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TPS7B84-Q1: Regulated output accuracy

KEIJI YAMAMOTO
Prodigy 70 points
Part Number: TPS7B84-Q1

Tool/software:

Hi team,

I have a question regarding the Regulated output accuracy listed in the datasheet.

1.The voltage accuracy is specified for two types, Tj=25℃ and Tj=-40℃ to 150℃.
   Is the temperature characteristic ±0.25%?
  Or does this mean that ±0.75% is added to the ±0.5%?

2.It seems that the temperature characteristics differ depending on the package. Can you tell me why?

Best regards.

  • +1
    TI__Expert 5060 points

    Hi,

    1) The tighter accuracy spec (+0.5%) overrides the looser one (+0.75%) at TJ=25'C. We guarantee the +0.75% figure everywhere within the entire -40'C<=TJ<=150'C range but are able to quote a stricter +0.5% range at room temperature. Numbers specific to general package ("Regulated output accuracy"), replace with +0.75% and +1% respectively to apply to "Regulated output accuracy DCY".

    2) While thermal performance of devices normally does have a level of package dependence (we publish a package specific thermal metrics table as well), it appears that the wider tolerance here was given to allow more flexibility in manufacturing with the given package. Min and max values are guaranteed, values in analog chips are slightly dependent on everything, and occasionally we have to adjust our spec because real world behavior in a specific scenario is uncomfortably close to the limit if we don't.  

    Best,

    Gregory Thompson