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LM5000: /SHDN pin's internal circuit.

Motoyasu Hattori
Genius 9985 points
Part Number: LM5000

Hi,

Related /SHDN, He wants to control LM5000-3 device using /SHDN pin from MCU.  Under power-up condition, he wants Low on /SHDN pin, and output high from MCU to wake-up LM5000-3.

Does /SHDN pin have pull-up resistor internally?  If yes, please let me know the resistor value.

The reason why we need it is to decide the pull-down register value on his actual board.

Thank and best regards,
M.HATTORI.

  • 0
    TI__Guru 62995 points

    Hello Motoyasu,

    The voltage on this pin needs to be below 0.3V. If the pin is pulled to GND and the input voltage is at 12V, -2uA are flowing into this pin maximum, so a resistance of 150 kohm should keep this pin below 0.3V. to be on the save side, I recommend to use a resistor below 100 kohm and if you do not mind the current consumption 10 kohm is a nice value there.