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TPS2121: - Schematics Review

D4DJ
Prodigy 110 points
Part Number: TPS2121

Tool/software:

Hello TI Team,

We would like to get the below schematics reviewed for TPS2121. 

We have used two TPS2121RUXT in parallel to derive higher current rating.

Kindly review and let us know your comments ASAP.

Thanks!

  • 0
    TI__Mastermind 34935 points

    Hello,

    There are no issues with the individual schematics, however in general we don't recommend paralleling muxes. The main issue with paralleling devices is that Ron and timing characteristics may vary slightly from device to device which could cause some unexpected behavior such as one turning on before the other. If one were to turn on before the other then a single device would need to handle the load and could hit the current limit and TSD. This event could occur again during a switchover event.  

    You can use load switches with the PGOOD signal from your regulator to create a pmux. The link below (from the post you mentioned) explains more about power multiplexing with load switches and efuses, and i've also linked the product folders for both. We have numerous load switches that can operate at and above 6 A continuous output current. We also have an efuse TPS25957 that supports up to 5.5 A that can be set to pmux with the body diodes.

    Power Multiplexing Using Load Switches and eFuses (Rev. A)

    Load Switch Product Folder

    Efuse Product Folder

    Best Regards,
    Tim