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TLV62130 and bq24170 - analog/digital grounding

Camron Vossberg
Prodigy 50 points
Other Parts Discussed in Thread: BQ24170, TLV62130

I have a question about the preferred way to tie AGND and PGND on a board with 2 switching regulators (TI p/n TLV62130) and a LiPo charger IC (TI p/n BQ24170). All 3 ICs' datasheets say to tie AGND and PGND at their exposed thermal pads. I have a continuous analog/digital ground plane that spans the whole board, and in the power section of my board I have another plane for power ground. I would normally tie these two together at one point, to make sure much current isn't flowing through my analog/digital ground. It seems like tying them together in 3 places may cause problems. What is the suggested approach in this situation?

Thank you for your help!

Camron

  • 0
    TI__Guru**** 191445 points

    I would be inclined as follows: I would not use a single analog ground plane for these circuits, Usually there are just a couple analog ground terminations for each converter, the voltage set point divider, compensation termination, slow start, etc. I would connect these together for each converter separately with a small copper fill or wide etch run, then tie it to PGND at the exposed pad in at a single point for each IC.