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TPS7A21-Q1: Worst case dropout voltage

alan
Prodigy 10 points
Part Number: TPS7A21-Q1

Hi,

In the datasheet for the TPS7A21-Q1, the dropout voltage for different temperatures is specified for Vin=3.6, Vout=3.3V.



However, the electrical characteristics table specifies a worst case dropout of 265 mV.


Just wondering under what conditions does this occur?

  • 0
    TI__Intellectual 2910 points

    Hi Alan,

    I am looking into this, and will respond as I have an answer.

    Regards,

    Bobby

  • 0
    TI__Intellectual 2910 points

    Hi Alan,

    For this device, from the table you shared, you can see as the Vout decreases, dropout voltage increases. Also, from Figure 5-6 (that you shared), you can see as Output Current increases, dropout also increases. In addition to this, from the same plot you can see as junction temperature increases, dropout also increases.

    So a combination of all these factors will give the worst case of dropout.

    Just an additional information, dropout can also change as the packaging changes. For example, take a look at page 12 of the TPS7A20 datasheet to see the difference between different packages.

    Regards,

    Bobby