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TPS25200: TPS25200 Reverse current

Tom SP
Prodigy 50 points
Part Number: TPS25200
Other Parts Discussed in Thread: TPS25947, TPS2552, TPS2661, TPS2640, TPS2662

Tool/software:

Hi,

We are using the TPS25200 eFuse with reverse current blocking in our product design. However, there are instances when the current may flow in the reverse direction, from the output to the input, while the TPS25200 is powered off. This can happen if the user mistakenly connects to the output of the TPS25200 instead of the input.

In such cases, we have observed that the TPS25200 overheats and fails.

Could you recommend alternative components/parts/products that would allow current to flow from the output to the input while protecting the TPS25200? Adding a Schottky diode in series with the output is not a viable option due to the voltage drop across the diode. Our maximum output voltage is 5.5V, and the output current is 150mA.

Thank you.

  • 0
    Prodigy 50 points

    We noticed a small typo in our initial post. We intended to seek a a solution that would disallow ( and not allow) current from flowing from the output to the input while protecting the TPS25200.

    Tom

  • 0 in reply to Tom SP
    TI__Mastermind 38985 points

    Hi Tom,

    eFuse with back-to-back FET should be good for this application. Are you using current limiting or current sensing feature of the eFuse? If you are not using that feature, then eFuse like TPS25947 is good fit as it provides always on reverse blocking.

    Also are you open to new device suggestion or want to add extra components to protect the device. I think some load switches will also fit in this application. I will have to look into them for exact recommendation. 

    App note with more information on back-to-back FET configuration: Achieve Bidirectional Control and Protection Through Back-to-Back Connected eFus

    Best Regards,
    Arush

  • 0 in reply to Arush Gupta
    Prodigy 50 points

    Hi Arush,

    In our application design, we are using an eFuse for overcurrent limiting. Due to the specific requirements of the application, which limits the current to a maximum of 120mA, the number of different components has been reduced to just a few.

    We have considered using the TPS25200, TPS2552, or TPS26625 for this purpose. However, there is a chance that we may have overlooked other TI components that might be suitable.

    Our design parameters are as follows:

    Vin_Min = 4.4V
    Vin_Max = 5.5V
    Iout_Max = 120mA

    We have ruled out the TPS26625 because, during an overload (overcurrent), the eFuse cuts the current to zero and then retries automatically. This behavior does not suit our application, which requires limiting the current without cutting it to zero.

    It is not an issue to add additional components to protect the TPS25200. Which components would you recommend?

    Regards,
    Tom

  • 0 in reply to Tom SP
    TI__Mastermind 38985 points

    Hi Tom,

    I think eFuse like TPS2640, TPS2661, TPS2661 should work in this application. Let me add my colleague who understands these parts better than me. 

    Tom SP said:
    We have ruled out the TPS26625 because, during an overload (overcurrent), the eFuse cuts the current to zero and then retries automatically. This behavior does not suit our application, which requires limiting the current without cutting it to zero.

    TPS2662 should limit the current instead of performing circuit breaker response.

    Best Regards,
    Arush