TPS82084: TPS82084/85 maximum load capcitor

Shlomo Perlshtein

Part Number: TPS82084

Hello.

In the data sheet, there is a paragraph about output capacitor, which states "no more than 150uF"(page 11). Is that includes all the load capacitors? for example, if my load is a FPGA which requires a 330 uF capacitor- can I used this part?

over 6 years ago

0 Dorian Brillet de Cande over 6 years ago

TI__Genius 14876 points

Hello Shlomo,

To help you better, can you provide what are the requirements for your system? Voltage range, Load.
Is this big capacitor at the input of the FPGA your biggest concern?
Thank you very much!

Best Regards,

Dorian

0 Shlomo Perlshtein over 6 years ago in reply to Dorian Brillet de Cande

Intellectual 290 points

Hello Dorian,
The required voltage is 1.0V +/- 3%, output current 1.6A maximum.We need very small footprint of soultion, so we selected the TPS82084.

0 Dorian Brillet de Cande over 6 years ago in reply to Shlomo Perlshtein

TI__Genius 14876 points

Hello Shlomo,

I would recommend you have a look at this video made by TI on this topic:

www.youtube.com/watch

If you have any question, please ask.

Best Regards,

Dorian

0 Dorian Brillet de Cande over 6 years ago in reply to Dorian Brillet de Cande

TI__Genius 14876 points

Hello Shlomo,

I haven’t heard back from you.
Do you have any follow up questions?
Otherwise I will assume this video was able to answer your question. If not, just post a reply below .

Thank you,

Dorian

0 Shlomo Perlshtein over 6 years ago in reply to Dorian Brillet de Cande

Intellectual 290 points

Hello Dorian.

I apologize for the delay. I saw the video. If I understood well. the message is: Don't take the MFG recommendation for decoupling capacitor "as is" ,but calculate the real required capacitor according the PDN impedance required. Second massage- the TPS82084 will not operate well with output capacitor greater than 150uF.

I have to mention ,that I didn't understand the origin to the output voltage transient equations.please ,can you explain ?

Thanks

Shlomo

0 Omar Hegazi over 6 years ago in reply to Shlomo Perlshtein

TI__Intellectual 1780 points

Hello Shlomo,

I am filling in for Dorian, since he is away for a couple of days.

I am glad that the video helped a bit. furthermore, I think that this article can be a great read in addition to the video.

It explains how the load transient, voltage deviation, and capacitor impedance affect each other and how to select the appropriate capacitor for your application's requirements.

Best regards,

Omar

0 Shlomo Perlshtein over 6 years ago in reply to Omar Hegazi

Intellectual 290 points

Hello Omar.

thanks for the article. I read it. It added more insight. Eventually, I had met Oliver Nachbauer here in Israel, and we had discussed all the issues face to face,

Thanks all of you.

Shlomo Perlshtein

Power management

Power management forum

TPS82084: TPS82084/85 maximum load capcitor