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Original question:

TPS7A20: Asking for the TPS7A2018P design question

TPS7A20: Altium Manufacturer Part Choice

Marco Rojas
Intellectual 1980 points
Part Number: TPS7A20

Hey team,

I'm doing a power project for my FAE rotation, and I'm brand new to Altium in which we will do a PCB design and layout. I see there are a ton of options in the Manufacturer Part Search, but only a couple that I'm able to download. I was wondering if there was a downloadable PN that your team suggests that is footprint-conscious (and has good availability, as I'm sure that's a worthy parameter in this project simulation).

Also feel free to stop me where I am and point me to a different direction if there's other steps I need to take in Altium before preparing my board with these parts. It's part of a power tree that has a 3.3V to 1.8V 0.2A rail, keeping cost as a key careabout (but with concern of 3% undershoot/overshoot transient on 25% to/from 75% load)

Thanks in advance for the assistance!

Marco A Rojas

  • +1
    TI__Expert 4930 points

    Hey Marco,

    Just to verify, do you need to download the footprint for Altium for our LDOs?

    If so, you can go to TPS7A20 product folder.

    In the "Design & development" section click on "CAD/CAE symbols" and select the package option you need.

    Click on "Choose CAD Formats & Download."

    Click on the "Altium" drop down and make your selection. Finish up by clicking submit.

    After you download the footprint you will be sent to a new window with steps to bring the TPS7A20 into your Altium library.

    Now regarding the transient of TPS7A20 from 50mA to 150mA (and back), allow me 1 to 2 days to get you an answer. 

    Regards,

    Andres

  • +1
    TI__Expert 4930 points

    Hey Marco,

    I have some more information regarding the overshoot/undershoot voltage during transients. Please see the graphs below for TPS7A20 with Vout=2.8V, Cin=Cout=1uF.

    Some parameters which have an effect on the output will be the load difference, in these examples the load difference is larger than your scenario. Also, the rising/falling time will affect the under/overshoot in an inverse relationship. That is, as the rising time decreases, the undershoot voltage increases.

    Also, the output voltage will have an effect on under/overshoot; if the output voltage is larger so will be the over/undershoot voltage.

    In your case of 25% to 75% load with Vout=1.8V your under/overshoot should be lower than the graphs shown above with similar rising/falling times. 

    Regards,

    Andres