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LM2940-N: Replacement of LM2941LD with LM2940LD

Heiko Lorenz
Prodigy 40 points
Part Number: LM2940-N

Hi TI-Team,

because of allocation of LM2941LD in a design with Vout=5V, I think about the plug-in replacement with LM2940LD-5.0/NOPB.

The datasheet of LM2940LD describes, that Pin6 an Pin5 have to be connected on PCB. 

In our LM2941LD Design, Pin 6 is not connected.

Is it possible to use LM2940LD with Pin 6 left open?

Which effects would this generate?

Regards,

H.Lorenz

  • TI__Mastermind 38155 points

    Hi, 

    I am checking to make sure that both pins 5 and 6 are connected to the same net internally. If they are then the device will still be functional with pin 6 left open, but the parasitics of the package will be increased because of the reduction of the number of bond wires so the peak current that the device can handle may be reduced since the current is split between less bond wires so each bond wire would be closer to its fusing current. If they are not the same net but should be tied together, this might be more of a problem.

    Please give a 2-3 business days to get back to you on this.

    Thanks,

    Nick

  • in reply to Nick Butts
    Prodigy 40 points

    Hi Nick, 

    could you check my questian regarding the LM2940LD?

    Thanks,

    Heiko

  • in reply to Heiko Lorenz
    TI__Mastermind 38155 points

    Hi Heiko,

    Sorry for the delay - I forgot to make a note to look more into this.

    From the information I have available to me, I think Pin 6 is a sense pin for the output to calibrate out the IR drop from the bond wires for the output. So, leaving Pin 6 floating will likely cause the device to be unable to properly regulate. 

    Regards,

    Nick