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TPS22990: TI.Load-Switch Parallel design requirement for higher current output

Neil Chen
Prodigy 40 points
Part Number: TPS22990
Other Parts Discussed in Thread: TPS22959,

Tool/software:

Hi Sirs, 

My project will plan use load-switch solution and adopt parallel multiple chips to achieve higher current output requirements, after survey to get this one link : https://www.ti.com/lit/ug/tidu859/tidu859.pdf 

Based on this one shared link, I have a few question to asking as lists and please free feel to give any feedback on here, tks you!! 

1. Does TI all of the load-switch can use parallel multiple chips to achieve higher current? Or, have any product limitation document on your AE internal? 

2. Based on shared link about secion1.2 - Triple TPS22959 : [as snapshot picture] 

(a) How to calculate the maximum output current can suffer value? (base on the internal Rds) Have any formula to share? 

(b) if load-switch solution change to use TI.TPS22990 solution, how to calculate the CT/slew-rate part relative design? (I think this one is independent, right?) 

Now, only have above two question to asking first, please help to clarify. 

Best Regards 

By Neil Chen

  • +1
    TI__Mastermind 32781 points

    Hello Neil,

    1.Yes, you can do parallel operation of load switches.

    2.Each load switch has maximum current carrying capacity and take into account the change in RDSon for device to device. You can take the min and max value of RDSon from datasheet. The current distribution should not exceed the device current rating. Current flowing through the lowest RDSon device should be less than the device current rating.

    3.CT value you can calculate for single device and multiply with number of devices in parallel. That can be your common CT value.

    Thanks

    Amrit

  • 0 in reply to Amrit Jit
    Prodigy 40 points

    Hi Amrit, 

    Noted, this answer is very clarify to understand how to use load-switch implementation in parallel design, tks!

    Thanks

    Neil

  • 0 in reply to Neil Chen
    TI__Mastermind 32781 points

    Happy to help.

    Closing this thread.