一种超低过冲电压的低功耗LDO电路设计OA

Based on the 0.18 μm BCD process,a low-power low-dropout linear regulator(LDO)circuit is designed and implemented.To address the significant output voltage overshoot issue during rapid power-on after shutdown,an optimization method is proposed.On the basis of the LDO input-stage structure,a startup circuit module is added to generate a startup signal.When the chip powers on,the startup circuit produces a high-level pulse signal,turning on the startup transistor,increasing the tail current of the operational amplifier,thereby enhancing its response speed and reducing output overshoot.Experimental results show that this method reduces the output overshoot from 3.406 V to about 0.297 V,effectively mitigating the output voltage overshoot and significantly improving the transient response performance and overall reliability of the LDO circuit.