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TPS709: Max Cout?

John Garrett
Expert 4220 points
Part Number: TPS709

The max Cout mentioned in the TPS70933 data sheet is 47uF.

I have a customer who needs more capacitance at his load.  In his design, the Vout pin of the TPS70933 has two 22uF ceramic caps to ground but he wants to add a low pass RC filter off of that which consists of a 650 ohm connecting to and two 50uF caps to ground.  Is the low freq pole from this RC going to be a problem for the LDO?

Please let me know.

Thanks, John Garrett TI-AFA

  • 0
    TI__Guru 55940 points
    Hi John,

    As you state, we recommend that the maximum output capcitance be 47 uF for stability. Are you able to move this filter to the input side of the LDO? If you can, you would receive the same system level filtering without impacting the LDO loop.

    Very Respectfully,
    Ryan