TPS63070: Copper foil thickness of PCB

K.Shidara

Expert 3225 points

Part Number: TPS63070

Hi Team,

Would you advise below 3 questions about heat radiation design?

Regarding TPS63070 datasheet(Section 11.2 Layout Example) or

TPS630702EVM(Section 3.1 TPS630702EVM Layout).

1.I think that the measurement of the junction temperature is based on the standard test specified by JEDEC.

Is the layout proposed in the data sheet assuming a copper foil thickness of 70um?

2.What is the via size under the choke coil L1, L1 (9 Pin) and L2 (11 Pin) terminals of TPS63070 in the

layout example? Also, is the via below the L1/L2 terminals filled with holes?

3.What are the copper foil thickness (12um/18um/35um/70um) and the number of layers

(2 layers/4 layers) of the evaluation board? Also, is there any information such as the

recommended copper foil thickness or the copper foil thickness assumed in design?

Thanks

Best regards,

Shidara

over 5 years ago

0 Helen chen over 5 years ago

TI__Mastermind 40080 points

Dear Sir,

The EVM use 4-Layer board, the top/bottom, signal layer1/signal layer2 all use 1oz(1.4 mil/35um) copper thickness.

The vias under inductor are 24mil diameter/ 8 mil hole size.

0 K.Shidara over 5 years ago in reply to Helen chen

TI__Expert 3225 points

Hi Helen-san

Thanks for your advice.

Can you have datasheet layout information below?

I could understand EVM copper thickness as 35um.

1, Is datasheet Layout also 35um expected?

2, is the vias under inductor filled with solder?

Thanks

Best regards,

Shidara

0 Helen chen over 5 years ago in reply to K.Shidara

TI__Mastermind 40080 points

Hi Shidara,

Usually, datasheet layout is based on the EVM. But if you can use 2oz/70um copper thickness, the thermal result will be even better.

The vias under(beside) inductor is tented.

0 K.Shidara over 5 years ago in reply to Helen chen

TI__Expert 3225 points

Hi Helen,

Let me clarify the via size.

TPS63070's L1(9pin) via seems smaller than the via being under inductor.

You already informed larger size is 24mil diameter/ 8 mil hole size.

Could you teach me the TPS63070's L1(9pin) via size?

Please refer the attached.

Thanks

Best regards,

Shidara

0 Helen chen over 5 years ago in reply to K.Shidara

TI__Mastermind 40080 points

Dear Sir,

The hole on pin9 is 18mil/6mil.

0 K.Shidara over 5 years ago in reply to Helen chen

TI__Expert 3225 points

Hi Helen-san

Thank you very much for your prompt reply.

Thanks,

Best regards,

Shidara

0 Helen chen over 5 years ago in reply to K.Shidara

TI__Mastermind 40080 points

You're welcome. good luck!

Power management

Power management forum

TPS63070: Copper foil thickness of PCB