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TLE2426: Difference between TLE2426 and TLE2426-Q1

Mochi
Genius 3955 points
Part Number: TLE2426

Hello,

Our customer try to substitute of TLE2426 by TLE2426-Q1 as expecting upper compatibility.

When we compared specification of Output voltage regulation at -10mA sourcing condition TLE2426-Q1 is -0.102mV and Non-Q1 has -45uV, it is two times larger.

Both devices have same Output impedance 7.5 mΩ typ, Is there difference of internal feedback gain setting?

 

In my limited experience, generally non-Q1 and Q1 devices have same analog specification other than temperature range.

Are those devices are not same internal circuit design,  not same silicon die?  If so our customer need to apply additional EE product characterization using Q1 device.

Regards,

Mochizuki

  • 0
    TI__Mastermind 22420 points

    Hello Mochizuki,

    When automotive qualifications are done, the device is re-characterized over the full temperature range. The Q1 is assured over the wider temperature range like you mentioned. Some specifications are more conservative such as the output voltage regulation. We can only assure the specifications according to the product data sheet for each device however. 

    Best Regards, 

    Chris Featherstone

  • 0
    Guru 140200 points

    Hi Mochizuki,

    keep in mind that the output voltage regulation of the TLE2426 is not production tested. So, the specs are gained from the characterisation data from the chip design phase only, or by other words, they are gained by simulation and usually a 3 sigma value is given in the datasheet specs for the maximum value.

    This may work with a chip in a standard application. But when you qualify a chip for automotive applications this may no longer work and you need to also take into account all the possible outliers exceeding the 3 sigma limits, just to be on the safe side. And unless you perform a production testing of every single chip, you must give much more conservative specifications.

    There's another issue: The specified "output impedance" characterizes the small signal performance of TLE2426 while the specified "output voltage regulation" characterizes the large signal performance. Because of that, you cannot simply multiply the output impedance by the output current to get the output voltage regulation.

    Kai

  • 0 in reply to kai klaas69
    Genius 3955 points

    Hi Chris and Kai,

    Thank you for your detailed elaboration.

    We well understood the situation why Q1 device has relaxed specification.

    In our case target EE is consumer market and in this moment non-Q1 device sample availability is not good. So, instead of that we try to use Q1 sample for ES evaluation.

    We will move forward to take this action.

     

    Regards,

    Mochizuki