Semiconductor circuit device and data processing system

Details Semiconductor circuit device and data processing system Semiconductor circuit device and data processing system

2008-03-18

2008-03-18

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S285000, C323S288000

Reexamination Certificate

active

07345461

ABSTRACT:
Occurrence of power supply noise arising in connection with a step-down action at the time of turning on power supply is to be restrained. A step-down unit is provided with a switched capacitor type step-down circuit and a series regulator type step-down circuit, and stepped-down voltage output terminals of the step-down circuits are connected in common. The common connection of the stepped-down voltage output terminals of both step-down circuits makes possible parallel driving of both, selective driving of either or consecutive driving of the two. In the consecutive driving, even if the switched capacitor type step-down circuit is driven after driving the series regulator type step-down circuit first to supply a stepped-down voltage to loads, the switched capacitor type step-down circuit will need only to be compensated for a discharge due to the loads, and a peak of a charge current for capacitors can be kept low. When operation of the switched capacitor type step-down circuit is started, no large rush current arises, and occurrence of noise is restrained.

REFERENCES:
patent: 4642556 (1987-02-01), Pecukonis
patent: 5229761 (1993-07-01), Fuse
patent: 6654263 (2003-11-01), Kurotsu
patent: 7009858 (2006-03-01), Umeda et al.
patent: 2002-325431 (2001-04-01), None
patent: 2002-369552 (2001-06-01), None

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