带使能端及保护电路的LDO设计

Design of a LDO with Enable Circuit and Protection Circuits

设计了一种带有使能端以及保护电路的低压差线性稳压器(LDO)。这种基于传统结构、带有使能端的LDO可在系统电路不工作时被关断,以减小电路功耗。使能信号可由数字模块输出。该LDO带有过流保护、短路保护以及过温保护电路,在过流、过温以及短路时能受到保护,避免电路被损坏。基于CSMC 0.5μm单阱工艺完成电路设计,输入电压为5V,输出电压为3V,最大输出电流为100mA,输出瞬态电压最大变化为4.26mV。

A low-dropout regulator （LDO） with enable circuit and protection circuits was designed based on traditional structures of LDO. The enable circuit could be controlled by the digital circuit and could shut off the LDO when the system did not work, so that the power consumption of the circuit could be reduced. The over- current protection circuit, short circuit protection circuit and thermal protection circuit ensured the stability of the LDO under tough circumstance. The circuit was designed based on CSMC 0. 5 μm single well process. The LDO input voltage was 5 V, the output voltage was 3 V, the maximum output current was 100 mA, and the maximum transient voltage variation was 4.26 mV.