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TPS7H4001-SP: TPS7H4001-SP Enable and UVLO levels

Part Number: TPS7H4001-SP

Hi, how are you?


I have a question about the TPS7H4001-SP buck converter. In the first image, where you can see case 1, I use R1 and R2 to adjust the input voltage UVLO, and I need to control the enable with a single signal from an external chip, the ISL70321SEH. The chip has an open-drain output, and I have a pull-up resistor (Rpllup) to pull up the Enable1 signal. Enable1 will be the enable signal for the TPS7H4001.

The voltages of the single signal are 0V and 5V.

The questions here are:

1_Can I connect Enable1 to Enable?
2_Will the configured chip work properly with the calculated UVLO levels, using the equations and the external chip enable signal?

Here I have the case 2 where I don´t have R1 and R2 to control the UVLO levels.


the questions here are:


3_ Can I connect Enable 1 to Enable?
4_ What are the UVLO levels here?
5_ Is the enable threshold the same for case 1 and case 2?

Thanks for taking the time to read me.

I am waiting for your answers.

Best regards,

Facundo Cosentino

INVAP S.E

  • Hello Facundo,

    Answers to your questions:
    1_Can I connect Enable1 to Enable?
    Connecting it will not damage the part


    2_Will the configured chip work properly with the calculated UVLO levels, using the equations and the external chip enable signal?
    The UVLO will only work if the part in front isn't running.
    UVLO is calculated for the situation with only R1 and R2 with no external connection

    3_ Can I connect Enable 1 to Enable?
    I suggest an external resistor to set the EN pin to make sure it does not float.
    If ENABLE1 will cause ENABLE to float, this is not desireable

    4_ What are the UVLO levels here?
    ~1.11 V to 1.14 V with some offset due to RPULLUP

    5_ Is the enable threshold the same for case 1 and case 2?
    The threshold is the same

    Thanks,
    Daniel