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LMR14050: LMR14050 EN pin application?

Chen Bogey8
Mastermind 9990 points
Part Number: LMR14050

Hi Sir 

we find LMR14050 EN pin can floating. 

my customer question is if we want use MCU(3.3V) GPIO pin to control LMR14050 EN pin, how to connect?

And what is LMR14050 en pin voltage level when floating?

                                                 Bogey

  • 0
    TI__Mastermind 34875 points

    Hi,

    Normally you can connect GPIO to EN pin directly for enable control.

    The only concern is status(or the output resistor or voltage level) of GPIO during MCU shutdown and startup. EN pin has internal pull high current(1uA typical), if GPIO is high Z mode(>1.5M ohm) during shutdown  or startup, then EN pin will still see  voltage 1.5V over Ven-th and enable the chip. so you may add 10K resistor on EN pin to GND.