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Accuracy of LP2980AIM5-3.3 over temperature

M. Hemmerle
Prodigy 100 points

We want to use one LP2980AIM5-3.3 as supply for an analog circuit (IL = 21 mA). The used temperature range is from 10 °C to 60 °C and we need an accuracy of at least 0.9%. In the datasheet (6.5 Electrical Characteristics) I can only find Information over the whole temperature range.

What is the accuracy of the device in the needed temperature range? Is there any detailed information?

Thank you!

  • 0
    TI__Mastermind 24975 points
    Hello M,

    Is Figure 2 in the datasheet what you are looking for?
    www.ti.com/.../lp2980-n.pdf

    You may also want to take a look at the LP2985-33, as it could be a lower cost device.
    www.ti.com/.../lp2985-33
    Figure 2 in this datasheet also describes device performance vs. temperature.

    Best,
    Michael
  • 0 in reply to Michael J Schultis
    Prodigy 100 points
    Hello Michael,

    Thank you for your answer. Figure 2 contains the Information I was looking for.

    There is only one question left. In 6.5 there is a given output voltage tolerance of +/- 2.5 % but in Figure 2 the tolerance is much lower. Is this because in Figure 2 there is no load applied? Or is there any other reason?

    Best regards,
    Marco
  • 0 in reply to M. Hemmerle
    TI__Mastermind 24975 points
    Hello Marco,

    I am sure that there is some load for Figure 2. It may be a light load, but I am not exactly sure what it is.
    The main reason that you are seeing the discrepancy is in how we spec our parts. The curve for Figure 2 is a single curve taken from what we consider a typical device.
    Since anything we put in the electrical characteristics, we must guarantee, we have to have guard banding to ensure that all devices fit within the specification.
    Most of the devices will fit well within the specification, however, there may be the occasional device (due to process variation) that will approach the MAX or MIN limits that we specify in the datasheet, so that is why we put it in the electrical characteristics table this way.

    Let me know if this doesn't make sense, and I will be happy to clarify.

    Best,
    Michael