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LMZM23600: Behavior in bypassed operation

Nicolai_
Prodigy 10 points
Part Number: LMZM23600

Hello,

I would like to use the LMZM23600 in a board layout where the 3.3 V supply may be

- generated by the LMZM (given e.g. 8 V via an external pin)

- given via another external pin (in this case the VIN pin of the LMZM will be unpowered).

So in my layout the board has a 3-pin connector with VIN, 3.3VIN and GND, of which VIN and 3.3VIN will never both be driven in any setup.

Is it possible to simply include the LMZM23600 in this design or do I have to apply e.g. a diode?

Regards,

Nicolai

  • 0
    TI__Guru 50120 points

    Hi Nicolai,

    Sounds like you want to generate the 3.3V from either powering on the LMZM23600 (8Vin to 3Vout conversion) or externally applying 3.3V on the output. If that is the case, I'd recommend putting a blocking diode at the output of the LMZM23600 since applying a 3.3V at the output may create a reverse current path that can damage the internal MOSFET of the device. 

    Regards,

    Jimmy