TPS61322: Handling of NC pins

Y.Ottey

Part Number: TPS61322

Dear all,

I would like to ask about NC pin of TPS61322DBV.

When I check the data sheet and EVM circuit, they are connected to GND or Vout as follows.

From the following post, I understand that it's okay to leave the NC pin floating or connect it to something other than GND or Vout.

https://e2e.ti.com/support/power-management/f/196/t/886045?tisearch=e2e-quicksearch&keymatch=TPS61322%20NC

I would like to know the intention to connect to GND or Vout.

For example, is there a reason why connecting to GND improves the heat dissipation characteristics or the electrical characteristics?

Best Regards,

Y.Ottey

over 4 years ago

0 Minqiu Xie over 4 years ago

TI__Mastermind 21565 points

Hi Y.Otty:

Yes, it could improve the heat dissipation like adding some VIAs.

But honest speaking, I suspect the main intention is: it's just in the route, and we don't want to detour.

0 Y.Ottey over 4 years ago in reply to Minqiu Xie

Mastermind 6145 points

Hi Miniqu

Thank you for your reply.

I would like to ask adding question about your answer.

"it's just in the route, and we don't want to detour."

As mentioned above, what does this mean?
I would be happy if you could tell me in detail.

Regards,

Y.Ottey

0 Minqiu Xie over 4 years ago in reply to Y.Ottey

TI__Mastermind 21565 points

Hi Y.Ottey:

Sorry for making you confused.

I just want to say: assume there is no such NC pin, the layout will remains the same. But if you define the NC pin to another net, the layout will change, and that's not our preference.

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TPS61322: Handling of NC pins