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How to create library part with thermal pad?

Former Member

Hi there,

 

I was hoping someone could give me the recommended flow for creating a

library package with a thermal pad.  I'm using an LME49600TS/NOPBLME49600TS/NOPB which has 5

pins and a thermal pad.  The pad is electrically connected internally

to Vee.

 

I initially tried just marking a tStop region in the shape of the pad

hoping that if I just drew a polygon over it in the layout editor and

hit ratsnest, all would work out.  All I got was a polygon around the

pad not connected to it.

 

I then tried to draw a polygon in the package and name it something but

I discovered you can't name polygons.  A square pad would work I guess

but this isn't the shape of the pad which is in the shape of a 'T'.

 

Any pointers on the correct way of doing this?  The demo board doesn't

have the pad polygon connected to the Vee pin so that shouldn't be an

issue.

 

Thanks, Shareef.

 

 

Parents Reply
  • in reply to Former Member

    On 2011-02-26 16:31:22 +0000, Doug said:

     

    When you tried to make a polygon in the editor did you give it the net name?

     

    When I created the library part, the package didn't have a name for the

    thermal pad.  You can't assign a name to a polygon in the library

    package editor which was my problem.  You can do that with a pad, but

    the pad can only be rectangular and not the T shape that is required.

     

    Thanks.

     

     

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