LTM4622 and LTM4644 Vin min when Vout = 5V

Dear Sirs,

We'll use two LTM4622 or one LTM4644 to generate four different voltage.

One of this voltage is 5V. What's the minimun Vin Value to have Vout = 5V?

Is there a equation to calculate this Vin minimum value?

Best Regards.