一种快速瞬态响应无片外电容LDO的设计OA
Design of a Fast Transient Response LDO with No Off-Chip Capacitor
提出了一种快速瞬态响应无片外电容低压差线性稳压器(LDO).该低压差线性稳压器使用 NMOS 作为调整管,利用失调电容将误差放大器输出与调整管的栅极耦合,提高了功率管栅极的响应速度,同时通过对输出电流进行取样产生可变基准,增大了误差放大器的输出摆率,提高了系统的瞬态响应.基于 HHGrace 0.35 μm BCD 工艺进行仿真以及流片测试,结果表明:系统的输入电压范围为1.7 V～5.5 V,具有1.2 V～3.3 V 动态输出范围;在无外接电容的情况下,当输出电流在10 mA～400 mA 范围内跳变时,下冲电压为80 mV,过冲电压为112 mV,系统响应时间小于1.5 μs.
A fast transient response low-dropout regulator(LDO)with no off-chip capacitor is proposed.The NMOS is used to be the transistor of this LDO,and the gate of the NMOS transistor is coupled with the output of the error amplifier by offset capacitor to acceler-ate the gate response speed,the output slew rate of the error amplifier is increased by sampling the output current to generate a variable reference,which improves the transient response of the system.Based on HHGrace 0.35 μm BCD process,the simulation and test results show that the input voltage range of the system is 1.7 V～5.5 V,and the dynamic output range is 1.2 V～3.3 V,the downshoot voltage is 80 mV and the overshoot voltage is 112 mV when the output current jumps in the range of 10 mA～400 mA without external capacitor,and the system response time is less than 1.5 μs.
王家祥;张涛
武汉科技大学信息科学与工程学院,湖北 武汉 430081武汉科技大学信息科学与工程学院,湖北 武汉 430081
信息技术与安全科学
低压差线性稳压器无片外电容快速瞬态响应电荷泵NMOS
low-dropout regulatorno off-chip capacitorfast transient responsecharge pumpNMOS
《电子器件》 2026 (2)
241-247,7
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