TPSM843320: How to connect AGND and PGND

Hi Noriyuki-san, 

Noriyuki Takahashi said:

However, the EVM user's guide recommend to connect AGND and PGND with the single point net tie as below. Which should they follow, datasheet or users guide?

This is the utter minimum way of connecting both AGND and PGND. 

You can use either. The above method is the easier way to do so. 

Regards,

Gautam

Gautam,

Thanks, but could you tell the pros and cons of both ways, connecting  AGND and PGND with multiple vias and  connecting AGND and PGND with the single point net tie? They need to understand these to select the one.

Regards

Noriyuki Takahashi

It's not about Pros and Cons; it's about a single point of contact. Both end up achieving the same. EVM demo showcases one of the variant to TI customers.

Regards,

Gautam 

Hi Gautam-san,

I am the one who asked Noriyuki-san this question.
Thank you for your support on this matter.
I would like to ask you additional questions about TPSM843320 and TPS56838.

(Q1) Can we use 0-ohm chip resistor, actually it has maximum 50m-ohm resistance, as a method of connecting AGND and PGND instead of tying them  with a net, reagardless of a single or multipul connected points?
However, in this case, inner layer connections will be impossible.

(Q2)Could you tell us the appropriate place to connect AGND and PGND for the each case of a single point and multiple points connection? 
For example, it is like the place far from VIN and VOUT, or more detailed lacation.

Regards,

Katsuhiro Uchida

Hi Gautam-san,

Thank you for your reply.
According to your answer (A1) and (A2), we will follow the EVM layout overall due to  (A2) and we might place the 0-ohm resistor for the connecting point  of  AGND and  PGND due to (A1).

Regards,
Katsuhiro Uchida