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Why PMOS used in LDO more than NMOS?

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ldo nmos output

I think using Pmos or Nmos depends on the output voltage one is trying to generate .Since the Nmos pass transistor one can go for a dominant pole compensation rather then going for LDO compensation taking ESR into effect .
In low supplies one would go for PMOS for effiency/low drop out .
 

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