MP5403 Power Failure Indicator

In our design we would not use the Power Failure Indicator of the MP5403. What we have to do with the Pins PFL, PFL_ADJ and C_DELAY. Could these pins be left open?

Furthermore, we didn’t need the PG1, PG2 and PG3. Could these pins also be left open or is an external pull-up necessary?

Many thanks.