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Land pattern for S-PWQFN-N16 - TPS2540 needed



The datasheet and SLUA271 are both missing "just that one" dimension to allow me to create a decent PCB footprint for this device.

I have pad size, pad-to-pad spacing along each edge and the thermal pad requirement.  But what is the outside dimension (eg center of pin 1 to center of pin 12?)

Can someone please point me to a document that has this information? 

Thanks in advance,

David.