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LMR14050: What is the behavior of LMR14050 when reverse biased?

jon watte
Prodigy 30 points
Part Number: LMR14050

The data sheet doesn't specify what LMR14050 does when reverse biased -- i e, 5V on the VOut, and disconnected/floating on the VIn.

My guess would be that it behaves like a MOSFET body diode -- is this a safe assumption? If so, what is the Vf drop of that diode?

  • 0
    TI__Guru 73305 points

    There is a diode from VIN to SW, cathode on VIN.  This is actually a parasitic device and not just a "diode".

    That means that it should not be forward biased under any conditions.  Since this can turn on a parasitic

    device that may cause unexpected behavior and/or damage the device.  Unfortunately, this behavior is not normally

    characterized, so we can not say what level of current may be a problem; we can only recommend that this diode should not

    be forward biased in a power down situation.