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LM3409: Maximum admissible voltage on IADJ pin

Pascal PELLIZZONI
Prodigy 50 points
Part Number: LM3409

Hello everyone,

I would want to know the maximum admissible voltage on IADJ pin. Indeed, the datasheet only indicates that voltage on IADJ pin is clamped by an internal 1.24V zener (see figure 20), so what would happen if a superior voltage is applied (eg 5V)?

In absolute maximum rating, it is indicated that maximum current on IADJ is +/5 mA.

So, my first reflex would be to simulate with PSpice and find the voltage that would induce 5mA current in IADJ pin.

Am I correct ?

Thanks a lot in advance.

  • 0
    TI__Mastermind 18550 points

    Hi Pascal,

    There is a zener type clamp internal at about 1.24V so if your are going to apply a voltage that is above 1.24V then you will need a series resistor to the IADJ pin such that it limits the current into IADJ to less than +/-5mA as stated in the data sheet.  

    Thanks Tuan