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TPS54316: Enable/SS Function Question

Kyle Micovsky
Prodigy 10 points
Part Number: TPS54316
Other Parts Discussed in Thread: TPS62810M

I am designing a 3.3V regulator solution with the TPS54316MPWPREP.  Our FPGA will control the enable signal on the regulator so that it becomes enabled only when the ambient temperature read is above -40C.  Is this solution as simple as having a pull-down resistor on the Enable line and driving a logic high to it when the enable conditions are met?  How does this scenario affect having an external cap for the soft start?

  • +1
    TI__Expert 7605 points

    Hi Kyle,

    Thanks for your question.

    Please refer to the below block diagram.

    You should drive the SS/ENA to GND as long as the device is disabled.

    In this way you will short the 5uA current to GND and the pin will not reach the 1.2V threshold.

    When you want to enable the device, you should leave the SS/ENA pin floating (high impedance), allowing the internal reference current to charge the SS capacitor.

    You can refer to section 7.3.2 of the datasheet for further details.

    As a general comment, this is a very old device and I won't recommend it for new applications.

    If you share your requirements, I can suggest an alternative device.

    Thanks,

    Stefano

  • 0 in reply to Stefano Panaro
    Prodigy 10 points

    Thanks for the reply Stefano.  I selected this device due to it being in stock (which is rare nowadays) and it meeting our main requirements:

    - Operating Range: -55C to >100C

    - Capable of at least 3A (at 3.3V output)

    - Accepting of a 5V input supply (our system input voltage is 5V +/- 10%)

    - Has an Enable pin to be able to control operation of device

    - Smaller size / minimum supporting components

    - Currently available at vendors

    Thanks,

    -Kyle

  • 0 in reply to Kyle Micovsky
    TI__Expert 7605 points

    Hi Kyle,

    Got it, thanks.

    Usually our devices are specified up to -40C.

    If you need to go up to -55C, you should refer to the extended temperature devices, as TPS62810M.

    Please refer to your vendors regarding availability.

    Thanks,

    Stefano

  • 0 in reply to Stefano Panaro
    Prodigy 10 points

    Do you know if this part is going EOL soon?  My hand is somewhat forced to use this part since there isn't anything else in stock that meets requirements.

    -Kyle

  • 0 in reply to Kyle Micovsky
    TI__Expert 7605 points

    Hi Kyle,

    The component is marked as 'active', therefore there should not be any plans to go EOL at this moment.

    Thanks,

    Stefano