Robust ramp controlled enable for voltage regulator

Details Robust ramp controlled enable for voltage regulator Robust ramp controlled enable for voltage regulator

2007-01-02

2007-01-02

Vu, Bao Q. (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S288000, C323S901000

Reexamination Certificate

active

11288882

ABSTRACT:
A voltage regulator including a bandgap control circuit that maintains the regulator's bandgap voltage at a predetermined voltage level after an externally generated enable signal is de-asserted until the regulated output voltage has dropped below a predetermined low reference voltage. The bandgap control circuit includes a latch that is set by the enable control signal to generate a bandgap control signal, which is used to activate a bandgap reference generator that generates the bandgap voltage. The latch is reset to de-assert the bandgap control signal by a logic gate and a low output voltage detector. The detector generates a low output voltage detection signal when the regulated output voltage falls below a low reference voltage. The logic gate generates a rising edge signal that resets the latch only when the enable signal is de-asserted and the detector generates the detection signal, thereby preventing unintended shutdown of the bandgap reference generator.

REFERENCES:
patent: 5521809 (1996-05-01), Ashley et al.
patent: 6100677 (2000-08-01), Farrenkopf
patent: 6278624 (2001-08-01), Nelson
patent: 6430070 (2002-08-01), Shi et al.
patent: 6906499 (2005-06-01), Hussein et al.

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