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LM61460-Q1: Ferrite bead instead of Resistor

Jejomar Ildefonso
Expert 8590 points
Part Number: LM61460-Q1

Hi Team,

Our customer is considering to use a ferrite bead in place of the boot resistor for LM61460-Q1. Ferrite bead specifications are 500mΩ DC, 2.2K at 100MHz. Would this work the same, better, or worse when compared to the specified characteristics of the device when 100Ω boot resistor is used?


Kind Regards,

Jejomar

  • +1
    TI__Mastermind 47060 points

    Hi Jejomar,

    The ferrite bead suggestion has not been tested for so I would suggest having customer evaluate on the LM61460-Q1EVM for this case study.

    Is there a reason why customer needs to use a ferrite bead instead of a cheap passive resistor here? 

    Also if the ferrite bead is in mΩ of resistance, then that is basically not using the slew rate feature. In that case, it would be easier to just short RBOOT to CBOOT through a 0Ω placeholder.

    Regards,

    Jimmy

  • 0 in reply to Jimmy Hua
    TI__Expert 8590 points

    Hello Jimmy,

    Our customer simply wants to know if a ferrite bead was tested and if it contributes to a better performance. We've shared your response and they've agreed to use a simple boot resistor instead for cost-efficiency. Thanks for your support!


    Kind Regards,

    Jejomar

  • +1 in reply to Jejomar Ildefonso
    TI__Mastermind 47060 points

    Hi Jejomar,

    Thanks for the clarification and good to know that they agreed to use the simple boot resistor.

    Thank you for using the E2E forum.

    Regards,

    Jimmy