摘要： 基于双有源反馈米勒补偿结构设计了一种单极点系统的无电容片上低压差线性稳压器，该线性稳压器中误差放大器采用全差分结构，两个并联的前馈通路可在提升电路瞬态响应性能的同时额外在功率管栅端构成推挽驱动级，最终电路在轻重载时具有对称的瞬态响应特性。基于TSMC 0.18µm BCD工艺仿真结果表明，在2 V~4 V电源电压下，输入输出最小压差为200 mV，最大负载电流为120 mA，瞬态响应恢复时间≤0.7 µs，相位裕度≥60°。

中图分类号：TN433 文献标志码：A DOI: 10.16157/j.issn.0258-7998.222997
中文引用格式： 徐晴昊. 一种快速瞬态响应片上LDO电路[J]. 电子技术应用，2023，49(3)：67-71.
英文引用格式： Xu Qinghao. A fast transient response on-chip low-dropout regulator[J]. Application of Electronic Technique，2023，49(3)：67-71.

A fast transient response on-chip low-dropout regulator

Abstract： Abstract： Based on dual active feedback with miller capacitor compensation (DAFMCC), a novel single pole system of capacitor-less on-chip low-dropout (LDO) voltage regulator circuit is presented. The LDO adopts a fully differential amplifier as the first gain stage, two parallel feedforward pathways can improve the transient response performance of the circuit meanwhile insert a push-pull stage at the gate of the power MOSFET which results in a symmetrical slewing behavior. The proposed LDO regulator is verified by TSMC 0.18 µm BCD process. The simulation results show that when supply voltage changes from 2 V to 4 V, the minimum dropout voltage is 200 mV, the maximum load current is 120 mA. The transient response recovery time is smaller than 0.7 µs, the phase margin is larger than 60°.

Key words : LDO；capacitor-less；fast transient response；frequency compensation