一款采用超前相位补偿技术的低压差线性稳压器

Low-Dropout Regulator with Phase-Lead Compensation

设计了一种具有高稳定性、能够驱动较大负载电流的低压差线性稳压器(LDO)电路,输入电压为3.0~6.0 V,输出电压为2.8 V。采用超前相位补偿技术,产生一组零极点对,零点补偿前面环路中的极点,使得LDO电路具有稳定的环路结构,得到稳定的输出电压。基于CSMC 0.25μm EN BCDMOS工艺完成电路和版图的设计。电路仿真结果表明电路的负载调整率为0.03%/A,线性调整率为0.13%/V,最大驱动的负载电流为10 mA。在不同负载条件下,LDO环路的最差相位裕度能够达到64.1°。

A low-dropout regulator(LDO)with high stability,which can drive high current load is designed.The input voltage is 3.0-6.0 V,and the output voltage is 2.8 V.Using phase-lead compensation technology,a pair zero-pole is produced,and the zero can compensates the pole produced by the loop circuit,thus the lowdropout regulator has a stable topology and a stable output voltage.Based on CSMC 0.25μm technology,this design completes the schematic and layout.The simulation results illustrate that the load regulation is 0.03%/A,the line regulation is 0.13%/V,and the biggest output load current is 10 mA.The worst phase margin of this LDO loop can reach 64.1°at different current load condition.