TPS63001: PCB layout for TPS63001

Michael Hsu

Other Parts Discussed in Thread: TPS63001

art Number: TPS63001

Dear TI team and others,

I would like to verify that my board layout using TPS63001 (3.3 V fixed-output buck-boost regulator used with a single-cell Li-ion battery source) is correct.

I've attached the schematic and PCB layout as two images as the following. All pins and tracks are labeled. Red tracks are on top layer, blue ones are on bottom layer.

Do you recommend any further changes in general for the overall design before I submit this layout for production?

I'll appreciate any help/recommendation you provided.

Thank you very much.

over 8 years ago

0 Sabrina over 8 years ago

TI__Expert 8420 points

I would need more information to complete the review:
Could post the components values? capacitor (capacitance and voltage rating), inductance current rating...etc

Regarding the layout, it looks like the datasheet guidelines have been followed, the input and output capacitors are paced as close as possible to the device, the ground connection looks fine. However I would recommend to add some vias on the GND pad of the device.

0 Michael Hsu over 8 years ago in reply to Sabrina

Prodigy 60 points

Thank you for replying!
The inductance will be NR3015T2R2M.
Value: 2.2uH
Max DC current: 1.48A
Max DC resistor: 60mOhm

Capacitors will be 6.3V, 0603, X7R ceramic.

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Does this look better?

0 Sabrina over 8 years ago in reply to Michael Hsu

TI__Expert 8420 points

Inductor looks fine,
Regarding the capacitors, I don't know if I miss something but I don't find the capacitance values for C7 and C8..?

Could you share some details on the end application ?

0 Michael Hsu over 8 years ago in reply to Sabrina

Prodigy 60 points

C7 and C8 are both 10uF.
The end application is to use a ATMega328 as MCU to drive 1602 display, nRF24L01 RF transmitter and IR LED as an IR remote controller. Power is an 18650 Li-ion battery or regulated DC 5V.

0 Sabrina over 8 years ago in reply to Michael Hsu

TI__Expert 8420 points

In my opinion 10uF is not enough for C8. I would recommend to use around 15uF output capacitance (including DC bias)

0 Michael Hsu over 8 years ago in reply to Sabrina

Prodigy 60 points

Does 22uF work?

Or does replacing C8 with two 10uF X7R capaciters work?

Like this

Inside dash-line rectangle is the GND copper pour.

0 Sabrina over 8 years ago in reply to Michael Hsu

TI__Expert 8420 points

2*10uF should be fine in my opinion, did you check the DC bias curve of this capacitor?

0 Michael Hsu over 8 years ago in reply to Sabrina

Prodigy 60 points

I'm planning to use Yageo X7R capacities, but I can only find the curve for X5R.

0 Sabrina over 8 years ago in reply to Michael Hsu

TI__Expert 8420 points

The above cure shows that with a 0603 package there is only 3uF left, this is not enough
I would recommend a combination of output capacitor where enough output capacitance (nominal 15uF) is left at 5V

For example 10uF (10V)+22uF (10V), but of course this depends on the DC bias curves of the capacitor

0 Michael Hsu over 8 years ago in reply to Sabrina

Prodigy 60 points

Well noted.
Thank you.

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TPS63001: PCB layout for TPS63001