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TPS7A20: Altium Manufacturer Part Choice

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

  • 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

  • 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