Fully on-chip switched capacitor NMOS low dropout voltage regulator

Abstract

This paper presents a 1.5 V 50 mA low dropout voltage (LDO) regulator using an NMOS transistor as the output pass element. Continuous time operation of the LDO is achieved using a new switched floating capacitor scheme that raises the gate voltage of the pass element. The regulator has a 0.2 V dropout at a 50 mA load and is stable for a wide load current range with loading capacitances up to 50 pF. The output variation when a full load step is applied is 300 mV and the recovery time is below 0.3 ls. It is designed in a 0.13 lm CMOS process with an area of 0.008 mm 2 and its operation does not require any external component.