Step-down power supply

Details Step-down power supply Step-down power supply

2007-12-11

2007-12-11

Lam, Tuan T (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C327S541000

Reexamination Certificate

active

11176285

ABSTRACT:
A step-down power supply receives an external power supply voltage and supplies power at a reduced voltage from an output node to a load. The power supply also receives a reference voltage and a control signal indicating the whether the load is active or not. The reduced power supply voltage is held equal to the reference voltage by adjustment of the voltage at an internal control node. To prevent fluctuations in the reduced power supply voltage at active-inactive transitions of the load, the power supply includes circuitry for pulling the voltage at the internal control node both up and down, circuitry for leaking current from the output node to ground, circuitry for temporarily raising and lowering the reference voltage, or a capacitor coupling the reference voltage signal line to the control signal line.

REFERENCES:
patent: 5321653 (1994-06-01), Suh et al.
patent: 5696465 (1997-12-01), Ishizuka
patent: 6184744 (2001-02-01), Morishita
patent: 6998903 (2006-02-01), Jin
patent: 2003/0184362 (2003-10-01), Kwon
patent: 2004/0212422 (2004-10-01), Jung et al.
patent: 2004/0217804 (2004-11-01), Moon et al.
patent: 11-214617 (1999-08-01), None

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