Semiconductor circuit device and data processing system

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

2008-02-08

2010-02-16

Han, Jessica (Department: 2838)

Electric power conversion systems

Current conversion

With voltage division by storage type impedance

C323S284000, C323S288000, C307S110000

Reexamination Certificate

active

07663897

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.

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patent: 2002-369552 (2001-06-01), None

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