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US 8,710,813 B2Granted
Low drop-out regulator providing constant current and maximum voltage limit
AssigneeSystem General Corp.
InventorsTa-Yung Yang, Jenn-Yu Lin
Life of this patent
Estimating the term…
Abstract
A low drop-out regulator is disclosed. An unregulated DC input terminal receives an input voltage. A pass circuit is coupled between the unregulated DC input terminal and a regulated DC output terminal for supplying a power to the regulated DC output terminal. An amplifying circuit controls the pass circuit for providing a constant voltage or/and a constant current in response to an output voltage or/and an output current.
Claims24
A low drop-out regulator comprising:
- an unregulated DC input terminal, for receiving an input voltage;
- a regulated DC output terminal;
- an output pass element, for supplying a power to said regulated DC output terminal, a source of said output pass element coupled to said unregulated DC input terminal, a drain of said output pass element connected to said regulated DC output terminal;
- a mirror pass element, for generating a mirror signal, a source and a gate of said mirror pass element being respectively coupled to said source and a gate of said output pass element, a drain of said mirror pass element generating said mirror signal correlated to an output current of said output pass element;
- a first amplifier, having an output terminal coupled to control said gate of said output pass element, a first input terminal of said first amplifier having a first reference signal, a second input terminal of said first amplifier coupled to said regulated DC output terminal;
- and
- a second amplifier, having an output terminal coupled to program said first reference signal, a first input terminal of said second amplifier having a second reference signal, a second input terminal of said second amplifier coupled to receive said minor signal.
4 more elements
A low drop-out regulation circuit comprising:
- an unregulated DC input terminal, for receiving an input voltage;
- a regulated DC output terminal;
- an output pass element, for supplying a power to said regulated DC output terminal, a source of said output pass element coupled to said unregulated DC input terminal, a drain of said output pass element connected to said regulated DC output terminal;
- a mirror pass element, for generating a mirror signal, a source and a gate of said mirror pass element being respectively coupled to said source and a gate of said output pass element, a drain of said mirror pass element generating said mirror signal correlated to an output current of said output pass element;
- a first amplifier, having an output terminal coupled to control said gate of said output pass element, a first input terminal of said first amplifier having a fourth reference signal, a second input terminal of said first amplifier coupled to receive said mirror signal;
- and
- a second amplifier, having an output terminal coupled to program said fourth reference signal, a first input terminal of said second amplifier having a third reference signal, a second input terminal of said second amplifier coupled to said regulated DC output terminal.
4 more elements
A low drop-out regulator comprising:
- an unregulated DC input terminal, receiving an input voltage;
- a regulated DC output terminal;
- a pass circuit, coupled between said unregulated DC input terminal and said regulated DC output terminal for supplying a power to said regulated DC output terminal;
- and
- an amplifying circuit, controlling said pass circuit of said low drop-out regulator for providing a constant voltage or/and a constant current in response to a first reference signal and an output voltage;
- wherein said first reference signal is utilized to judge said output voltage for controlling said pass circuit;
- said first reference signal is programmed in response to an output current.
4 more elements
A low drop-out regulator comprising:
- an unregulated DC input terminal, receiving an input voltage;
- a regulated DC output terminal;
- a pass circuit, coupled between said unregulated DC input terminal and said regulated DC output terminal for supplying a power to said regulated DC output terminal;
- and
- an amplifying circuit, controlling said pass circuit of said low drop-out regulator for providing a constant voltage or/and a constant current in response to a reference signal and an output current;
- wherein said reference signal is utilized to judge said output current for controlling said pass circuit;
- said reference signal is programmed in response to an output voltage.
4 more elements
Dependencies are inferred from the claim text.