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REF02: What happens if the sink current exceeds the datasheet limit?

Nick U
Prodigy 20 points
Part Number: REF02
Other Parts Discussed in Thread: REF50, REF50E

Tool/software:

What happens to the output of the REF02 if a higher current is sunk into the output pin?

As an example, if a 10k resistor is connected between the output pin and a 30V source. This would presumably require the REF02 to sink 2.5mA, but the datasheet says a typical sinking load current is 0.5mA - but this is not listed as an "absolute maximum". What does the output do in this situation?

  • 0
    TI__Expert 8920 points

    Hi Nick,

    I believe this is the section of the datasheet that you are referring to:

    I would understand this as the datasheet is reporting that for REF02, each device will be able to sink up to at least 0.3 mA, but some devices could sink up to 0.5 mA. Similarly, the datasheet is reporting that for REF02, each device will be able to source up to at least 10 mA, but some devices could source up to 21 mA.

    For this reason, if you would like to sink 2.5 mA of current, I would recommend one of the following devices from the REF50 or REF50E family:

    REF5050AIDR (Pin-to-pin): Can source and sink up to 10mA of current. Better temperature drift, initial accuracy, quiescent current, and long-term stability than REF02 as well.

    REF5050EIDR (Pin-to-pin): Can source and sink up to 10mA of current. Improves upon all other specifications of REF02 as well.

    Thanks,

    Jackson

  • 0 in reply to Jackson Wightman
    Prodigy 20 points

    Thanks for the suggestion, but I would like to understand what would actually happen. This is not a feature I *want* to utilize, it's a consequence of a (transient) error state that my circuit may encounter under specific circumstances. I only want to know how the chip will behave in this error state.

    My thoughts are that doing this could potentially damage the chip, or maybe the output voltage rises above the 5V setpoint with increasing current sunk through the pin? (For reference, the REF02 will be powered by that same 30V I mention in the above scenario)

    Thank you!

  • +1 in reply to Nick U
    TI__Expert 8920 points

    Hi Nick,

    Got it, thanks for the clarification. Beyond the source and sink current that is reported in the datasheet, we cannot guarantee that REF02 would operate correctly or that there would be no damage to the device. For this reason, I would recommend using one of the devices I suggested above which can be used on the same PCB footprint as REF02 since they are pin to pin. If it is being powered by 30V, REF5050EIDR is the best option.

    Thanks,

    Jackson