应用于BUCK-BOOST的低功耗高精度欠压锁定设计研究  

Research on Low-power High-precision Under-voltage Lockout Design Applied to BUCK-BOOST

作　　者：曹喜涛 郭仲杰 韩晓 刘申 苏昌勖 李晨 CAO Xitao;GUO Zhongjie;HAN Xiao;LIU Shen;SU Changxu;LI Chen(School of Automation and Information Engineering,Xi'an Uruversity uf Technology,Xi'an,710048,CHN)

机构地区：[1]西安理工大学自动化与信息工程学院,西安710048

出　　处：《固体电子学研究与进展》2021年第6期465-469,共5页Research & Progress of SSE

基　　金：国家自然科学基金面上项目(62171367);陕西省科技厅重点研发计划项目(2021GY-060);陕西省教育厅科学研究计划(19JC029);。

摘　　要：传统的欠压锁定电路离不开外部电路提供的基准电压和偏置电流,同时当进入欠压锁定状态时,基准电路无法关断,不利于芯片的低功耗设计。针对传统电路的缺点,设计了一种不需要外部基准电压和偏置电流,并且电路结构简单、响应速度快、温度漂移低、阈值随PVT变化较小、功耗较低的欠压锁定电路。基于0.18μm BCD工艺对提出的电路进行了全面的仿真与测试验证,研究结果表明,当电源电压下降时,电路在电源电压小于2.05 V时系统关闭;当电源电压上升时,电路在电源电压大于2.37 V时系统重新启动,欠压保护迟滞量为320 mV,在-40~85℃范围内欠压锁定迟滞电压精度为1.36%,功耗仅为22μW。该电路已在一款Buck-Boost型转换器中得到应用。Traditional under-voltage lockout circuit is inseparable from the reference voltage and bias current provided by external circuits. At the same time,when the under-voltage lockout state is entered,the reference circuit cannot be turned off,which is not conducive to the low-power design of the chip. Aiming at the shortcomings of traditional circuits,an under-voltage lockout circuit was designed,which did not require external reference voltage and bias current,and had simple circuit structure,fast response speed,low temperature drift,small threshold change with PVT and low power.Based on the 0.18 μm BCD process,the designed circuit had been fully simulated and verified. The research results show that when the power supply voltage drops,the circuit shuts down when the power supply voltage is less than 2.05 V,and when the power supply voltage rises,the system restarts when the power supply voltage is greater than 2.37 V. The under-voltage protection hysteresis is 320 mV,the under-voltage lockout hysteresis voltage accuracy is 1.36% in the range of-40~85℃,and the power consumption is only 22 μW. This circuit has been applied to a Buck-Boost converter.

关 键 词：欠压锁定 电源管理 基准电压 迟滞电压 

分 类 号：TN43[电子电信—微电子学与固体电子学]