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Low current limited load switch - adjustable current limit

Alex Dukhovny1
Prodigy 130 points
Other Parts Discussed in Thread: TPS22946, TPS22943, TPS2553

I've got the recommendation from DC/DC support ( Chris Glaser ) to post my question right here. I am looking for integrated current limited switch which is capable of limiting in 10mA to 100mA range (adjustable limit )@4.2VDC.

I can make a discrete version based on OP Amp, voltage reference and P-MOSFET but I am definitely prefer some integrated solution.

  • 0
    TI__Expert 5275 points

    Hi Alex,

     

    Do you need to be able to adjust the current limit over the whole range (10mA-100mA), and how much accuracy is needed?

    Also, are you needing to adjusting the current limit during operation?

     

    For that range, the TPS22946 might be a good option.  It has 3 selectable current limits: 155 mA, 70 mA, or 30 mA.

    There is also the TPS22943 which has a current limit ~65mA.

    Let me know if you think one of these will work.

     

    Kind Regards,

    Adam Hoover

    Load Switch Applications Engineer

  • 0 in reply to Adam Hoover
    Prodigy 130 points

    Adam,

    Thanks for the feedback.

    I''l need to switch the limit at least from low ~10mA to the high ~100mA during the operation( not necessarily  seamless switching if the inrush protection exists ). The TPS22946 might be a good compromise if  I'll be able to match the CL pin load for the "floating" condition with my MCU's IO

  • 0 in reply to Alex Dukhovny1
    TI__Expert 5275 points

    Alex,
     
    Since you actually need to switch between the two limits during operation, I think the TPS22946 would be your best option.  There are some switches such as TPS2553 which allow you to set the current limit using an external resistor (could use FET to switch resistances), but the lowest current limit is ~75mA.
     
    Let me know if there's some other way I can help!
     
     
    Best Regards,
    Adam

  • 0 in reply to Adam Hoover
    TI__Expert 5275 points

    Hi Alex,

     

    Have you been able to confirm the TPS22946 will work for your design?

     

    Best Regards,

    Adam

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  • 0 in reply to Adam Hoover
    Prodigy 130 points

    Hi Adam,

    I am working on the system level design right now, the actual HW is not ready yet, but the proposed TPS22946  limiter seems to me the best solution (price/performance/features) for our system . Thank you for help.

  • 0 in reply to Alex Dukhovny1
    TI__Expert 5275 points

    Alex,

     

    Thanks for the feedback!  Should you have any question or problems down the line, just let me know!

     

    Best,

    Adam