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TPS25942A Minimum Current Limit

Jason Petras
Intellectual 650 points
Other Parts Discussed in Thread: TPS25942A, LM5069, LP2951, LM5060, TPS25921A, TPS24750, TPS2660

Hi all, 

I would like to use the TPS25942A with a lower current limit, say 200mA. Can you please tell me if this possible/advisable and what spec trade-offs result in doing so? And to complete the lunacy, how low can you practically go?  

Thank you!

Jason 

  • 0
    TI__Genius 12621 points

    Hi Jason,

    The TPS25942A is an eFuse device which now belongs under the "Load Switches" forum. I will move the thread accordingly.

    In the meantime, you may be interested in this E2E thread which discusses the LM5069 being used with a low adjustable current limit (but is a "large" solution). As well as how the LP2951 can be used for a 150mA limit.



    Thanks!
    Alex

  • 0 in reply to Alex Triano
    Intellectual 650 points

    Hi Alex, 

    First, thank you for moving the article!

    Second, thanks for the LM5069 and LP2951 recommendations. I have been eye-balling the LM5069 this morning. It looks like a good runner up if I get stuck. I already have the TPS25942A elsewhere in the design. It would be great to use a couple of more instead of something new.

    Jason 

  • 0
    TI__Guru** 105361 points

    Hi Jason,

    The lower current limit possibility for TPS25942A device is 450mA. This can be set through current limit resister R(ILIM) "OPEN". 

    Can you please provide details of your end application and its requirement to suggest the suitable part.

    Thanks,

    Rakesh

  • 0 in reply to Rakesh
    Intellectual 650 points

    Hi Rakesh, 

    Thank you very much for the input. Bummer about the minimum. I was hoping for 300mA or a bit less. This is a very cool part you have. 

    My application is pretty straight forward. I have a number off-board items that I need to power on and off. I would like to have a good suite of protections and monitoring: power good, current/power limits, reverse current protection, small footprint, 5V and 12V output, at least I-temp (preferably -40 to 105C). A few require a few amps, some others require 200-300mA. 

    I am thinking I will need a small mix of parts: LM5060/9 for my 12V, low current outputs, or perhaps an LDO with some protections; a 5V output switch (perhaps from the USB family if it is rugged enough). Then the 25942A for the higher current 12V.

    I would appreciate your $0.02.

    Thanks!

    Jason

  • 0 in reply to Jason Petras
    TI__Guru** 105361 points
    Hi Jason,

    Understood your requirement.
    For lower currents TPS25921A can also be considered. However, the device TPS25921A does not have reverse blocking function. Please check and revert back for any information.

    Thanks,
    Rakesh
  • 0 in reply to Rakesh
    Intellectual 650 points

    Hi Rakesh, 

    Thanks for the suggestions. These are great. After a lot of back and forth, I decided to go with the LM5069. The TPS25921A has a lower current limit, but not by a bunch. 

    Although I have just designed the LM5069 in, I came across the TPS24750. This would have been a good solution too. The external sense resistor seems to help still.

    Thanks!

    Jason

  • 0 in reply to Jason Petras
    TI__Guru** 105361 points
    Hi Jason,

    Yes, TPS24750 is the right candidate if your are looking for integrated FET solution with better current control accuracy. TPS24750 device has current limit accuracy in the range of ±7% over -40°C to 125°C.

    We will be releasing a new device TPS2660 in the next month, where the current limit can be programmed down till 100mA.
    Please refer the preliminary datasheet @ www.ti.com/.../tps2660.pdf

    Best Regards,
    Rakesh
  • 0 in reply to Rakesh
    Intellectual 650 points

    The TPS2660x is great! This would have covered my 24V switch too. ... next rev... humm.....

    1000 Brownie Points to Rakesh and the TI team.

    Thank you