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LM1117: Temperature Stability, Temperature Stability,Long Term Stability

Renan Santos Adriano
Genius 16510 points
Part Number: LM1117

Hi Team,

Good day.

My customer is working with LM1117IDT-5.0 and wanted to clarification on the worst-case VOut performance with respect to temperature. Checking with section 7.6, page 8. of datasheet Vout is specified as 4.8 to 5.2 V over a -40C to +125C range.  On-Page 9, Temperature Stability is specified as 0.5% and Long Term Stability as 0.3%.  On page 10, Figure 6 Typical Temperature Stability is shown to be perhaps +/- 0.25% from -50C to +150C.  

Can you share with us what is the correct interpretation of the Temperature Stability is specified as 0.5% and Long Term Stability as 0.3%? is that error? Is this exclusive or inclusive of the 4.8 to 5.2 V range specified under VOut?

Thanks in advance.

Renan

  • 0
    TI__Mastermind 23361 points

    Hi Renan, 

    As shown in Figure 6, the temperature stability shows how the output will change across temperatures when other conditions are controlled. The long term stability is the output change over time with all other parameters controlled. 

    The accuracy of the LDO is primarily determined by the accuracy of the internal reference, the difference between the output options is indeed a different gain of the reference. The datasheet does not specify which output option of the percentage error applies to. To be conservative, I would use the stability drift number on the reference voltage, which is 1.25V, and if you have a higher output option, I would consider multiplying the gain and recalculate the stability percentage number. 

    Does it make sense? 

    Regards, 
    Jason Song