摆率增强的高瞬态响应无片外电容线性稳压器

Enhanced swing rate high transient response cap-free linear regulator

针对无片外电容低压差线性稳压器瞬态响应差的问题,本文提出了一种摆率增强电路,该设计采用了动态密勒补偿技术,使得低压差线性稳压器有良好的环路稳定性。本文基于SilTerra公司的标准0.18μm的CMOS工艺,通过最终的仿真,该设计的低压差线性稳压器在负载电流20 mA~200μA的瞬态变化下过冲电压仅有80 mV,恢复时间0.5μs,线性调整率与负载调整率的最大值分别为0.036%、6.4%。降低了低压差线性稳压器输出的过冲电压以及恢复时间,实现了具有高瞬态响应的无片外电容低压差线性稳压器。

In view of the problem of the poor transient response of cap-free low-dropout regulator(LDO),a swing rate-enhanced circuit is proposed in this paper,which reduces the overshoot voltage and recovery time of the LDO output.The design adopts the dynamic Miller compensation technology,which makes the LDO loop more stable.This design is based on SilTerra′s standard 0.18μm CMOS technology.The final simulation experiment shows that when the transient load current is within the range from 20 mA to 200μA,the LDO overshoot voltage is only 80 mV,the recovery time is 0.5μs,the maximum linear adjustment ratio is 0.036%,and the load adjustment ratio is 6.4%.This design makes the LDO without an off-chip capacitor and with a high transient response a reality.