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Original question:

TPS7A92: Filter and output capacitor question

TPS7A92: TPS7A92 Input and output capacitor question

Cheney_Sun
Intellectual 595 points
Part Number: TPS7A92
Other Parts Discussed in Thread: TPS7A91, TPS7A91EVM-831

Hello LDO TEAM

When I use LDO TPS7A92 ,input voltage 5V  and output voltage is 3.3V.

The input capcitor is one 10uF/25V MLCC in parallel with one 220uF/16V AL CAP.

While output capcitor is one 10u/25V MLCC CAP in parallel with one 220uF/16V AL CAP.and the load current is about 500mA.

Please help to make sure that the input and output capcitor meet the requirements of circuit  stability

Very Respectfully

Cheney_Sun

  • 0
    TI__Guru 55940 points
    Hi Cheney,

    You are exceeding the minimum capacitor requirement for stability; therefore, your intended capacitors are good candidates to consider.
    We do recommend prototyping in order to ensure that the capacitor selection with the TPS7A92 meets your specific application requirements.
    If you perform your worst case expected load transient while monitoring the output of the TPS7A92, you will be able to estimate your application's stability as described in the following application report.

    www.ti.com/.../slva381b.pdf

    TPS7A91EVM-831 can be used for a first pass prototype in order to test your intended capacitors. TPS7A91 is the 1 A version of TPS7A92 and is pin to pin compatible. You can either swap out the IC on the EVM or perform the bench tests on the TPS7A91. Since your application only requires 500 mA, you may wish to consider using TPS7A91 for this rail.

    Very Respectfully,
    Ryan
  • 0 in reply to Ryan Eslinger
    Intellectual 595 points
    Hi Ryan:
    Thank you very much.
    Best Regards
    Cheney_Sun