Low drop-out voltage regulator with efficient frequency...

Details Low drop-out voltage regulator with efficient frequency... Low drop-out voltage regulator with efficient frequency...

2009-01-21

2011-12-20

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S265000, C323S273000, C323S274000

Reexamination Certificate

active

08080982

ABSTRACT:
A low drop-out (LDO) voltage regulator with efficient frequency compensation is disclosed. The LDO voltage regulator includes an error amplifier, a transmission element, a voltage divider and a pole control unit. The error amplifier generates a control signal according to a reference voltage and a feedback voltage. The transmission element is coupled to the error amplifier, and adjusts an input voltage to generate an output voltage according to the control signal. The voltage divider is coupled to the transmission element, and performs a voltage division operation on the output voltage to generate the feedback voltage. The pole control unit is coupled to the transmission element, and provides and adjusts an output capacitor of the LDO voltage regulator to fix a frequency of a pole according to variation of an output impedance of the transmission element, so as to maintain loop stability.

REFERENCES:
patent: 5686821 (1997-11-01), Brokaw
patent: 6420857 (2002-07-01), Fukui
patent: 6690147 (2004-02-01), Bonto
patent: 7088082 (2006-08-01), Jung
patent: 2010/0052635 (2010-03-01), Wang

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