250mA ultra low drop out regulator with high slew rate double recycling folded cascode error amplifier

S. Patri, S. Alapati, S. Chowdary, K. Prasad
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引用次数: 7

Abstract

This paper presents a modified folded cascode error amplifier of low dropout (LDO) regulator and a compensation scheme to improve the transient response. The proposed error amplifier enhances its transconductance, gain, and slew rate by recycling the shunt current sources of conventional folded cascode amplifier without increasing area or power consumption. The design is implemented in a standard UMC 0.18μm CMOS process. The LDO regulator consumes a quiescent current of 34μAonly. Simulation results show that the overshoot/undershoot in the output voltage under the extreme load transients are 177.7mV/139mVfor load current range of 0.5mA to 250mA with an output capacitor of 1pF. The LDO presented is useful for chip level power management suitable for SoC applications.
250mA超低差调节器,高摆压率双循环折叠级联误差放大器
本文提出了一种改进的低差(LDO)稳压器的折叠级联误差放大器和一种改善暂态响应的补偿方案。该误差放大器通过回收传统折叠级联放大器的分流电流源,在不增加面积和功耗的情况下提高其跨导性、增益和摆压率。该设计采用标准UMC 0.18μm CMOS工艺实现。LDO稳压器仅消耗34μ a的静态电流。仿真结果表明,当负载电流范围为0.5mA ~ 250mA,输出电容为1pF时,极端负载瞬态下输出电压超调/欠调为177.7mV/ 139mv。所提出的LDO对于适合SoC应用的芯片级电源管理非常有用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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