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SRC4190-Q1: Decupling capacitor recommendation

Kazuki Kuramochi
Genius 10785 points
Part Number: SRC4190-Q1


Hello Expert,

My  customer is using SRC4190-Q1.
Also they are considering to optimize their system's cost now.

Then, they are confirming the possibility of removing 10uF decupling capacitor with SRC4190-Q1 even though our recommendation on datasheet is 0.1uF and 10uF.
Would you answer following quetions?

  1. Would you tell me why you recommend to use not only 0.1uF but also 10uF?
  2. Can we use SRC4190-Q1 only with 0.1uF?
  3. If there is any concern when we use SRC4190-Q1 only with 0.1uF, would you tell me detailed concern?

I'm looking forward to hearing back from you.

Thank you and best regards,
Kazuki Kuramochi

  • +1
    TI__Guru** 110905 points

    Hi Kuramochi-san,

    The bulk capacitance helps as local charge reservoir, it basically reduces potential peaks and droops on the supply due to variations at the source and from device operation consumption. If planning to remove these I'd suggest to test by transitioning the device from no activity to as high consumption as possible. Keep the footprint available as placeholder and you may try some other cap values like 2.2uF or 1uF if the performance is not good after removing the 10uF.

    Best regards,
    -Ivan Salazar
    Applications Engineer