A low dropout regulator LDO, power supply circuit, comprising: an operational amplifier; a first transistor; and a resistance feedback network; wherein a negative electrode input end of the operational amplifier is configured to be connected to a control voltage (Vramp); an output end of the operational amplifier is connected to a gate electrode of the first transistor; a source electrode of the first transistor is configured to be connected to a power supply voltage (VBAT); a drain electrode of the first transistor is an output end of the LDO power supply circuit; and the resistance feedback network is connected between the drain electrode of the first transistor and the positive electrode input end of the operational amplifier; the resistance feedback network comprises a first resistance, a second resistance, a third resistance, and a second transistor; wherein: a first end of the first resistance is connected to the drain electrode of the first transistor; a second end of the first resistance is connected to the positive electrode input end of the operational amplifier; a first end of the second resistance is connected to the second end of the first resistance; a second end of the second resistance is grounded; a first end of the third resistance is connected to the second end of the first resistance; a second end of the third resistance is connected to a drain electrode of the second transistor; a source electrode of the second transistor is grounded; and the first resistance and the second resistance jointly form a first feedback coefficient; the first resistance, the third resistance, and the second transistor jointly form a second feedback coefficient; the first feedback coefficient is different from the second feedback coefficient; characterized in that a positive electrode input end of the operational amplifier is an input end of the LDO power supply circuit; a gate electrode of the second transistor is configured to be connected to the control voltage (Vramp) and the second transistor is controlled by the control voltage (Vramp) to turn on. an operational amplifier; a first transistor; and a resistance feedback network; wherein a negative electrode input end of the operational amplifier is configured to be connected to a control voltage (Vramp); an output end of the operational amplifier is connected to a gate electrode of the first transistor; a source electrode of the first transistor is configured to be connected to a power supply voltage (VBAT); a drain electrode of the first transistor is an output end of the LDO power supply circuit; and the resistance feedback network is connected between the drain electrode of the first transistor and the positive electrode input end of the operational amplifier; the resistance feedback network comprises a first resistance, a second resistance, a third resistance, and a second transistor; wherein: a first end of the first resistance is connected to the drain electrode of the first transistor; a second end of the first resistance is connected to the positive electrode input end of the operational amplifier; a first end of the second resistance is connected to the second end of the first resistance; a second end of the second resistance is grounded; a first end of the third resistance is connected to the second end of the first resistance; a second end of the third resistance is connected to a drain electrode of the second transistor; a source electrode of the second transistor is grounded; and the first resistance and the second resistance jointly form a first feedback coefficient; the first resistance, the third resistance, and the second transistor jointly form a second feedback coefficient; the first feedback coefficient is different from the second feedback coefficient; characterized in that a positive electrode input end of the operational amplifier is an input end of the LDO power supply circuit; a gate electrode of the second transistor is configured to be connected to the control voltage (Vramp) and the second transistor is controlled by the control voltage (Vramp) to turn on. a first end of the first resistance is connected to the drain electrode of the first transistor; a second end of the first resistance is connected to the positive electrode input end of the operational amplifier; a first end of the second resistance is connected to the second end of the first resistance; a second end of the second resistance is grounded; a first end of the third resistance is connected to the second end of the first resistance; a second end of the third resistance is connected to a drain electrode of the second transistor; a source electrode of the second transistor is grounded; and the first resistance and the second resistance jointly form a first feedback coefficient; the first resistance, the third resistance, and the second transistor jointly form a second feedback coefficient; the first feedback coefficient is different from the second feedback coefficient; characterized in that a positive electrode input end of the operational amplifier is an input end of the LDO power supply circuit; a gate electrode of the second transistor is configured to be connected to the control voltage (Vramp) and the second transistor is controlled by the control voltage (Vramp) to turn on.