An Output-Capacitorless Low-Dropout Regulator with Slew-Rate Enhancement

A novel output-capacitorless low-dropout regulator (OCL-LDO) with an embedded slew-rate-enhancement (SRE) circuit is presented in this paper. The SRE circuit adopts a transient current-boost strategy to improve the slew rate at the gate of the power transistor when a large voltage spike at the output is detected. In addition, a feed-forward transconductance cell is introduced to form a push–pull output structure with the power transistor. The simulation results show that the maximum transient output voltage variation is [Formula: see text] when the load current [Formula: see text] is stepped from [Formula: see text] to [Formula: see text] in [Formula: see text] with a load capacitance of [Formula: see text] , and the settling time is [Formula: see text]. The proposed OCL-LDO consumes a quiescent current of [Formula: see text] and has a dropout voltage of [Formula: see text] for the maximum output current of [Formula: see text].