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TPS7A03: About PSRR and Cout

Luke Sakamoto
Intellectual 1575 points
Part Number: TPS7A03

Hi LDO team,

My customer would like to know if the below chart is only when Cout>1uF.

Or is just the characteristic of the IC?

Thanks,

Luke

  • 0
    TI__Genius 12511 points

    Hi Luke,

    PSRR low frequencies, up to about 100kHz, is largely independent upon COUT. COUT does impact higher frequencies. This range is outside the bandwidth of the LDO, and is largely up to the independent customer and the specific use case. Below attached is an example of drastically different COUT configurations showing very similar performance at low frequencies and deviate at the higher frequencies. This device is stable with an effective output capacitance > 0.5uF.

    Regards,

    John