Integrated low dropout linear voltage regulator with...

Details Integrated low dropout linear voltage regulator with... Integrated low dropout linear voltage regulator with...

2005-10-04

2005-10-04

Laxton, Gary L (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

Reexamination Certificate

active

06952091

ABSTRACT:
An integrated Low Dropout (LDO) linear voltage regulator provides improved current limiting. A differential voltage amplifier compares an output voltage to reference voltage and controls a pass transistor to make the output voltage substantially match the reference voltage. This is accomplished by sensing the output voltage of the voltage regulator for application to a first input of the differential amplifier and coupling a second input of the differential amplifier to the reference voltage. A current sense transistor utilizes current mirroring techniques to sense the current passing through the pass transistor to the output. This sensed current is compared to a reference current. The result of that comparison is fed back to the differential voltage amplifier to in a manner that increases the apparently sensed output voltage in situations where the sensed current exceeds the reference current.

REFERENCES:
patent: 5539603 (1996-07-01), Bingham
patent: 6407537 (2002-06-01), Antheunis
patent: 6664773 (2003-12-01), Cunnac et al.
patent: 6822428 (2004-11-01), Miyanaga et al.

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