The low dropout linear regulator is a new generation of integrated circuit regulators. The biggest difference between it and the three terminal regulator is that the low dropout linear regulator (LDO) is a micro system on chip (SOC) with low self consumption. It can be used for current main channel control. The chip integrates hardware circuits such as mosfets with extremely low line conduction resistors, Schottky diodes, sampling resistors, and voltage divider resistors. It also has functions such as overcurrent protection, over temperature protection, precision reference sources, differential amplifiers, and retarders. "Pg is a new generation of ldo, which has the function of self checking each output state and delaying safe power supply. It can also be called power good, which means" good or stable power supply. "". Low-voltage differential linear regulators typically have extremely low intrinsic noise and high power supply rejection ratio (PSRR).