一种高增益快速响应且无片外电容型LDO设计∗

摘要

设计了一款无片外电容低压差线性稳压器( LDO),其瞬态响应速度极快,且增益高、带宽宽,输入电压范围为2.8 V~5.0 V,输出电压2.4 V。使用HSPICE仿真验证了直流、交流、瞬态、温度等特性。在Typical工艺角情况下,负载电流以100 mA/1μs突变时,输出电压突变量最大为89 mV。重载与轻载模式下电压差也仅为16.8 mV,在两种极端工艺角条件下,输出电压突变量最大108 mV。此LDO无片外电容,整个片内补偿电容仅为4 pF,3 dB带宽为4068 Hz,0 dB带宽高达52 MHz。%A capacitor-less low-dropout regulator( LDO) is proposed with improved fast transient response and high open loop gian and wide band width(WB),the input voltage range is 2.8 V~5.0 V,the output voltage is 2.4 V. The characteristic of direct current,alternating current,transient and temperature simulation and verification by HSPICE. The maximum voltage step is about 89 mV at a load step of 100 mA/1μs under typical craft condition. The voltage differential is just about 16.8 mV in the heavy load and light load respectively. The maximum voltage step is about 108mV in the two extreme case. The 3 dB band width is 4 068 Hz and the 0 dB band width is 52 MHz for the whole chip compensation capacitor just of 4 pF,and without output capacitor.