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TPS7A4501-SP: ADJ bias current range for WCA

Emmanuel Coleman
Prodigy 20 points
Part Number: TPS7A4501-SP

Tool/software:

I need to perform worst case analysis for the output error, and I used the 15uA max value for Iadj listed in the datasheet table, which pushes my error well outside the allowable limit (>2%).  So far I've lowered the resistor values to reduce the effect of I_adj, but I am curious if the 15uA is valid to use here.  The plot in Figure 13 suggests the bias current is between 1-3uA.  Any idea what the difference is between the figure 13 data and the data in section 7.6?

  • +1
    TI__Genius 12020 points

    Hi Emmanuel,

    15uA would be a conservative max value based on the worst-case extremes of part operation, part-to-part manufacturing variation, and generally some buffer added in to the spec. The typical graph across temp is useful for indicating the overall trend we would expect based on temperature.

    In your case, it may be useful to reference the data from the TID report we provide for this part. Page 15 shows pre/post-TID measurements of this spec at 25C as well as the average and standard distribution so you can get a sense for the statistical variation. This, along with the temp graph should provide you with the information you need to narrow down a more realistic expected range for the spec.

    Let me know if there is anything else I can help with or clarify.

    Thanks,

    Sarah