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[ ATL432BD ] design consideration of Max Reference Input Current

Paul Kim
Intellectual 1430 points

Hi Team

when designing ATL432B,

we has to make the current flowing into REF pin at least more than Max Iref = 150 nA regardless of Shunt regulator(close loop) mode and Comparator mode(open loop), in order to ensure ATL432B's correct operation ?

  • 0
    TI__Mastermind 24485 points
    Hello Paul,

    Actually, you do not design the device to consume a specific amount of reference current.
    So, in short, no you should not design the ATL such that there is more than 150nA flowing into the reference.
    This specification is to give an idea of what current the reference will consume when operating, and is not a specification that you specifically design to acheive.

    What you do need to design for is cathode current. As opposed to the reference current, which consumes what it needs to in order to operate, the cathode current needs to be designed for.
    In this case, the Imin specification is what you want to look at. the Imin(MAX) value is 35 uA, so you want to make sure to design the system so that the cathode current exceeds 35uA, and typically we recommend even higher to ensure operation across process and temperature.

    Does this help to clarify?
    Please feel free to let me know if you have additional questions.

    Best,
    Michael