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LM4132-Q1: Maximum output voltage when disable

Part Number: LM4132-Q1

Hi team,

My customer asked me the maximum voltage at VREF pin when disable.

Does your team have such a data? I think VREF pin becomes Hi-Z, not low. So, I think there is no such a data. But, I appreciate if you could check if you have such a data.



  • Hi Saito,

    We do not have this type of data available. As you mentioned the LM4132-Q1 goes into high-z when the input is off because the output stage is not powered.

    The main connection to GND will be R1+R2 from the functional block diagram in 7-2. If Vout>Vin there can be leakage through Q1 and it does not have any internal reverse current protection circuitry. We do not have the value of when this will happen.

    What is the cause of the VOUT > 0V during shutdown?

  • Hi Marcoo-san,

    I just answerd it to customer based on your reply.

    I will ask you again when I need further asistance.



  • Saito-san,

    Since this thread was closed, feel free to open a new one if more questions result after you consult the customer.

    Thank you very much and good luck.