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LDC1000: CLDO capacitor

K.Hamamoto
Guru 12155 points

Part Number: LDC1000

Hi

On the datasheet it is mentioned CLDO pin should be connected 56nF of capacitor from this pin to GND.
Why this capacitor should be 56nF? (I undestand this capacitor is bypass capacitor and this is related stable of internal LDO.)

On the other hand, can we change the capacitor value (i.g. 50nF? or nearly 56nF)if it possible? 

Best Regards,

Koji Hamamoto

  • 0
    TI__Genius 17440 points
    Hi Koji,

    This value of this capacitor was selected by the designers based on the internal architecture of the LDO. Do use a 56 nF capacitor with up to 5% tolerance. In future datasheet updates we will clearly state the acceptable tolerances for this capacitor.

    Regards,
  • 0 in reply to Kristin Jones93
    Guru 12155 points
    Hi Kristin-san,

    Thank you for the information.
    Please let me confirm again. Because we need to explain to the customer more detail. I understand it should be 56nF +/-5% as you mentioned. But they would like to change the capacitor to 47nF or 68nF. If it is changed to 47n or 68nF or 0.1uF,what happen to the internal LDO? What is the concerns?

    Best Regards,
    Koji Hamamoto
  • 0 in reply to K.Hamamoto
    TI__Genius 17440 points

    Hi Koji-san,

    Use of the 56nF capacitor ensures that all internal nodes are appropriately biased across all operating conditions, including the full temperature range. The customer may try using a different capacitance, but they may experience device behaviors outside of those in the datasheet specifications. 

    Is this a new design? In general, we do not recommend using the LDC1000 for new products. Section 3 of the LDC Device Selection Guide may help you choose an improved device. 

    Regards,