Power switch circuit having variable resistor coupled...

Details Power switch circuit having variable resistor coupled... Power switch circuit having variable resistor coupled...

2008-12-15

2010-06-08

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C327S312000, C327S318000, C327S323000

Reexamination Certificate

active

07733133

ABSTRACT:
A power switch circuit includes an output transistor which is connected between a first power supply terminal and an output terminal, and drives a load, an abnormality detecting circuit which detects an abnormal state of the output transistor, a resistance element which generates a resistance component by a diffusion layer formed on a well region, and is provided between an input terminal and a control terminal of the output transistor, and a well potential switching circuit which switches a voltage to be supplied to the well region between a voltage of the output terminal and a voltage of a second power supply terminal based on a detection result by the abnormality detecting circuit.

REFERENCES:
patent: 5497285 (1996-03-01), Nadd
patent: 5500619 (1996-03-01), Miyasaka
patent: 6054890 (2000-04-01), Giacomo
patent: 6288596 (2001-09-01), Johansson et al.
patent: 6903597 (2005-06-01), Tai
patent: 7449935 (2008-11-01), Scollo et al.
patent: 7570085 (2009-08-01), Ishikawa et al.
patent: 5-198801 (1993-08-01), None
patent: 6-244414 (1994-09-01), None
patent: 2005-93763 (2005-04-01), None

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