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LMR36506-Q1: Applying a voltage to the output and sync without any input voltage

Philipp Wiesner1
Prodigy 10 points
Part Number: LMR36506-Q1

Hi,

Is it save to apply a voltage to the output pins (SW, VOUT/BIAS/FB) of the LMR36506-Q1 and also apply a clock signal to the SYNC pin, while there is no voltage applied to VIN?

Current flow from the output (SW) to the input (VIN) of the device can not be tolerated in this application. (Current flow into SYNC is neither.)

Thank you very much

  • 0
    TI__Genius 10655 points

    Hello Philipp,

    If the switch node voltage Vsw is greater than VIN plus a diode drop, then a current path exists from SW through the body diode of the high side MOSFET (HSFET) to the VIN pin.

    Depending on the application there are ways of blocking this current flow such as providing a diode between the load and the device output.

    Do you have a schematic of your intended application?

    The following article has more information:

    https://www.ti.com/lit/an/slyt689/slyt689.pdf

    Regards,

    Harrison Overturf