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LMC6482: Absolute maximum current at output pin through output body diodes

Florian Boehm
Prodigy 20 points
Part Number: LMC6482

Dear Ladies and Gentleman,

 

for dimensioning a protection resistor against output shorts to supply where voltage at output pin is higher than V+ + 0.3V we have the following question:

What is the maximum current which is allowed to flow through the output body diodes ?

 

Thanks and best regards,

Florian

  • 0
    TI__Guru* 93105 points

    Hi Florian,

    The LMC6482 is a CMOS op amp and the output MOSFETs have body diodes that are reverse biased in normal operation. In addition to the body diodes, for added ESD handling protection, there are current steering diodes from the output pin to each supply pin that connect across the body diodes. Thus, if the output is taken to a voltage level such that the body diode and ESD diode become forward biased current can flow through both of them. One or the other will be less able to handle a high forward current level and its is probably safe to assume it will be the ESD diode. 

    The LMC6482 has similar input ESD diodes as the output, and the maximum input current is listed as +/-5 mA. That is dictated by the diodes.That would be a very safe current maximum to use for the body diode/ output ESD diode fault condition that you are considering. 

    Regards, Thomas

    Precision Amplifiers Applications Engineering

  • 0 in reply to Thomas Kuehl
    Prodigy 20 points

    Hi Thomas,

    thanks a lot for the fast and very helpful answer.

    Best regards,

    Florian