Low-dropout voltage regulator circuit

A low-dropout voltage regulator circuit, comprising:

• an input node configured to receive an input voltage;
• an output node configured to produce a regulated output voltage;
• a pass device arranged between said input node and said output node and configured to receive a control signal from a control node, wherein a conductivity of the pass device is controlled by the control signal;
• an error amplifier configured to produce said control signal as a function of a difference between said regulated output voltage and a reference voltage;
• a cascode stage comprising a first current generator configured to source a compensation current to said control node, a cascode device having a conductive channel arranged between said control node and a compensation node, and a second current generator configured to sink said compensation current from said compensation node;
• a compensation capacitor arranged between said output node and said compensation node;
• a current sensing circuit configured to sense a load current flowing through said pass device and source to a first feedback node a feedback current that is proportional to said load current;
• a current mirror circuit comprising:
• an input branch formed by a conductive path arranged between said first feedback node and ground and configured to receive said feedback current;
• a high-pass filter coupled between a control terminal of said input branch and a second feedback node;
• a first output branch coupled to said second feedback node, said first output branch configured to sink a first additional compensation current from said compensation node, said first additional compensation current being proportional to said feedback current;
• and
• a second output branch coupled to said second feedback node, said second output branch configured to source a second additional compensation current to said control node, said second additional compensation current being equal to said first additional compensation current.

A low-dropout voltage regulator circuit, comprising:

• an input node configured to receive an input voltage;
• an output node configured to produce a regulated output voltage;
• a pass device arranged between said input node and said output node and configured to receive a control signal from a control node, wherein a conductivity of the pass device is controlled by the control signal;
• an error amplifier configured to produce said control signal as a function of a difference between said regulated output voltage and a reference voltage;
• a cascode stage comprising a first current generator configured to source a compensation current to said control node, a cascode device having a conductive channel arranged between said control node and a compensation node, and a second current generator configured to sink said compensation current from said compensation node;
• a compensation capacitor arranged between said output node and said compensation node;
• a first current sensing circuit configured to sense a load current flowing through said pass device and source to a first feedback node a first feedback current that is proportional to said load current;
• a first current mirror circuit comprising:
• a first input branch formed by a conductive path arranged between said first feedback node and ground and configured to receive said first feedback current;
• a low-pass filter coupled between a control terminal of said first input branch and a second feedback node;
• a first output branch coupled to said second feedback node, said first output branch configured to sink a first additional compensation current from said compensation node, said first additional compensation current being proportional to said feedback current;
• a second output branch of said current mirror circuit coupled to said second feedback node, said second output branch configured to source a second additional compensation current to said control node, said second additional compensation current being equal to said first additional compensation current;
• and
• a third output branch of said current mirror circuit coupled to said second feedback node, said third output branch configured to sink an additional bias current from said error amplifier, said additional bias current being proportional to said feedback current;
• a second current sensing circuit configured to sense the load current flowing through said pass device and source to a third feedback node a second feedback current that is proportional to said load current;
• a second current mirror circuit comprising:
• a second input branch formed by a conductive path arranged between said third feedback node and ground and configured to receive said second feedback current;
• a high-pass filter coupled between a control terminal of said second input branch and a fourth feedback node;
• a fourth output branch coupled to said fourth feedback node, said fourth output branch configured to sink a third additional compensation current from said compensation node, said third additional compensation current being proportional to said further feedback current;
• and
• a fifth output branch coupled to said fourth feedback node, said fifth output branch configured to source a fourth additional compensation current to said control node, said fourth additional compensation current being equal to said third additional compensation current.