High-speed LDO driver circuit using adaptive impedance control
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United States of America Patent
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Jul 21, 2015
Grant Date -
Jun 13, 2013
app pub date -
Jun 22, 2012
filing date -
Dec 12, 2011
priority date (Note) -
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Abstract
The present document relates to linear regulators or linear voltage regulators configured to provide a constant output voltage. In particular, the present document relates to driver circuits of low-dropout (LDO) regulators. A driver circuit (300) for driving a pass device (201) of a linear regulator (120) is described. The driver circuit (300) comprises a driver stage (110) adapted to regulate a driver gate (220) for connecting to the gate of the pass device (201); wherein the driver stage (110) comprises a transistor diode (210) having the driver gate (220); and a feedback transistor (305) having a source and a drain coupled to a source and drain of the transistor diode (210); wherein a feedback voltage at the gate of the feedback transistor (305) is regulated based on the output current of the pass device (201).
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