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ISOW7744: device pin connection check

Jim Tsai
Expert 4470 points
Part Number: ISOW7744

Hi,

Some questions would like to check with you.

1, Could pin8 EN/FLT floating?

2. if Pin8 high, when DC-DC power converted is enable, the output will be Visoout, right?

3. If Pin8 low, could no supply for VDD and supply VIO by external source?

  • 0
    TI__Guru 55815 points

    Hi Jim,

    Thanks for reaching out. Please see my inputs below, thanks.

    1. EN/FLT pin shouldn't be left floating. It should be connected to VIO through a pull-up resistor to enable the device.
    2. That is correct, VDD is the input of DC/DC and VISOOUT is the output.
    3. No, if EN/FLT is LOW then the device will be disabled and powering VIO external doesn't allow device operation. This pin has to be made HIGH to make the device work.


    Regards,
    Koteshwar Rao