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TPS51200: Inquiry about Pull-Up resistance value

JH Shin
Guru 12705 points

Part Number: TPS51200

Hello,

My customer inquires about the selection of pull-up resistor values for PGOOD and EN of the TPS51200.

What is the appropiate resistance value for 3.3V pull-up voltage and how to determine it?

Thank you.

JH

  • 0
    TI__Expert 5965 points

    Hi JH,

    The pull down resistance of PGOOD pin is <100 ohm. So depending on your logic level, you can select PGOOD pull up resistor 1k~100k. Of course with higher output you will have longer delay.

    EN is high impedance input, you can also select 1k~100k pull up resistance.

    With higher resistance the noise immunity will be worse. So this also needs to be considered depending on your system design.

    Regards,

    Weidong