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LP87524J-Q1: Output Capacitor

DongHyun Lee
Prodigy 110 points
Part Number: LP87524J-Q1


Tool/software:

Hello,

According to the datasheet of LP87524J-Q1, the following output capacitors are recommended.

However, we are planning to use different capacitors for our application.

We would like to get your confirmation on whether our selected capacitors are acceptable.

We would appreciate your feedback on the two inquiries below:

  1. We are considering using Taiyo Yuden MCASJ31LAB7226KTNA01 as an alternative to the recommended output capacitors. The main differences appear to be the rated voltage and ESR, but given our output voltage level, we do not expect any issues with the rated voltage. Could you please confirm if this capacitor is acceptable or if there are any potential concerns?

  2. For a 3.3V output rail with a maximum load current of 50mA, we are planning to use a 10uF output capacitor instead of 22uF. Due to the low current, we believe this should be sufficient. Could you please confirm whether this is acceptable?

Thank you in advance for your support.

  • 0
    TI__Guru* 78551 points

    Hi DongHyun, 

    I will have our device expert look into this but with local holiday it may be early next week before we have the answer. 

    Regards,

    Katie

  • +1 in reply to Katie Pier
    TI__Genius 17930 points

    Hi DongHyun,

    DongHyun Lee said:
    We are considering using Taiyo Yuden MCASJ31LAB7226KTNA01 as an alternative to the recommended output capacitors. The main differences appear to be the rated voltage and ESR, but given our output voltage level, we do not expect any issues with the rated voltage. Could you please confirm if this capacitor is acceptable or if there are any potential concerns?

    Characteristics look very similar so can be used as an alternative component.  

    DongHyun Lee said:
    For a 3.3V output rail with a maximum load current of 50mA, we are planning to use a 10uF output capacitor instead of 22uF. Due to the low current, we believe this should be sufficient. Could you please confirm whether this is acceptable?

    In DS, the minimum value for local capacitance recommended is 10uF and this is effective capacitance. So if you consider derating and tolerance of capacitance then I would suggest use 22uF typical recommended one. If there is some specific reason to stick to 10uF then may be add one 4.7uF in parallel to it. 

    Regards,

    Ishtiaque  

  • 0 in reply to Ishtiaque Panhwar
    Prodigy 110 points

    Thank you for your response to the first question. Regarding the second question, can we consider TI's confirmation valid for using a combination of 10uF + 4.7uF on the 3.3V rail?

  • 0 in reply to DongHyun Lee
    TI__Genius 17930 points

    Hi,

    Yes I think so that's what I said earlier. Instead of using two caps, why don't you just use the one 22uF. 

    Regards,

    Ishtiaque