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LM51231-Q1: About bias on PG when power off

Ryoma Ohashi
Expert 5085 points
Part Number: LM51231-Q1

Tool/software:

Hi team,

When no power supply on BIAS (8 pin), is it allowed to pull up PGOOD with external 3.3V? Any concern on the reverse current flow from PG pin?

Regards

  • +1
    TI__Genius 15855 points

    Hi Ryoma,

    Thanks for reaching out.

    You should make sure that you stay within the abs max ratings. In this case, the voltage at PGOOD cannot be higher than Vout+0.3V.
    However, when using a pullup resistor with 10k, nothing will be damaged.

    Best regards

    Moritz