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Smart Load Switch for 12V, 5A max and 5V, 3A max loads

Juan Medrano83
Intellectual 535 points
Other Parts Discussed in Thread: TPS25910, TPS2592BA

Hi everyone at TI and forum users,

I have been looking with many semiconductor manufacturers for a "smart" load switch(es) that can handle the following requirements:

First One:

VIN: 12V nominal  (probably more like 8V < Vin < 17V)

Output current: 5A

Short Circuit Protection:  something in the range of 20A - 40A

Overvoltage protection (voltage clamp):  45V or around

Overtemperature protection: when the device reaches certain temperature (for example 140°C) it can shutdown and restart automatically after the temperature has drop to certain level.

ESD protection: Human body model, 

CMOS, TTL compatible (controllable from a 5V MCU)

Second One:

VIN: 5V nominal  (probably more like 4.75V < Vin < 5.25V)

Output current: 3A

Short Circuit Protection:  something in the range of 8A - 20A

Overvoltage protection (voltage clamp):  45V or around

Overtemperature protection: when the device reaches certain temperature (for example 140°C) it can shutdown and restart automatically after the temperature has drop to certain level.

ESD protection: Human body model, 

CMOS, TTL compatible (controllable from a 5V MCU)

I am looking for output protection devices that can handle the voltage and current requirements and that have the protections stated (short-circuit, over-voltage, overtemperature, ESD). I am open to any suggestions since I have not been able to find anything suitable in the TI product range, but maybe my search has not been good.

If any experts from TI have any recommendation that match or more or less match the requirements I am willing to hear them.

Thanks!

  • 0
    TI__Genius 15740 points

    Hi Juan,

    I have notified the appropriate engineer and he should get back to you soon.

    Thanks,

    Alek Kaknevicius

  • 0 in reply to Aleksandras_Kaknevicius
    Intellectual 535 points

    Thank you so much Alek! I have posted other questions regarding the TPS25910 in this forum, I would greatly appreciate if you can inform the appropriate engineer supporting this device too.

    Have a great day. 

  • 0
    TI__Intellectual 2980 points
    Juan,

    We have a device TPS25942x , which meets your requirements as

    First One:
    IN: 12V nominal (probably more like 8V < Vin < 17V)
    Output current: 5A
    Now , when ever short circuit happens at the output of the TPS25942x the max current is allowed is about 8A.
    One question is there any requirements that when ever output is short, the SC current should be 8A to 20A and why?

    if the over input voltage (i.e.45) is for short duration, a 18V, TVS at the input can be used to suppress such over volatge.
    and if the 45V can appear for long time or continuously , some other means should be adapted to limit the input voltage to TPS25942 less than 20V

    Second One:
    Again, TPS25942x , will meet your requirements

    VIN: 5V nominal (probably more like 4.75V < Vin < 5.25V)
    Output current: 3A
    Rest of the the comments are same as in first case.


    I believe that TPS25942x should meet your requirements.

    Please let me know if you have further questions.

    Regards
    Dinesh
  • 0 in reply to Dinesh Kumar6
    Intellectual 535 points

    Hi Dinesh,

    Thanks for your reply and recommendation. I had to do a selection before your reply, and following is what came out:

    For the first case:

    I previously checked this device and it suited the application, but I also found the TPS25910 with more or less similar characteristics at a lower price, that also suited the application (although I have some doubts posted in this forum).

    The TPS25942 of course is more expensive because has much more functionality and information to provide, but part of that extra functionality is not of my interest.

    Do you think the TPS25910 is a device capable of handling the requirements? Based on the requirements, both of them would need the TVS at the output to suppress high voltage transients, so they are likely the same in relevant characteristics/limitations, but the TPS25910 at a lower price.

    For the second case:

    I actually found the TPS2592BA with similar protection charateristics as the TPS25942 and TPS25910, but designed for 5V rails. As well as those, it would also need a TVS at the output to suppress voltage transients. 

    What is your opinion about using the TPS25910 for the 12V,5A voltage rail, and the TPS2592BA for the 5V,3A? As you might already know, I am looking for the lowest price device that can meet the requirements.

    Regarding your question about the Short Circuit current, I do not need it to be more than 8A in any sense. 

    Thank you for your comments back.

  • 0 in reply to Juan Medrano83
    TI__Intellectual 2980 points
    Hello Juan,
    It is perfect to use TPS25910 for the 12V,5A voltage rail, and the TPS2592BA for the 5V,3A application.
    I wanna suggest you one device which meets you boards cases. this way it will be more economical to you.
    The device will TPS259241, this will be RTM early next month.
    We are just getting ready with this.

    Best Regards
    Dinesh
  • 0 in reply to Dinesh Kumar6
    Intellectual 535 points

    Ok, thanks. Is there any official datasheet for the TPS259241 available? Because of the timeframe, we will consider the device for future revisions.

    Thanks for your suggestions.

  • 0 in reply to Juan Medrano83
    TI__Intellectual 2980 points

    Hello Juan,

     You can see the preview of this data sheet at 

    Best Regards

    Dinesh

  • 0
    TI__Genius 15740 points

    Hi Juan,

    I just wanted to let you know that the TPS25924 has been released.  We also have an upcoming device which you may be interested in for this application.  For more information, please contact me directly at a-kaknevicius@ti.com.

    Thanks,

    Alek Kaknevicius

  • 0 in reply to Aleksandras_Kaknevicius
    Intellectual 535 points

    Hi Alek,

    I just wrote you an email.

    Thanks,

  • 0 in reply to Juan Medrano83
    TI__Expert 3460 points
    Hi Juan,

    Could you please cc me on that email as well. Thanks,

    Harry Kennedy
  • 0 in reply to Harry Kennedy1
    Intellectual 535 points
    For sure, what's your email?
  • 0 in reply to Juan Medrano83
    TI__Expert 3460 points
    My email is H-kennedy@ti.com