LDO circuit

The utility model provides an LDO circuit which comprises an operational amplifier and a power supply rejection ratio sub-circuit, the power supply rejection ratio sub-circuit comprises a superposition power tube module and a feedback loop module, the superposition power tube module enables power supply ripples to generate shunt so as to reduce output of the power supply ripples, and the feedback loop module is connected with the operational amplifier. The feedback loop module is used for providing stable voltage for the input end of the operational amplifier; the superposed power tube module comprises an eleventh transistor and a twelfth transistor, the source electrode of the eleventh transistor is connected with an external power supply, the grid electrode of the eleventh transistor is connected with the operational amplifier, the drain electrode of the eleventh transistor is connected with the source electrode of the twelfth transistor, and the drain electrode of the eleventh transistor is connected with