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

Abstract

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 23.5 mV when the load current ILOAD is stepped from 0 to 100 mA in 100 ns with a load capacitance of 100 pF, and the settling time is 1.2 μs. The proposed OCL-LDO consumes a quiescent current of 30 μA and has a dropout voltage of 200 mV for the maximum output current of 100 mA.

A Capacitorless LDO Regulator with Fast Feedback Loop and Damping-Factor-Control Frequency Compensation

“…This OCL-LDO adopts a three-stage structure [26][27][28]. Figure 2 shows the circuit implementation of the proposed OCL-LDO.…”

A 0.6 VIN 100 mV Dropout Capacitor-Less LDO with 220 nA IQ for Energy Harvesting System

“…For the purpose of improving the integration and reducing the cost, [ 10 , 11 , 12 , 13 ] proposed the output-capacitor-less (OCL) LDOs consuming A-level static currents. However, low-power equipment should consume as little electricity as possible during standby and operation.…”

“…Consequently, new challenges and requirements are set forth for the supply voltage and power conversion efficiency of LDO. For the purpose of improving the integration and reducing the cost, [10][11][12][13] proposed the output-capacitor-less (OCL) LDOs consuming µA-level static currents. However, lowpower equipment should consume as little electricity as possible during standby and operation.…”