Switching power supply device, semiconductor integrated...

Details Switching power supply device, semiconductor integrated... Switching power supply device, semiconductor integrated...

2006-10-26

2008-08-05

Richards, N. Drew (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C327S111000, C323S282000

Reexamination Certificate

active

07408388

ABSTRACT:
There are provided a switching power supply device performing a stable operation with fast response, a semiconductor integrated circuit device, and a power supply device.A capacitor is provided between the output side of an inductor and a ground potential. A first power MOSFET supplies an electric current from an input voltage to the input side of the inductor. A second power MOSFET turned on when the first power MOSFET is off allows the input side of the inductor to be of a predetermined potential. A first feedback signal corresponding to an output voltage obtained from the output side of the inductor and a second feedback signal corresponding to an electric current flowed to the first power MOSFET are used to form a PWM signal. The first power MOSFET has plural cells of a vertical type MOS-construction. The number of cells is 1/N. A detection MOSFET in which the gains and the drains are shared over the same semiconductor substrate with the first power MOSFET is provided to form a second feedback signal.

REFERENCES:
patent: 5544032 (1996-08-01), Mimura
patent: 6064580 (2000-05-01), Watanabe et al.
patent: 6559684 (2003-05-01), Goodfellow et al.
patent: 6979985 (2005-12-01), Yoshida et al.
patent: 7126388 (2006-10-01), Harriman
patent: 7138786 (2006-11-01), Ishigaki et al.

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