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LMC6482: Max output current when shorted to gnd?

Part Number: LMC6482

Hi team, am working with a customer on this device and had some questions:

1. What is the Maximum short circuit current on the output, when using a +5 volt rail

2. Per Page 3 foot notes 4, Output current in excess of +-30mA over long term may adversely affect reliability , so what is the Maximum current that device can produce, without damage?

  • Hello Kannan,

    The LMC6482 datasheet lists the short circuit current for V+ = 5 V as follows:

    It can be seen that the Isc is package and temperature dependent. A maximum isn't specified in the datasheet; therefore, we cannot provide a maximum. What can be said is that for a typical CMOS output stage design is the maximum Isc will decrease with increased Tj temperature, and will increase with decreased Tj temperature. The output current is self limiting because of the saturation resistance of the CMOS output transistors. A rough estimation of the high end Isc can be obtained by adding the delta between the typical and minimum, to the typical value.

    It is the maximum junction temperature Tj must be observed in order to avoid thermally induced damage and that is directly related to the power dissipation PD. The LMC6482 datasheet has a note under the Absolute Maximum ratings table:

    Applying this equation using the device and circuit conditions will tell how close the design is to the PD maximum. If PD is well below the maximum, then the device should be safe baring any unforeseen unsafe electrical stress conditions.

    Regards, Thomas

    Precision Amplifiers Applications Engineering