Can I apply 3.3V at VCC and get 5V output on the ISOW78xx device?
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The ISOW78xx devices currently do not support boost operation. They currently support 5V->5V, 5V->3.3V and 3.3V->3.3V configurations. We do not guarantee functionality when the device is configured in a 3.3V->5V configuration. Please refer to Section 9.4 of the ISOW78xx datasheet, and this E2E thread for more details.
ISOW77xx is a new, upgraded, second generation family of devices with integrated DC-DC converters. View the ISOW7741 datasheet to learn more.