US 2014/0191739 A1 · LOW DROP-OUT REGULATOR

Abstract

Exemplary embodiments disclose a low drop-out regulator including an error amplification unit which includes a zero compensation circuit configured to compensate a plurality of poles which are generated by an output terminal and a buffer, the error amplification unit is configured to generate a first comparison signal in response to a reference voltage and a feedback voltage, the buffer is configured to generate a second comparison signal in response to the first comparison signal and an input voltage, a pass unit configured to provide an output voltage and a load current to the output terminal in response to the second comparison signal and the input voltage, and a feedback unit configured to provide the feedback voltage to the error amplification unit in response to the output voltage. A driving current of the buffer is independently adjusted with respect to the load current.

Claims20

Dependent claims

A low drop-out regulator comprising:

an error amplification unit which comprises a zero compensation circuit configured to compensate a plurality of poles which are generated by an output terminal and a buffer, the error amplification unit is configured to generate a first comparison signal in response to a reference voltage and a feedback voltage;
the buffer is configured to generate a second comparison signal in response to the first comparison signal and an input voltage;
a pass unit configured to provide an output voltage and a load current to the output terminal in response to the second comparison signal and the input voltage;
and
a feedback unit configured to provide the feedback voltage to the error amplification unit in response to the output voltage,
wherein a driving current of the buffer is independently adjusted with respect to the load current.

3 more elements

Dependencies are inferred from the claim text.

Low drop-out regulator

Life of this patent

Low drop-out regulator

Life of this patent

Abstract

Claims20