This paper analyzes the stability and transient response enhancement limit of traditional LDO system and a transient response enhancement technique of on-chip LDO system is presented.Based on the analysis

a transient response enhancement technique fully integrated on-chip is put forward.The proposed scheme not only results in stability within a wide range of load variation

but also gets a good ripple rejection without off-chip capacitor and equivalent series resistor.It is demonstrated by simulation that the proposed circuit dissipates only 64A of quiescent current with empty load and it is capable of delivering load current up to 800mA

the power supply rejection rate at 1KHz is about -60dB.For a load step of 800mA/5s

the ci

rcuit has a maximum undershoot of 400mV and a maximum overshoot of 536mV.The recovery time is only 6.7s and 12.8s respectively and the layout area is about 0.64mm

2

.