Voltage regulator and reference voltage generation circuit

A reference voltage generation circuit, comprises:

• a reference voltage generator configured to be controlled by a control signal to generate a reference voltage;
• and
• a control circuit configured to generate the control signal according to a feedback voltage and the reference voltage,
• wherein the reference voltage is configured to trace the feedback voltage when the feedback voltage being decreased gradually;
• wherein the control circuit comprises:
• a comparator configured to perform a comparison operation on the feedback voltage and the reference voltage to generate a comparison result signal;
• a latch circuit configured to receive and latch the comparison result signal to generate a latched comparison result signal;
• and
• a control unit configured to generate the control signal according to the latched comparison result signal;
• wherein the latch circuit comprises:
• an SR flip-flop comprising a setting terminal for receiving the comparison result signal, a resetting terminal, and an output terminal for outputting the latched comparison result signal;
• and
• a delay circuit coupled between the resetting terminal and the output terminal of the SR flip-flop.

A voltage regulator comprising:

• a voltage conversion circuit configured to convert an input voltage to an output voltage at an output terminal of the voltage regulator according to a control signal;
• a voltage divider coupled to the output terminal and configured to generate a first feedback voltage at a first node and a second feedback voltage at a second node, wherein the first feedback voltage and the second feedback voltage are positively correlated with the output voltage, and the second feedback voltage is less than the first feedback voltage;
• and
• an error amplifier comprising an inverting input terminal coupled to the first node, a non-inverting input terminal for receiving a reference voltage, and an output terminal for outputting the control signal;
• and
• a reference voltage generation circuit configured to generate the reference voltage, wherein the reference voltage is reduced in response to a decrease in the second feedback voltage to trace the decrease in the second feedback voltage during the voltage regulator being scaling-down mode.