A Multipath Output-Capacitor-Less LDO Regulator

Abstract

A multipath output-capacitor-less low-dropout (OCL-LDO) regulator with feedforward path compensation is presented to achieve low power consumption and fast transient response. The proposed OCL-LDO does not require output capacitance and remains stable at no-load(under 100nA) condition. The proposed OCL-LDO regulator has been implemented and fabricated in a $0.18\mu \text{m}$ CMOS process, it occupies an active area of 0.0128mm2. The proposed circuit consumes a quiescent current of $0.6\mu \text{A}$ at no load and $6.9\mu \text{A}$ at the maximum current load current. Regulating the output at 1V from a voltage supply of 1.2V. It achieves full range stability from 100nA to 100mA, and 100pF is the maximum tolerable parasitic capacitance at output. The measurement results show that the load current rises from 0 to 100mA in 100ns, the undershoot voltage is 388mV, and the settling time is $2.2\mu \text{s}$.