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1. (WO2018100375) VOLTAGE REGULATOR

Pub. No.:    WO/2018/100375    International Application No.:    PCT/GB2017/053608
Publication Date: Fri Jun 08 01:59:59 CEST 2018 International Filing Date: Fri Dec 01 00:59:59 CET 2017
IPC: G05F 1/575
Applicants: NORDIC SEMICONDUCTOR ASA
SAMUELS, Adrian James
Inventors: DOOGHABADI, Malihe Zarre
HALLIKAINEN, Samuli
Title: VOLTAGE REGULATOR
Abstract:
A low-dropout voltage regulator (2) is arranged to convert an input voltage to an output voltage. The low-dropout voltage regulator comprises: an error amplifier circuit portion (4) arranged to produce an error signal proportional to a difference between a sense voltage (Vsense) and a reference voltage (Vref), wherein the sense voltage is derived from the output voltage; a pass field-effect-transistor (MP) connected to the input voltage; and a rail-to-rail buffer circuit portion (6) connected between the input voltage (VDD) and ground. The rail-to-rail buffer circuit portion comprises: a buffer input arranged to receive the error signal; a buffer output arranged to apply a buffer signal to the gate terminal of the pass field-effect-transistor, wherein the buffer signal is a buffered version of the error signal; and a resistive bypass arrangement (Rbypass) connected between the buffer input and the buffer output.