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LMR16006: /SHDN pin

Kuramochi Tadahiko
Guru 28715 points
Part Number: LMR16006


Hi,

It is mentioned follows on the datasheet.

"If the use of a higher voltage is desired due to system or other constraints, a 100 kΩ or larger resistor is recommended between the applied voltage and the SHDN pin to protect the device."

What do you mean "to protect the device"?

Can the device be broken without a 100 kΩ or larger resistor？

I have already seen follow thread.

e2e.ti.com/.../551591

Best Regards,

Kuramochi

  • 0
    TI__Expert 4365 points

    Hello Kuramochi-san,

    I think the previous thread only hints at the real question.

    The question: "Is there a diode junction that will forward bias if the  !SHDN input is elevated to a voltage that is higher than Vin?"

    The curve tracer reveals what the data sheet does not. There IS a diode junction that starts conducting if !SHDN rises above VIN by more than 1.5V.

    So the suggestion for the limiting resistor is to keep the diode current below a level that might damage the IC. So either a series resistor or a shunt protection diode or both.

    higher  

  • 0 in reply to Alan Martin
    Guru 28715 points

    Alan-san,

    Thank you for your support.

    I mention background.
    LMR16006 is broken on my customer's circuit.
    /SHDN pin is tied connected with VIN pin directly on their circuit.
    I would like to ask if the broken can be caused by above connecting(without 100kΩ).

    I think that /SHDN voltage isn't higher that VIN voltage if /SHDN pin is connected with /VIN.

    Best Regards,
    Kuramochi

  • 0 in reply to Kuramochi Tadahiko
    TI__Expert 4365 points

    On one hand I don't see how that can happen because there would be no voltage difference to cause this issue. However, in the text they recommend the 100k added resistor, so this recommendation should be obeyed.