| 摘要 |
A low-dropout voltage regulator apparatus includes a voltage source circuit, an error amplifier, an output transistor, a resistor-capacitor circuit, a detection circuit, and a current adjusting circuit. The voltage source circuit generates a reference voltage signal and at least one threshold voltage signal. The error amplifier receives the reference voltage signal and a feedback voltage signal to generate an output control signal. The output transistor provides an output current for the output terminal according to the output control signal. The resistor-capacitor circuit generates the feedback voltage signal using voltage dividing according to a voltage corresponding to the output current. The detection circuit compares at least one threshold voltage signal with the output voltage to generate at least one control voltage signal. The current adjusting circuit adaptively adjusts the current passing though the output transistor to decrease the transient response time according to the at least one control voltage signal. |
| 主权项 |
1. A low-dropout voltage regulator apparatus, comprising:
a voltage source circuit, arranged to generate a reference voltage signal and at least one threshold voltage signal; an error amplifier, coupled to the voltage source circuit, the error amplifier arranged to receive the reference voltage signal and a feedback voltage signal to generate an output control signal; an output transistor, coupled to the error amplifier, the output transistor arranged to receive the output control signal and provide an output current for the output terminal according to the output control signal; a resistor-capacitor circuit, coupled to the error amplifier and the output transistor, the resistor-capacitor circuit arranged to generate the feedback voltage signal by performing voltage dividing according to a voltage corresponding to the output current; a detection circuit, coupled to the voltage source circuit, the detection circuit arranged to receive the at least one threshold voltage signal and an output voltage at the output terminal, and compare the at least one threshold voltage signal with the output voltage to generate at least one control voltage signal; and a current adjusting circuit, coupled to the output terminal, the detection circuit and the error amplifier, the current adjusting circuit arranged to adjust the output control signal generated by the error amplifier and adaptively adjust a current passing through the output transistor according to the at least one control voltage signal, so as to decrease a transient response time of the low-dropout voltage regulator. |
