TPA2028D1: Line width from WCSP pad

Ryotaro Fukui

Part Number: TPA2028D1

Hello team,

I received a question about circuit pattern of audio amp. I would appreciate it if you could take a look and give us some feedback. Any brief feedback would be fine.

Their main concern are about line width. Please refer to the following point.

Concern: Line width
As for the confirmation of the contents of the data sheet, does it mean that the width of the drawer line from the WCSP pad is 75um to 100um?
 Currently, I'm pulling out at 0.18mm, but is it too thick? If this is 100um, only about 0.1A can flow, is that okay?
 Is there a problem with 0.18mm? Is it a CSP manufacturing problem?

Best Regards,
Ryotaro Fukui

over 3 years ago

0 Justin Beigel over 3 years ago

TI__Mastermind 18545 points

Hello,

Trace widths larger than 100um are not recommended because they reduce the device stand off and can impact reliability. For your current calculation, what are you using as the copper thickness to get 0.1A with a 100um trace width?

Best Regards,
Justin Beigel

0 Ryotaro Fukui over 3 years ago in reply to Justin Beigel

TI__Intellectual 2345 points

Hello,

The thickness of the surface layer is 0.04 mm, which is slightly thicker than 1 oz (0.035 mm).

We have also sent additional materials from our customers via email, so we hope you find it helpful.

Best Regards,

Ryotaro Fukui

0 Ryotaro Fukui over 3 years ago in reply to Ryotaro Fukui

TI__Intellectual 2345 points

Hello,

We apologize for the hurry, but since the customer seems to be just before the design is completed, we would appreciate it if you could give us some feedback soon.

If possible, it would be greatly appreciated if you could give us some feedback this week. Any kind of brief comment about the "line width" and "GND shield" would be helpful for us.

Please contact us if you have any other information needed.

Best Regards,

Ryotaro Fukui

0 Justin Beigel over 3 years ago in reply to Ryotaro Fukui

TI__Mastermind 18545 points

Hello,

I saw your email and will continue the conversation there for now and will post a summary here when we are done.

Best Regards,
Justin Beigel

+1 Justin Beigel over 3 years ago in reply to Justin Beigel

TI__Mastermind 18545 points

Hello,

Summarizing from our email conversation:

It is recommended to keep the drawer line width at 100um
Adding in ground shielding is beneficial to the EMI and thermal performance of the device

Best Regards,
Justin Beigel

Because of the Thanksgiving holiday in the U.S., TI E2E™ design support forum responses may be delayed from November 25 through December 2. Thank you for your patience.

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TPA2028D1: Line width from WCSP pad