CSD18531Q5A: thermal design

Masaoki Koide

Part Number: CSD18531Q5A

Dear Sir,

Our customer would like to have documents about thermal design for CSD18531 describing relation between stencil area and thermal resistance. Are there any documents except for datasheet? Please advise.

Regards,

Koide

over 7 years ago

0 Brett Barr1 over 7 years ago

TI__Mastermind 18200 points

Koide-san,

I do not believe we have any official documents but I have reached out to our packaging team for comment. I will let you know their reply.

0 Brett Barr1 over 7 years ago in reply to Brett Barr1

TI__Mastermind 18200 points

Koide-san,

Here was the response we got from one of our packaging engineers:

"We have no document but we have done a study that the impact is more on the voids of the solder.

If the voids is above 50%, the thermal resistance starts to shift"

0 Masaoki Koide over 7 years ago in reply to Brett Barr1

Intellectual 580 points

Brett-san,

Thank you for the feedback. I'll inform our customer. Thank you!

Regards,
Koide

0 Masaoki Koide over 7 years ago in reply to Masaoki Koide

Intellectual 580 points

Brett-san,

I have one more question. Do you have ΨJT and ΨJB value of CSD18531Q5A? Please advise.

Regards,

Koide

0 Brett Barr1 over 7 years ago in reply to Masaoki Koide

TI__Mastermind 18200 points

These are not parameters we measure.

0 Masaoki Koide over 7 years ago in reply to Brett Barr1

Intellectual 580 points

Brett-san,

Thank you for the feedback. Do you have any Ψ data for the other Q5A package devices? I would like to use them for the reference.

Regards,
Koide

0 Brett Barr1 over 7 years ago in reply to Masaoki Koide

TI__Mastermind 18200 points

Koide-san,

This is not a common parameter in the FET industry and not something we have ever measured. Can you please provide a definition of the term?

0 Masaoki Koide over 7 years ago in reply to Brett Barr1

Intellectual 580 points

Brett-san,

Thank you for your advice. I'm sorry that I don't know about FET well. Do you mean Ψ definition?
If so, I'm referring the following documents.

www.ti.com/.../slrr012.pdf
www.ti.com/.../spra953c.pdf

Regards,
Koide

0 Brett Barr1 over 7 years ago in reply to Masaoki Koide

TI__Mastermind 18200 points

Koide-san,
Let me discuss with our characterization team to see if this is something we can provide

0 Masaoki Koide over 7 years ago in reply to Brett Barr1

Intellectual 580 points

Brett-san,

Thank you for your cooperation. I'm looking forward to hearing from you.

Regards,
Koide

0 Brett Barr1 over 7 years ago in reply to Masaoki Koide

TI__Mastermind 18200 points

Koide-san,
Our characterization team wasn't sure how this Psi junction to top parameter was that different from a standard Rth junction to top measurement. For a 5x6 QFN, these are typically 10 - 15deg C/W

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CSD18531Q5A: thermal design