Voltage regulator

Details Voltage regulator Voltage regulator

2011-08-23

2011-08-23

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

Reexamination Certificate

active

08004257

ABSTRACT:
A voltage regulator has a first error amplifier circuit that amplifies a difference between a first reference voltage and a voltage based on an output voltage of an output transistor, and an overcurrent protection circuit that detects an overcurrent flowing through the output transistor and limits a current of the output transistor. The overcurrent protection circuit has an output current detection transistor that feeds a detection current in accordance with an output current of the output transistor, a voltage generation circuit that generates a voltage based on the detection current, a second error amplifier circuit that amplifies a difference between the voltage from the voltage generation circuit and a voltage set by a second reference voltage supplied by a temperature detection circuit and a voltage based on the output voltage, and an output current limiting transistor that controls a gate voltage of the output transistor and has a gate that is controlled by an output of the second error amplifier circuit.

REFERENCES:
patent: 6831626 (2004-12-01), Nakamura et al.
patent: 2008/0024099 (2008-01-01), Oki et al.
patent: 2009/0278518 (2009-11-01), Takagi
Patent Abstracts of Japan, publication No. 02-189608, publication date Jul. 25, 1990.

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