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TPS22953: Auto switching Power Mux

Mark Guastaferro
Genius 11095 points
Part Number: TPS22953
Other Parts Discussed in Thread: TPS2115A, , TPS22910A, TPS25942A

I am trying to find a solution for an auto-switching power mux that operates similar to the TPS2115A but with lower ON resistance. Using two TPS22953 would be attractive, but is it possible to arrange these to minimize voltage droop when switching? Load capacitance is about 35 uF total. I need a solution that is closer to a make-before-break. 

Both voltage sources are nominally the same, around 4V. When the main voltage drops, we need to switch in the back-up voltage with minimal output voltage drop. I don't think the make-before-break application shown in 10.1.7 of the data sheet with the TPS22910A will not work if the nominal input voltages are the same. Plus On resistance of TPS22910A is much higher. 

Two TPS25942A eFuse devices could probably do this as shown in App Note slva811.  The ON resistance of these is higher than I hoped and the solution looks to be much more expensive.

Is there any other option?  

  • 0
    TI__Genius 15710 points

    Hi Mark,

    Thanks for reaching out, and thank you for reading our power muxing app note to get you started with this design. It seems like you are familiar with most of our current solutions, but I will go ahead and reach out to you directly (email) for some additional information to help provide the best solution here.

    Thanks,

    Alek Kaknevicius