一种低电压高精度LDO稳压器的设计  

Design of a LDO Regulator with High Accuracy and Low Voltage

作　　者：刘宗福 马冬冬 

机构地区：[1]解放军92785部队,秦皇岛166200

出　　处：《变频技术应用》2015年第3期93-97,共5页INVERTER TECHNOLOGIES AND APPLICATIONS

摘　　要：为适应便携式电子产品对低压低功耗电源的应用需求，设计了一种可在低电源电压下工作，具有低功耗、低温度系数和高电源电压抑制比的低压降线性稳压器（LDO）。对传统电路做出一些改进，带隙基准电路基于对正负温度系数电流加权求和的原理，误差放大器采用两级差分放大器，调整管使用大功率PMOS管。基于0．25um CMOS工艺模型，使用HSPICE进行了仿真，结果表明：设计的LDO输出电压为0．9V，漏失电压170mV，温度系数8．4ppm／℃，带负载能力15mA，电路的主要性能指标均达到实际应用需求。To satisfy the portable electronic products＇ needs of low voltage and low power dissipation electrical source, a low dropout voltage regulator with low supply voltage, low power dissipation, low temperature coefficient and high PSRR is designed. Some improvement is made on the traditional circuit. The bandgap reference circuit is based on he sum of positive and negative temperature coefficient current. The error amplifier is realized by two-stage amplifier, and the pass element is PMOS. The LDO is implemented in a standard 0.25um COMS process and simulated with HSPICE. The simulation result is as follows： output voltage being 900mV, dropout voltage being170mV, temperature coefficient is 8.4ppm/℃, and the maximal output load current 15mA. The performance of designed circuit can satisfy the need of practical application.

关 键 词：低压降线性稳压器 带隙基准电路 低电压 温度系数 

分 类 号：TM44[电气工程—电器]