关键词: 超前相位补偿, 负载调整率, 环路稳定性

Abstract: 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 0.25 μm 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.

Key words: phase-lead compensation, load regulation, loop gain stability