Hi,
you say "I am trying to design a digital LDO"
So you should know for what you want to design the LDO.
What input conditions what output conditions....
Also you should know what technology you want to build the design.
(You posted in the "Analog Circuit Design" section of the forum, but then you say "digital" = "not analog". And I assume this rather is "IC design" than "Analog Circuit Design")
--> Every design should start with requirements and specifications.
Tell the whole story.
Klaus