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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

  • Am 26.02.2011 14:22, schrieb Shareef Jalloq:

    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.

     

     

    Attached the device as example.

    Set in DRC menu | Clearance | Same Signals | SMD - SMD  to 0.0mm.

     

     

    Mit freundlichen Grüßen / Best regards

     

    Alfred Zaffran

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  • in reply to Former Member

    On 2011-02-28 07:48:11 +0000, A. Zaffran said:

    Attached the device as example.

    Set in DRC menu | Clearance | Same Signals | SMD - SMD  to 0.0mm.

     

     

    Alfred Zaffran

     

    Thanks a lot.

     

     

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