question of UVLO feature in ADN8831

In datasheet of ADN8831,

1. The "Undervoltage Lockout" is typical 2.2V with 2.6V as maxim, there is a note about the UVLO: "The ADN8831 does not work when the supply voltage is less than UVLO." So the 1st question is:

1) if Vdd<UVLO

what is the (PWM)output of ADN8831? is it un-determined or just lock out to default value? what is the default value(low or high?);

2. The power supply range is typical 3V with 5.5V as maxim, so the 2nd question is:

2). if UVLO<Vdd<3V

what is the PWM output of ADN8831? un-garanteed?

As I know, in most gate drivers, the part will output default value(say low) if the VDD is under UVLO, but not "does not work", please help clarify. Thanks.