Low drop out voltage regulator
AssigneeMediatek Inc.
InventorsBernard Mark Tenbroek, Christopher Geraint Jones
Life of this patent
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Abstract
A low drop out voltage regulator, comprising first and second field effect transistors arranged in series between a regulator input and a regulator output; a third field effect transistor co-operating with the first field effect transistor to form a first current mirror; a fourth field effect transistor co-operating with the second field effect transistor to form a second current mirror; first and second control transistors, which advantageously are bipolar transistors connected in series with the third and fourth field effect transistors respectively so as to control the current flowing therein; and a controller for providing a control signal to the first and second bipolar transistor as a function of a voltage at the regulator output.
Claims16
A low drop out voltage regulator, comprising
- first and second field effect transistors arranged in series between a regulator input and a regulator output;
- a third field effect transistor co-operating with the first field effect transistor to form a first current mirror;
- a fourth field effect transistor co-operating with the second field effect transistor to form a second current mirror;
- first and second control transistors connected in series with the third and fourth field effect transistors respectively so as to control the current flowing therein;
- and
- a controller for providing a control signal to the first and second control transistors as a function of a voltage at the regulator output.
Dependencies are inferred from the claim text.