A method for stability compensation of low-load-capacitor low-power LDO

A fast-transient capacitorless low dropout regulator

“…Due to the small static current and the large parasitic capacitance of the power transistor, the slew rate is very limited, and the transient response becomes worse; 2) Because the dominant pole of the system is at the gate of the power transistor, R of the power transistor becomes larger when the load is light, the dominant pole is close to zero, and the bandwidth is reduced, which makes the stability worse, so frequency compensation is necessary in the circuit. Common compensation methods nowadays include zero-pole tracking compensation [1]，Miller compensation [2], Q-attenuation technology [3] and damping coefficient control [4]. The improvement of transient performance of capacitorless LDO is mainly realized by using the high slew-rate error amplifier [5] or adding additional transient enhancement circuit [6].…”