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TPS548A28: Can I use TPS548A28 as ASIC core supply?

ni yong
Prodigy 80 points
Part Number: TPS548A28
Other Parts Discussed in Thread: TPS548A20,

Hi Expert

I am using TPS548A20 in my design to provide ASIC core supply, the voltage is 0.8V, 8A maxiam, 6A RMS. I am searching a new component to replace TPS548A20, and find TPS548A28 could match my requirement.

In my design, input voltage is 12V , output is 0.8V, ASIC max load is 8A, RMS is 6A. When I used Webench to generate a demo schematic, I found there is a Alert that the ripple could not meet design requirement. Therefore, I have some questions need TI's expert help to answer.

1. Can use TPS548A28 to generate 0.8V? Just to replace TPS548A20. What is the key difference between the two parts for my design?

2. The ripple can not meet requirement is base on the software default ripple is 1%, is that right?

3. For 0.8V output, TPS548A20 must work with 600KHz due to its duty cycle limitation, through the software I knew it, that is mandatory, right?

4. If I want to use the remote sense feature, do I need to take care of something more than description of datasheet?

Thanks a lot

  • 0
    TI__Mastermind 23985 points

    1. Can use TPS548A28 to generate 0.8V? Just to replace TPS548A20. What is the key difference between the two parts for my design?

    Yes, the tps548a28 can generate 0.8V, package size and maximum input voltage are differences.   

    Attached is a comparison.

    tps548a28_8a20_Compareproducts.pdf

    2. The ripple can not meet requirement is base on the software default ripple is 1%, is that right?

    The TPS548A28 can meet the ripple requirement.     Click the close on the warning window and go to the left panel and click custom output specs, set ripple requirement and click redesign

    3. For 0.8V output, TPS548A20 must work with 600KHz due to its duty cycle limitation, through the software I knew it, that is mandatory, right?

    the devices have a minimum on time.  The maximum input voltage, output voltage and on time limit the maximum switching frequency. 

    4. If I want to use the remote sense feature, do I need to take care of something more than description of datasheet?

         follow the remote sense recommendations in the datasheet, review the evm pcb layout as an example.