一种宽电压范围高瞬态响应LDO的设计与实现  

Design and Implementation of a Wide Voltage Range and High Transient Response LDO

作　　者：戴澜[1] 栗元 DAI Lan;LI Yuan(North China University of Technology,Beijing 100144,China)

机构地区：[1]北方工业大学,北京100144

出　　处：《河南科技》2023年第16期4-10,共7页Henan Science and Technology

摘　　要：【目的】设计一款能满足DC-DC电源管理芯片宽输入电压范围需求,且能驱动片外功率MOS管的高瞬态响应低压差线性稳压器(LDO)。【方法】采用带高压管的共源共栅(Cascode)电流镜来完成对LDO的设计,使用带源极跟随器的Ahuja补偿结构,并采用双环路结构。【结果】该设计可满足系统的宽输入电压范围,能有效解决负载变化和片外开关管栅极大电容引起的频率稳定性问题,使LDO在全负载范围内保持稳定,确保系统的瞬态响应及负载调整率。【结论】基于华虹0.35μm BCD工艺来完成相关电路设计,电路的输入电压范围为3~24 V、输出电流范围0~250 mA。在500 kHz的开关频率下,输出下冲电压为22.9 mV、稳定时间为3.15μs,输出上冲电压为13.0 mV、稳定时间为2.96μs,负载调整率为60μV/mA。[Purposes]This paper aims to design a low voltage differential linear regulator(LDO)with high transient response,which can meet the requirements of wide input voltage range of DC-DC power management chip and drive off-chip power MOS transistors.[Methods]A Cascode current mirror with a high-voltage tube was used to complete the design of the LDO.The Ahuja compensation structure with a source follower was used,and a double-loop structure was used.[Findings]The design can meet the wide input voltage range of the system,and can effectively solve the problem of frequency stability caused by load change and large gate capacitance of off-chip switch tube,so that the LDO can remain stable in the full load range,and ensure the transient response and load regulation rate of the system.[Conclusions]The relevant circuit design is completed based on Huahong 0.35μm BCD process.The input voltage range of the circuit is 3~24 V and the output current range is 0~250 mA.At a switching frequency of 500 kHz,the output undershoot voltage is 22.9 mV,the stabilization time is 3.15μs,the output overshoot voltage is 13.0 mV,the stabilization time is 2.96μs,and the load regulation rate is 60μV/mA.

关 键 词：电源管理芯片 低压差线性稳压器 带源随器的Ahuja补偿 双环路 

分 类 号：TN433[电子电信—微电子学与固体电子学]