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TPS4800-Q1: Tolerance clarification

Matthias Zimmermann
Prodigy 20 points
Part Number: TPS4800-Q1

Tool/software:

Hi,

I have some trouble understanding the tolerance of the OV pin of TPS4800-Q1 (voltage rising threshold).
Could you please clarify?

In the datasheet (12/2024 version), there are two different values given.
on page 6: Overvoltage threshold input, rising: 1.171V (min) 1.225V (typ) 1.278V (max)
-> which is -4.41% / +4.33%
on page 19 (chapter 7.3.4): "an accurate overvoltage protection (< ±2%)"
Obviously, this is a big difference and in our application we require a tight tolerance.

Does this difference relate to the operating conditions (temperature)?
i.e. -4.41% / +4.33% from -40°C to +125°C and ±2% at 25°C ?

If so, could you please provide more data to the min/max values for a reduced temperature range (0°C - 85°C) ?

Kind regards,
Matthias Zimmermann

  • 0
    TI__Expert 8220 points

    HI Matthias, 

    I see your point. Let me check on this and get back to you tomorrow. 

    Thanks,

    Sarah

  • +1 in reply to Sarah Raines
    TI__Expert 8220 points

    HI Matthias, 

    I did confirm the datasheet +/- 2% is an error. The values in the Electrical Characteristics table are the true accuracy for OV and UVLO. 

    The way you have calculated above is the correct way to determine accuracy as ~ +/-5%.

    If this number is too high can you consider TPS1211/ TPS4811? This does have OV accuracy < +/-2%.

    Thank you, 

    Sarah

  • 0 in reply to Sarah Raines
    Prodigy 20 points

    Hi Sarah,

    thanks for your response.

    TPS1211/TPS4811 are not suitable, as we require -60V reverse input voltage protection.

    We are already in a late stage of development and were surprised by the big change in tolerance from the preliminary datasheet to the now final datasheet.
    We will have to adjust our spec, which is possible.

    Regards
    Matthias