output voltage can vary with regards to temperature.

    For more information about voltage references, please refer to the following:
    www.ti.com/.../overview.html

    Very Respectfully,
    Ryan
  • 0 in reply to Ryan Eslinger
    Prodigy 220 points

    Hello Ryan,

    Thank you for your response! Because our system had some hard requirements regarding reference voltage (package size, noise, Iq), we had to go for an LDO option (REF3325-KGD was also investigated but is not preferred by project because of wirbonding, high prize and MOQ). This LDO however is not a problem because our system is fully ratiometric (slow system, temperature measurement) so that we need no high initial accuracy or low drift.

    The reason that I'm interested in these numbers is that I've to map a certain temperature range to the reference level. I already took into account the 2% tolerance. But do I have to take an extra margin for drift/long term stability?


    Lets say I still use this LDO after 7 years, is it still guaranteed that the output voltage (in temperature range 20-24 degrees) will be within this 2% tolerance?

    Best regards,

    Sven

  • 0 in reply to Sven Jansen
    TI__Guru 55940 points
    Hi Sven,

    Before releasing a new product, we perform acceleration testing per the JEDEC based qualification tests (specifically JESD47):

    www.ti.com/.../reliability-testing.html

    As part of this test, we run the devices through our test program before and after the acceleration tests in order to ensure that the device passes the program throughout its lifetime. As such, over the lifetime of the LDO, LP5907 should be within the 2% output tolerance over the stated test conditions.

    The result of our qualification testings can be fount here:

    www.ti.com/.../estimator.tsp

    Very Respectfully,
    Ryan