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TPS7H3301-SP: Regulation Accuracy

Art Mecina
Genius 16655 points
Part Number: TPS7H3301-SP

Hello Guys,

Good day.

Our customer have a few questions.

If VLDOIN = 3.3V or 2.5V and VTTREF = 2.0V, what would be the Maximum and Minimum VTT/VO regulation accuracy (or dropout voltage) at 1A and 3A over the operating temperature, -55C to 125C?

Thanks in advance!

Art

  • 0
    TI__Guru 62930 points

    Art,

    This is outside of recommended operating conditions.   VTT/Vo, VTTREF are only rated up to 1.8V.

    VDDQSNS range is from 1V to 3.5V, covering DDR node (VDDQ) voltages of 2.5, 1.8, 1.5, and 1.2V.

    Please advise on the use case, and I will see if I can help.

    Regards,

    Wade

  • 0 in reply to Wade Vonbergen
    TI__Genius 16655 points

    Thanks Wade!

    I'll inform you as soon as the customer get back to me on this.

    Art

  • 0 in reply to Art Mecina
    TI__Genius 16655 points

    Hello Wade,

    As per the customer, what would be the Maximum VTT/VO = 1.2V regulation accuracy (or dropout voltage) at 1A and 3A over the operating temperature, -55C to 125C?

    Thanks!

    Art

  • 0 in reply to Art Mecina
    TI__Guru 62930 points

    Art,

    This is very close to the standard DDR voltage node with VDDQ of 2.5V.

    There is data in the datasheet with VTTSNS set to 1.25V.  With VTTSNS set to 1.25V, the VTT/Vo range is 1.244 to 1.256V.

    It would be very easy to extrapolate the 1.25+/- 0.06V to be 1.2 +/- 0.06V.   This is the no load accuracy to VTTSNS.

    The device is intended to take VDDQ, divide it by 2, and output VTT/Vo and VTTREF.   VTTREF is designed to track VTT/Vo, so the overall accuracy of VTT/Vo is not really specified.  It is not part of the JEDEC specification.  VTT/Vo tolerance to VTTREF is specified at +/-34 mV across load range.  See VTT/Vo(tol) specification in the datasheet.

    Is this for a standard DDR termination use, or is it being used for another function?

    Let me know if customer has additional questions.

    Regards,

    Wade