Low drop-out voltage regulator having high ripple rejection and

Details Low drop-out voltage regulator having high ripple rejection and Low drop-out voltage regulator having high ripple rejection and

1996-04-12

1997-09-30

Krishnan, Aditta

Electricity: power supply or regulation systems

Output level responsive

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

H02M 3337

Patent

active

056729596

ABSTRACT:
A low drop-out regulator circuit that has high ripple rejection and low power consumption. A first local feedback loop is a high-speed, high-bandwidth loop that actively rejects noise from the input source to the regulator. A second feedback loop, having lower speed and a correspondingly lower bandwidth than the first feedback loop, regulates the output voltage. Each feedback loop is separately optimized for its respective bandwidth requirements and, therefore, the regulator is highly efficient. The first feedback loop comprises an amplifier and a pair of PMOS transistors configured as a current mirror with current gain. The first feedback loop generates a first current for charging an output capacitor. Feedback ensures that the first current is proportional to a second current generated by the second feedback loop while rejecting noise from the input source. The second feedback loop comprises a transconductance amplifier that controls the second current with feedback such that the first current charges the output capacitor to the desired output voltage level. The second loop has a lower bandwidth than the first loop because the bandwidth of the second feedback loop is dominated by a relatively large output capacitance and compensation capacitance, while the bandwidth of the first feedback loop is dominated by the relatively small gate capacitances of the pair of transistors and a relatively small compensation capacitance.

REFERENCES:
patent: 4731574 (1988-03-01), Melbert
patent: 4736151 (1988-04-01), Dishner
patent: 4920309 (1990-04-01), Szepesi
patent: 5412308 (1995-05-01), Brown
patent: 5461302 (1995-10-01), Garcia et al.
"Step-Up/Step Down Converters Power Small Portable Systems", Bruce D. Moore, EDN, pp. 81-82, Feb. 3, 1994.

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