Capacitor-less low drop-out (LDO) regulator, integrated circuit, and method
AssigneeMicrochip Technology Incorporated
InventorsRaghuveer Murukumpet, Kent Lawrence, Asif Iqbal
Life of this patent
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Abstract
An integrated circuit including a low drop out (LDO) regulator configured to implement transient response and loop stability in a capacitor-less configuration, including an error amplifier configured to receive a bandgap reference input; first and second pass elements configured to receive outputs from the error amplifier; first and second resistor feedback networks, the first resistor network configured to provide a feedback output as an input to the error amplifier; an overshoot protection circuit; and an output connected to the pass transistors; wherein the capacitor-less low dropout (LDO) regulator is operable without an output capacitor.
Claims21
A low drop out regulator, comprising:
- an error amplifier configured to receive a bandgap reference input;
- first and second pass transistors configured to receive an output from the error amplifier;
- a first resistor feedback network, the first resistor feedback network configured to provide a feedback output as an input to the error amplifier;
- and
- an overshoot protection circuit, connected to and between an output of the low drop out regulator and ground, configured to control the output of the low drop out regulator based on the output of the error amplifier, the overshoot protection circuit separate from the first and second pass transistors;
- wherein:
- the output of the low drop out regulator is connected to the pass transistors, the output of the low drop out regulator configured to receive output values from the pass transistors;
- and
- the low drop out regulator is configured to control undershoot or voltage drop of the output of the low drop out regulator during incremental current load without an internal or external output capacitor.
An integrated circuit including a low drop out regulator configured to implement transient response and loop stability in a configuration, comprising:
- an error amplifier configured to receive a bandgap reference input;
- first and second pass elements configured to receive an output from the error amplifier;
- a first resistor feedback network, the first resistor feedback network configured to provide a feedback output as an input to the error amplifier;
- and
- an overshoot protection circuit, connected to and between an output of the low drop out regulator and ground, configured to control the output of the low drop out regulator based on the output of the error amplifier, the overshoot protection circuit separate from the first and second pass elements;
- wherein:
- the output of the low drop out regulator is connected to the first and second pass elements, the output of the low drop out regulator configured to receive output values from the pass elements;
- and
- the integrated circuit is configured to control undershoot or voltage drop of the output of the low drop out regulator during incremental current load without an internal or external output capacitor.
A method for providing a low drop out regulator configured to implement transient response and loop stability, comprising:
- providing an error amplifier configured to receive a bandgap reference input;
- providing first and second pass elements configured to receive an output from the error amplifier;
- providing a first resistor feedback network, the first resistor feedback network configured to provide a feedback output as an input to the error amplifier;
- and
- providing an overshoot protection circuit, connected to and between an output of the low drop out regulator and ground, configured to control the output of the low drop out regulator based on the output of the error amplifier, the overshoot protection circuit separate from the first and second pass elements;
- wherein:
- the output of the low drop out regulator is connected to the pass elements and the output of the low drop out regulator is receiving output values from the pass elements;
- and
- the low drop out regulator controls undershoot or voltage drop of the output of the low drop out regulator during incremental current load without an internal or external output capacitor.
Dependencies are inferred from the claim text.