Can the enable pin voltage (5V) exceed the input supply pin voltage (1.8V) ?
For this application, the bias pin is left unconnected.
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The device wouldn't be permanently damaged and could be functional with Enable voltage = 5V, and Vin = 1.8V. But in order for the device to perform reliably in the long term and meet the datasheet Specs, it is best if the Recommended operating conditions are satisfied and if the Enable Pin voltage does not exceed the input pin voltage. Thanks!