带有温度补偿的高稳定性低压差线性稳压器

Highly stable low-dropout linear regulator with temperature compensation

采用高温漏电流补偿技术设计了一种工作于-40～130℃的高稳定性低压差（LDO）线性稳压器．通过设计一种新型的动态米勒频率补偿结构，使LDO电路的稳定性与负载电流无关，达到了高稳定性设计要求．芯片设计基于CSMC公司的0．5／μm互补金属氧化物半导体（CMOS）混合信号模型，并通过了芯片测试验证．仿真与测试结果表明，该稳压器的输出电压温度漂移系数为2×10^-5／℃，负载瞬态响应的建立时间小于50ps，输出电压跳变小于50mV．电源抑制比在1kHz时为-50dB．当输出电流为150mA时，其输入-输出压差的典型值为170mV．

A highly stable low-dropout （LDO） regulator operated in an extended temperature range of -40 ℃ to 130 ℃ was presented by utilizing the design method of leakage current compensation in high temperature. The LDO regulator with a novel dynamic Miller frequency compensation structure provides high stability at any load, so the LDO regulator is unconditional stability. The proposed LDO regulator was implemented by using 0.5 /μm complementary metal-oxide semiconductor （CMOS） technology of CSMC Technologies Corporation. Simulation and experiment showed that the temperature coefficient for output voltage was only 2× 10^-5/℃ over the range of -40 ℃ to 130 ℃, and the regulator provided full load transient response of less than 50 mV overshoots and undershoots and less than 50 μs setting time. The powersupply rejection ratio at 1 kHz was -50 dB. The typical dropout was 170 mV at 150 mA loading.