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ATL431LI: max sink current

Ding Li
Prodigy 150 points
Part Number: ATL431LI

For ATL431LI, DQN package (X2SON (4)), at 9V cathode voltage, board temp 70C, how much current can the device sink?

 

I calculated (150ºC - 70ºC) / 119.9C/W / 9V = 74mA. Could you please confirm? Datasheet says 15mA but didn’t specify condition.

Datasheet page 12 says "A Darlington pair is used in order for this device to be able to sink a maximum current of 15 mA"  

Why 15mA only?

  • 0
    TI__Mastermind 19370 points

    HI Ding Li,

    The maximum cathode current under any condition is 15mA. If the calculated current value is greater than the maximum allowed current then there should be minimal to no issue with sinking 15mA. In this case 74 mA > 15mA so it should be able to source 15mA . Keep in mind that the thermal information was created using a JEDEC board with the thermal pad of the X2SON package going into a thermal layer.

    The ATL431LI is a low current device and so a darlington pair transistor was used to current boost the output to 15mA but it is still limited to 15mA. This is because a larger transistor would increase the die size and not fit in the X2SON package.

    Do you need more than 15mA?

    What application is this for?

    -Marcoo