Power  level of HMC68x

My customer has questions about the power of HMC68x series(ex:HMC686, HMC687.....).

  1. In the datasheet, there are the graphics which VCC1,2,3 = 3.3V is used for low power consumption as shown below.

      What is the effective power range of HMC68x ?

 2. Should the customer wants, is it possible to use VCC1,2,3 = 4.5V ?

Thanks.