超低压差单片CMOS电压调整器的设计  

Design of a One-Chip Ultra Low-Dropout CMOS Voltage Regulator

作　　者：肖剑[1] 刘鲲 邱颜章[1] 刘元成 

机构地区：[1]长安大学电子与控制工程学院,陕西西安710064 [2]清华力合微电子有限公司,广东深圳518057

出　　处：《微电子学与计算机》2009年第5期44-47,51,共5页Microelectronics & Computer

摘　　要：设计并实现了一种最大输出电流为500mA的超低压差的单片CMOS电压调整器,对其电路结构及工作原理进行了分析并给出各子电路模块的设计.提出了一种新的内置频率补偿技术,可实现外接低ESR（串联等效电阻）的输出电容,极大地降低成本和改善瞬态响应,实现了精确的过流保护.采用Vanguard0.5μm CMOS混合信号工艺进行流片验证,测试结果表明输出压差的典型值为100mV,工作电压范围2.5~7V,电流从10mA到500mA跳变时瞬态最大过冲电压为50mV,转换时间小于1μs.Design and realize a ultra low dropout voltage regulator with maximum 500mA output current,analyze the circuit structure and the subcircuit design.A novel internal frequency compensation technique is presented,which can implement the use of low equivalent series resistance（ESR）output capacitor,thus improve transient response and reduce the cost greatly,and accurate overcurrent protection is realized.Test result from a verification in Vanguard 0.5μm CMOS technology proved the feasibility of this method,the measured typical dropout voltage is 100mV,operating voltage range is 2.5～7V,output overshoot voltage is less than 50mV when load current stepped from 1mA to 500mA,skew time is less than 1μs.

关 键 词：CMOS 电压调整器 频率补偿 稳定性 

分 类 号：TN4[电子电信—微电子学与固体电子学]