Linear regulator for outputting normal output voltage and vehicle including the same

A linear regulator comprising:

• a first output transistor connected between a first input terminal to which a first input voltage is applied and an output terminal from which an output voltage is outputted;
• a second output transistor connected between a second input terminal to which a second input voltage is applied and the output terminal;
• and
• a control circuit configured to control the first output transistor when the second input voltage of a predetermined range is not supplied to the second input terminal, and to control the second output transistor when the first input voltage of the predetermined range is not supplied to the first input terminal,
• wherein the control circuit includes an operational amplifier configured to receive a reference voltage and a feedback voltage generated based on the output voltage, and to output a control signal based on a difference between the reference voltage and the feedback voltage,
• wherein the operational amplifier is configured such that, when the first input voltage of the predetermined range is supplied to the first input terminal and the second input voltage of the predetermined range is supplied to the second input terminal, the operational amplifier:
• uses the second input voltage as a driving voltage of the operational amplifier when the first input voltage is smaller than the second input voltage;
• and
• uses the first input voltage as the driving voltage of the operational amplifier when the second input voltage is smaller than the first input voltage,
• wherein the operational amplifier is configured to use the first input voltage as the driving voltage of the operational amplifier when the second input voltage of the predetermined range is not supplied to the second input terminal, and to use the second input voltage as the driving voltage of the operational amplifier when the first input voltage of the predetermined range is not supplied to the first input terminal,
• wherein the operational amplifier includes a first diode and a second diode,
• wherein the first input voltage is applied to an anode of the first diode,
• wherein the second input voltage is applied to an anode of the second diode, and
• wherein a cathode of the first diode and a cathode of the second diode are connected in common, and cathode voltages of the first diode and the second diode are used as the driving voltage of the operational amplifier.

A linear regulator comprising:

• a first output transistor connected between a first input terminal to which a first input voltage is applied and an output terminal from which an output voltage is outputted;
• a second output transistor connected between a second input terminal to which a second input voltage is applied and the output terminal;
• and
• a control circuit configured to control the first output transistor when the second input voltage of a predetermined range is not supplied to the second input terminal, and to control the second output transistor when the first input voltage of the predetermined range is not supplied to the first input terminal,
• wherein, when the first input voltage of the predetermined range is supplied to the first input terminal and the second input voltage of the predetermined range is supplied to the second input terminal, the control circuit is configured to uses the second input voltage as a driving voltage of the control circuit when the first input voltage is smaller than the second input voltage, and to use the first input voltage as the driving voltage of the control circuit when the second input voltage is smaller than the first input voltage,
• wherein the control circuit is configured to use the first input voltage as the driving voltage of the control circuit when the second input voltage of the predetermined range is not supplied to the second input terminal, and to use the second input voltage as the driving voltage of the control circuit when the first input voltage of the predetermined range is not supplied to the first input terminal,
• wherein the control circuit includes a first diode and a second diode,
• wherein the first input voltage is applied to an anode of the first diode,
• wherein the second input voltage is applied to an anode of the second diode, and
• wherein a cathode of the first diode and a cathode of the second diode are connected in common, and cathode voltages of the first diode and the second diode are used as the driving voltage of the control circuit.