Low quiescent current voltage regulator

Details Low quiescent current voltage regulator Low quiescent current voltage regulator

1995-01-19

1996-02-20

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

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

323351, G05F 144

Patent

active

054932033

ABSTRACT:
A low quiescent current voltage regulator particularly suited for providing current to the RTC/CMOS memory section of a notebook computer. The gate of the JFET is grounded, the drain connected to the main battery and the source connected to the RTC voltage input of the RTC/CMOS memory section. The JFET source voltage approaches the gate-source cutoff voltage of the JFET. This cutoff voltage is selected to be in the proper range for the RTC/CMOS memory section. A complete RTC voltage control circuit is configured to provide 5 volts from the system voltage when the computer is turned on, 3 to 5 volts from the JFET when the computer is turned off and the main battery is present and 3 volts from the RTC battery when the computer is turned off and the main battery is removed.

REFERENCES:
patent: 4319179 (1982-03-01), Jett, Jr.
patent: 4733159 (1988-03-01), Edwards et al.
patent: 4906913 (1990-03-01), Stanojevic
patent: 5023543 (1991-06-01), Tse
patent: 5105144 (1992-04-01), Trump
patent: 5164542 (1992-11-01), Hart

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