Difference amplifier for regulating voltage

A low dropout voltage regulation circuit comprising:

• an input comparison stage having an inverting input, a non-inverting input, and an output, said inverting input coupled to an output voltage node;
• a bandgap reference voltage circuit coupled to said non-inverting input;
• a low dropout output stage coupled to an input voltage node and the output voltage node;
• and
• a gain stage comprising a buffer device and a drive circuit, said buffer device coupled to said output of said input stage and said drive circuit, said drive circuit coupled to said output stage, said drive circuit comprising
• a first transistor coupled to said output stage;
• a base current translation circuit;
• and
• a current divide circuit coupled to the first transistor and to said base current translation circuit, wherein said current divide circuit is operable to deliver a portion of a first current of said first transistor to said base current translation circuit;
• and
• wherein said base current translation circuit is operable to deliver to the base of said first transistor a second current that is greater in magnitude than a base current of the first transistor;
• wherein said buffer device is operable to provide isolation between said input stage and said drive circuit.

A voltage regulation circuit comprising:

• an input comparison stage comprising a first pnp transistor and a second pnp transistor, said first pnp transistor coupled to an output voltage node;
• a bandgap reference voltage circuit coupled to said second pnp transistor;
• an output stage coupled to an input voltage node and the output voltage node;
• and
• a gain stage comprising:
• a third pnp transistor coupled to said output of said input stage;
• a drive transistor coupled to said third pnp transistor and said output stage;
• mirror transistors coupled to said drive transistor;
• and
• a translation circuit coupled to the mirror transistors;
• wherein the mirror transistors are operable to deliver a portion of a first current of said drive transistor to said translation circuit;
• and
• wherein said translation circuit is operable to deliver to the base of said drive transistor a second current that is greater in magnitude than a base current of said drive transistor.