A Fully Integrated Circuit for High Current Multiple-Output

Abstract

This paper presents a fully integrated circuit for high current multiple-output that can independently control supply voltage of several circuit building blocks. This work combines digital-to-analog converters (DACs) and low dropout regulators (LDOs) to offer a high output voltage resolution and a high output current capability. A resistor-floating-resistor-string DACs achieves a 10-bit resolution with a small silicon area. A multi-stage LDO removes voltage offsets with high loop gain and improves transient responses with high gain-bandwidth product. A test chip fabricated in a 0.18μm CMOS process achieves an output voltage range of 0.6 V to 1.3 V, maximum output current of 5 mA, voltage regulation accuracy of 0.7 mV with 1.8V VDD.