LMR51450EVM: LMR54145 AGND interconnection question

Jerry Shen

Part Number: LMR51450EVM
Other Parts Discussed in Thread: LMR51450

Tool/software:

Hi Team,

I noticed that the LMR51450 sheet recommends separating AGDN (e.g. RT, FB pin), but the layout examples and EVB don't seem to implement this.
Could you advise on how to design AGND in the layout?

9 months ago

+1 Marshall_Beck 9 months ago

TI__Mastermind 35210 points

Hello Jerry,

Sorry for the confusion.

You can have an AGND "island" where all these passives grounds are located. Then, a single point connection can be made connecting AGND and PGND together at the AGND PIN and the DAP. The last point is shown in the layout example.

0 Jerry Shen 9 months ago in reply to Marshall_Beck

Prodigy 40 points

Hi Marshall,

Got it, thank you for your reply.

0 Marshall_Beck 9 months ago in reply to Jerry Shen

TI__Mastermind 35210 points

You are welcome.

Power management

Power management forum

LMR51450EVM: LMR54145 AGND interconnection question