TPS60131 PAD

G.Y. Hanna

Prodigy 70 points

Other Parts Discussed in Thread: TPS60131, TPS60150, TPS63030, TPS61070, TPS61253, TPS61240, TPS62230, TPS63010

On the TPS60131, does the PAD need to be attached to the GND or left floating?

over 13 years ago

0 Richard Elmquist over 13 years ago

TI__Mastermind 45250 points

The TPS60131 PowerPad should be connected to GND as shown in the EVM schematic on page 2-2 (http://www.ti.com/lit/ug/slvu022/slvu022.pdf).

There is also additional information concerning TI's PowerPad package at the following links:

http://www.ti.com/lit/an/slma002g/slma002g.pdf

http://www.ti.com/lit/an/slma004b/slma004b.pdf

http://www.ti.com/lit/an/sloa120/sloa120.pdf

Please let me know if you have any additional information.

Richard Elmquist

0 Luiz Berro over 11 years ago in reply to Richard Elmquist

Intellectual 310 points

Sorry Richard, but there is no information in the datasheet telling to connect the power pad to GND. The schematics in the datasheet don't have pad pins.

If you look at the recommended PCB layout you will see total isolation of the power pad in the top layer, what makes no sense because the intention of the pad almost always is to be connected to GND and make a very low thermal resistance.

As long as I could search there are absolutely no information regarding the electrical connection of the power pad.

Please help me, I intend to use it in my product.

0 Chris Glaser over 11 years ago in reply to Luiz Berro

TI__Guru*** 147960 points

You are correct that the datasheet contains no information about this as it is assumed to be known to be connected to GND. Thus, Richard answered this question and now all know. The EVM shows the connection to ground in its schematic: http://www.ti.com/lit/ug/slvu022/slvu022.pdf

I would ask what power requirements you have that make you want to use such an old device? Our TPS60150 is our newest charge pump family and is much smaller. Additionally, we have the TPS630xx family of buck boost converters.

0 Luiz Berro over 11 years ago in reply to Chris Glaser

Intellectual 310 points

The EVM also isolates the power pad from the GND in the top layer. I thought that connecting the pad to GND using only 5 vias would be a huge thermal resistance.

I am using TPS60131 because of it simplicity (inductorless) covering my application light load (300mA).

TPS630xx = too complex for my simple load.

TPS60150 = 140mA won't suffice.

0 Chris Glaser over 11 years ago in reply to Luiz Berro

TI__Guru*** 147960 points

The back of the EVM is a ground plane, so that provides great heatsinking through the vias.

0 Luiz Berro over 11 years ago in reply to Chris Glaser

Intellectual 310 points

Thank you very much Chris!

I am studying TPS63030 right now. It is a little more complex, but has far more efficiency. Maybe it could be my double choice for:

Lion (3V to 4.2V) or USB (5V ) to 3.3V (only 100mA).
Lion (3V to 4.2V) or USB (5V ) to 5V (only 300mA).

Do you have any better suggestion in mind?

Best regards

0 Chris Glaser over 11 years ago in reply to Luiz Berro

TI__Guru*** 147960 points

Yes, the TPS63010 could work for all 4 converters needed but I would only recommend it for the 5V to 5V one, as that is the only one that requires a buck boost. You might use a regular boost, like TPS61070 or TPS61253 or TPS61240 for making the 5V rail. Then, a simple buck like TPS62230 family can get you 3.3V from 5V. You can find more devices at the power quick search at power.ti.com.

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TPS60131 PAD