Voltage regulator having overcurrent protection circuit

Details Voltage regulator having overcurrent protection circuit Voltage regulator having overcurrent protection circuit

2007-06-19

2007-06-19

Jackson, Stephen W. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

C361S093100, C361S093900, C361S093700, C323S282000

Reexamination Certificate

active

11267773

ABSTRACT:
An overcurrent protection circuit for a voltage regulator has a first transistor having a gate for connection to a gate of an output transistor of the voltage regulator, a resistor connected to a drain of the first transistor, an output voltage detecting transistor having a gate connected to an output terminal of a dividing resistance circuit of the voltage regulator, and a current mirror circuit having an input terminal connected to the drain of the output voltage detecting transistor. A second transistor has a gate connected to the drain of the first transistor and a drain connected to an output terminal of the current mirror circuit. A third transistor has a gate connected to the output terminal of the current mirror circuit and a drain for connection to the gate of the output transistor of the voltage regulator.

REFERENCES:
patent: 6801419 (2004-10-01), Fukui
patent: 6922321 (2005-07-01), Katoh et al.
patent: 6977491 (2005-12-01), Caldwell et al.
patent: 7019584 (2006-03-01), Bartel et al.
patent: 2005/0035749 (2005-02-01), Bo et al.

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