ABSTRACT

The external capacitors of conventional LDO (Low Drop Out) regulator have a function to improve the transient response characteristics affected by the overshoot and undershoot. However, the LDO regulator proposed in this study is replaced the function of the external output capacitor with a dual push-pull stage and is achieved a fast transient response by a newly added control path to replace the function of the capacitor removed along with the existing feedback path. The proposed LDO regulator can also be provided the improved ESD (Electro Static Discharge) robustness characteristics by applying the SCR (Silicon Control Rectifier)-based ESD (Electro Static Discharge) protection device embedded into the output node and power line. The LDO regulator with dual push-pull circuit proposed in this study was operated at a maximum load current of 100 mA, an output voltage of 3 V, and an input voltage range of 3.3 ~ 4.5 V. As a result of the measurement, an undershoot voltage of 110 mV and an overshoot voltage of 123 mV were maintained when a load current of 100 mA was applied. Further, the ESD robustness characteristic of HBM is guaranteed at 8kV or higher.

摘要

传统LDO（低压差）稳压器的外部电容器具有改善受过冲和下冲影响的瞬态响应特性的功能。然而，本研究中提出的LDO稳压器用双推挽级取代了外部输出电容器的功能，并通过新添加的控制路径来取代与现有电路一起移除的电容器的功能，从而实现快速瞬态响应。反馈路径。通过应用嵌入输出节点和电源线的基于 SCR（硅控整流器）的 ESD（静电放电）保护器件，所提出的 LDO 稳压器还可以提供改进的 ESD（静电放电）鲁棒性特性。本研究中提出的具有双推挽电路的 LDO 稳压器在最大负载电流 100 mA 下运行，输出电压为3V，输入电压范围为3.3～4.5V。测量结果是，当施加100mA的负载电流时，保持了110mV的下冲电压和123mV的过冲电压。此外，HBM的ESD鲁棒性特性在8kV或更高时得到保证。