Voltage regulator power management apparatus

Details Voltage regulator power management apparatus Voltage regulator power management apparatus

2005-11-29

2005-11-29

Sterrett, Jeffrey (Department: 2838)

Electricity: power supply or regulation systems

Input level responsive

C323S274000, C323S275000, C323S281000, C323S284000, C323S285000

Reexamination Certificate

active

06969981

ABSTRACT:
Quiescent currents in a circuit that includes a regulator are reduced by disabling selected portions of the circuit. A window comparator is selected activated to evaluate the input voltage such that a first operating mode is activated when the input voltage is within a predetermined voltage range and a second operating mode is activated when the input voltage is outside of the predetermined voltage range. The battery voltage is used a reference signal when the first mode is selected such that a voltage reference circuit can be disabled to reduce power, while the voltage reference circuit is enabled when the second mode is selected. Another comparator circuit is periodically activated to compare the reference signal to the output voltage. The regulator is disabled after the output voltage exceeds a first level. The output voltage collapses below a second level associated, the evaluation and regulation process is repeated.

REFERENCES:
patent: 5414341 (1995-05-01), Brown
patent: 5598093 (1997-01-01), Acatrinei
patent: 5949226 (1999-09-01), Tanaka et al.
patent: 6204654 (2001-03-01), Miranda et al.
patent: 6512353 (2003-01-01), Sanzo et al.
“LM2612 400mA Sub-miniature, Programmable, Step-Down DC-DC Converter for Ultra Low-Voltage Circuits,”National Semiconductor Corporation, May 2002 (19 pages).
“LM2623 Ratio Adaptive Gated Oscillator Based, DC DC Boost Converter-Low Vin, Low Ripple, General Purpose,”National Semiconductor Corporation, Nov. 2002 (11 pages).

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