300mA adjustable LDO with 10µA ground current

Abstract

This paper presents an adjustable 300mA CMOS LDO built in a double-metal 0.5µm 16V CMOS technology. It uses a low-current bandgap which needs only 1.5µA. It includes a symmetrical op amp configured as voltage follower, having a built-in adaptive bias behavior. The circuit consumes 10µA without load, less than 40 µA at full load, and uses a 1.25V voltage reference. Dropout voltage at 300mA is typical 200mV. Input voltage range is 2.3V to 7V.