This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS2660: SHDN Pin Of TPS26601

Part Number: TPS2660

Hello,

I am using TPS26601 Industrial eFuse in one of our design. I am bit confused about the configuration of SHDN# Pin (Pin 14) . In the functional block diagram in Page 17 of Datasheet, it is clear that the pin is pulled up to a voltage Avdd through a resistor. But couldn't see the value of pull up resistor & the voltage of Avdd. Also in the specification at Page 5 the absolute maximum voltage of SHDN pin is 60 V and the recommended voltage is maximum 4V. What kind of clamping is used there ? ( Voltage ratings ? )

Can someone give an input on these ? 

Thanks in advance.

Regards

Sreejith

4 Replies

  • Hi Sreejith,

    SHDNb is pulled to 3.15V with 667Kohm internal pullup.

    Recommended operating voltage is 4V during normal operating condition. But this device supports reverse VIN polarity protection from field mis-wiring up to -60V VIN. When a input voltage polarity is reversed, SHDNb can see >4V with reference to RTN. This is why maximum operating voltage is as high as 60V. Let me know if you require more inputs on the input reverse polarity condition, I can help to explain in more detail.

    Regards,
    Kari.
  • In reply to Karikalan Selvaraj:

    Hi Kari,

    Thank you very much for the reply.

    This cleared my doubts. 

    Regards

    Sreejith

  • In reply to Karikalan Selvaraj:

    Hi Kari,

    My application does not require using the shutdown function. Since SHDN# is pulled up to AVdd, is it OK to leave it unconnected for always-on operation?

    Thanks,
    Narek
  • In reply to Narek:

    Hi Narek,

    It is OK to leave SHDNb pin unconnected if you are not using the Shutdown functionality. But please note that the internal pullup is very week and need to consider external pullup if you require rugged operation.

    Regards,
    Kari.

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.