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TLV1117LV: Output voltage accuracy

Ronnie Hughes
Expert 3080 points
Part Number: TLV1117LV

What is the output voltage accuracy at 1.5V?  Datasheet says +/- 40mV for <1.5V and +/- 2% at 1.5V to less than 2V.  At 1.5V, 2% does not equal 40mV.  This happens at 2V.  Customer is operating at 1.5V.

  • 0
    TI__Guru 55940 points
    We will respond on the next US business day.

    Very Respectfully,
    Ryan
  • 0 in reply to Ryan Eslinger
    TI__Expert 3080 points

    Customer is asking:

    How can we tighten this up from the +/-3.33% @1.2Vout to +/- 2% or better?

    Is this over all line/load conditions or part variation?

     

    For our application we most likely will not exceed 250mA with a 3.3V supply at 1% +2% ripple feeding this 1.2 LDO.

     

    The largest transient is ~180mA, from ~60mA to ~240mA  

     

    Originally we were using LP5907MFX-1.2/NOPB not much margin/growth.

  • 0 in reply to Ronnie Hughes
    TI__Guru 55940 points

    Hi Ronnie,

    For the original question, the 1.5V output has a specified accuracy of ±2%.  This line specifies Vout greater than or equal to 1.5V.  The ±40mV line specifies Vout less than 1.5V.

    The dominant source of inaccuracy is the reference voltage.  As such the accuracy will not improve significantly with a lower load as seen in Figure 6.

    Very Respectfully,

    Ryan