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Output Impedance characteristics

Hirotsugu Kobayashi
Mastermind 9530 points

Hi, team.

A output impedance vs frequency is indicated on several LDO, but how should this parameter be used?

Is it related in stability or noise performance?

Best Regards,

  • 0
    Guru 140200 points
    Hi Hirotsugu,

    an example: Assume the output impedance is 100R at 1kHz and you have a load which is drawing an AC load current of 1mAp at 1kHz out of the output, than the output voltage of regulator is no longer constant but shows an AC ripple of 0.1Vp!

    Kai