TPSM63602: recommended layout inquiry

gang huang

Prodigy 230 points

Part Number: TPSM63602
Other Parts Discussed in Thread: TPSM63603EVM

For the chip TPSM63602,

1. the data sheet give a recommended layout, but that does not connect the VOUT pins to the FB and VLDOIN pins,

I want to know what is the recommended approach to connect them? using via on another layer? or trace from outside;

2 for the VIN on the two side, should I connected myself on the pcb board or they are internal connected?

3. To connect the VCC to PGND, the data sheet asking for a high quality 1-μF ceramic capacitor, will a X5R considered as a high quality capacitor? Such as GRM033R61C105ME15D good enough?

over 1 year ago

0 Andrew Kutzler over 1 year ago

TI__Genius 15590 points

Hi Gang,

1. FB is connected to VOUT through a via on another layer.

You're right that VLDOIN is not connected to anything. It should be connected to GND or VOUT depending on what output voltage is needed for the application. You can connect it to VOUT with a via.

2. It looks like they are connected on another layer. There's 3 vias on each VIN plain.

3. Going off of a more modern datasheet, they define high quality as X7R or better. I would personally recommend using an X7R or better. However, the TPSM63603EVM does use an X5R (EMK105BJ105KVHF) for that design which was tested and validated by our team.

Thanks,

Andrew

0 gang huang over 1 year ago in reply to Andrew Kutzler

Prodigy 230 points

Thank you for your reply.

Can you comment on the GRM033R61C105ME15D I mentioned earlier? That is an X5R 0201 capacitor: https://search.murata.co.jp/Ceramy/image/img/A01X/G101/ENG/GRM033R61C105ME15-01A.pdf.

I am using this chip to convert 12V to 6.3V and I have a layout as attached. The red is the top layer; the green one is the gnd layer directly under the top; the brown is the next layer below. Would you please comment on this? Especially the vin plan arrangement.

+1 Andrew Kutzler over 1 year ago in reply to gang huang

TI__Genius 15590 points

Hi Gang,

Yeah, GRM033R61C105ME15D should be fine. I trust that a Japanese MLCC manufacturer like Murata or TDK to provide a reliable part.

For the layout it looks good. My only suggestion would be to swap the position of C84 and C82. That way the Low ESR component is as close to VIN as possible.

Thanks,
Andrew

0 gang huang over 1 year ago in reply to Andrew Kutzler

Prodigy 230 points

@Andrew Thank you for the suggestion, and updated.

0 Andrew Kutzler over 1 year ago in reply to gang huang

TI__Genius 15590 points

Gang,

Glad I could help.

Have a nice day!

Thanks,

Andrew

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TPSM63602: recommended layout inquiry