Low-dropout voltage regulator

Details Low-dropout voltage regulator Low-dropout voltage regulator

2007-05-15

2007-05-15

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Self-regulating

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

C323S280000

Reexamination Certificate

active

11326049

ABSTRACT:
The invention proposes a low dropout voltage regulator, including a feedback circuit, an operational amplifier, a transconductor, a current mirror, and a power transistor. The feedback circuit provides a voltage according to a current provided by the power transistor. An invert-phase input terminal of the operational amplifier is coupled with the feedback circuit, and the positive-phase input terminal of the operational amplifier receives a reference voltage. The transconductor is coupled to an output terminal of the operational amplifier, and controls the current, which is fed to the transconductor from the current mirror, according to the output voltage from the operational amplifier. The current mirror is coupled with the transconductor and drives the power transistor. The power transistor is coupled between the current mirror and the feedback circuit, so as to provide current to the feedback circuit.

REFERENCES:
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patent: 5929617 (1999-07-01), Brokaw
patent: 6188211 (2001-02-01), Rincon-Mora et al.
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Chaitanya K. Chava et al., “A Frequency Compensation Scheme for LDO Voltage Regulators” IEEE Transactions on Circuits and Systems—I: Regular Papers, vol. 51, No. 6, Jun. 2004, pp. 1041-1050.
Gabriel A. Rincon-Mora et al., “A Low-Voltage, Low Qulescent Current, Low Drop-Out Regulator” IEEE Journal of Solid-State Circuits, vol. 33, No. 1, Jan. 1998, pp. 36-44.

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