Low-dropout voltage regulator with level limiter limiting...

Details Low-dropout voltage regulator with level limiter limiting... Low-dropout voltage regulator with level limiter limiting...

2009-12-10

2011-10-18

Laxton, Gary L (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S274000, C323S275000, C323S281000

Reexamination Certificate

active

08040118

ABSTRACT:
A low-dropout (LDO) voltage regulator that includes an error amplifier which compares a reference voltage with a feedback voltage of an output voltage and outputs an error signal based on the result of the comparison, the error amplifier being biased by an input voltage; a first MOS transistor having a gate electrically connected to the error signal, a source electrically connected to the input voltage and a drain electrically connected to the output voltage; a voltage divider which transmits a predetermined part of the output voltage to the error amplifier as feedback voltage; and a level limiter which limits a level of the output voltage from changing beyond and below an offset voltage when a level of a load current changes. In accordance with embodiments, A predetermined number of comparators and MOS transistor type-switches are provided to enhance the slew ratio of the regulated output voltage and to reduce standby electricity consumption.

REFERENCES:
patent: 5686821 (1997-11-01), Brokaw
patent: 6157182 (2000-12-01), Tanaka et al.
patent: 7015680 (2006-03-01), Moraveji et al.
patent: 2007/0285077 (2007-12-01), Hasegawa

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