Low-dropout regulator and operation method thereof

A low-dropout (LDO) regulator, comprising:

• a reference voltage generation circuit, arranged to generate at least one reference voltage;
• an operational amplifier, coupled to the reference voltage generation circuit, arranged to control an output voltage of the LDO regulator via negative feedback in a LDO regulating mode of the LDO regulator;
• a transistor, coupled to the operational amplifier, arranged to generate the output voltage of the LDO regulator under control of the operational amplifier in the LDO regulating mode, for further use;
• and
• a multiphase configuration switching control circuit, coupled to the reference voltage generation circuit, the operational amplifier and the transistor, arranged to perform multiphase configuration switching control to perform multiple configuring operations on circuit architecture of the LDO regulator;
• wherein:
• the multiphase configuration switching control circuit performs a first configuring operation on the circuit architecture of the LDO regulator to enable a first dedicated current path corresponding to a first phase, to allow a target reference voltage used in the LDO regulating mode to reach a first predetermined range after the first configuring operation is performed;
• the multiphase configuration switching control circuit performs a second configuring operation on the circuit architecture of the LDO regulator to enable a second dedicated current path corresponding to a second phase, to allow the target reference voltage to reach a second predetermined range after the second configuring operation is performed;
• and
• the multiphase configuration switching control circuit performs a third configuring operation on the circuit architecture of the LDO regulator, to allow the target reference voltage to be used as a reference voltage input into the operational amplifier in the LDO regulating mode after the third configuring operation is performed.