Regulator and circuit device

A regulator for regulating an input voltage to output an output voltage, the regulator comprising:

• a voltage divider circuit configured to output, as a feedback voltage, a voltage generated by dividing the output voltage;
• an operational amplifier configured to compare the feedback voltage with a reference voltage;
• a drive transistor being disposed between a node at the input voltage and a node at the output voltage and configured to be controlled based on an output of the operational amplifier;
• a logic circuit configured to output an adjustment signal for the output voltage;
• and
• an output voltage adjustment circuit configured to adjust the output voltage based on the adjustment signal, wherein
• the voltage divider circuit includes:
• a plurality of resistors;
• and
• a plurality of switches, each switch of the plurality of switches being disposed in parallel with a corresponding resistor of the plurality of resistors,
• the output voltage adjustment circuit is configured to output, to the plurality of switches, a control signal in accordance with the adjustment signal,
• the output voltage is supplied as a power supply voltage to the output voltage adjustment circuit,
• the each switch of the plurality of switches includes an n-type transistor and a p-type transistor coupled in parallel, and
• the output voltage adjustment circuit includes:
• a first inverter configured to output a first control signal for controlling one of the n-type transistor and the p-type transistor;
• and
• a second inverter configured to receive an output of the first inverter and to output a second control signal for controlling another of the n-type transistor and the p-type transistor.

A regulator for regulating an input voltage to output an output voltage, the regulator comprising:

• a voltage divider circuit configured to output, as a feedback voltage, a voltage generated by dividing the output voltage;
• an operational amplifier configured to compare the feedback voltage with a reference voltage;
• a drive transistor being disposed between a node at the input voltage and a node at the output voltage and configured to be controlled based on an output of the operational amplifier;
• a logic circuit configured to output an adjustment signal for the output voltage;
• and
• an output voltage adjustment circuit configured to adjust the output voltage based on the adjustment signal, wherein
• the voltage divider circuit includes:
• a plurality of resistors;
• and
• a plurality of switches, each switch of the plurality of switches being disposed in parallel with a corresponding resistor of the plurality of resistors,
• the output voltage adjustment circuit is configured to output, to the plurality of switches, a control signal in accordance with the adjustment signal,
• the output voltage is supplied as a power supply voltage to the output voltage adjustment circuit, and
• the plurality of resistors include:
• a first resistor group disposed between a feedback voltage node from which the feedback voltage is output and a predetermined voltage node;
• and
• a second resistor group disposed between the node at the output voltage and the feedback voltage node.