Title :
A low dropout voltage regulator with programmable output
Author :
Wu, Ying-Cheng ; Huang, Chun-Yueh ; Liu, Bin-Da
Author_Institution :
Dept. of Electron. Eng., Nat. Univ. of Tainan, Tainan, Taiwan
Abstract :
In this paper, we present a low dropout voltage regulator (LDO) which can be programmed to generate four output voltages (3.3 V, 2.5 V, 1.8 V, and 0 V) by the external control signals. Between the error amplifier and the power transistor, we place a simple buffer so that the power supply rejection (PSR) of LDO can be improved. The design specification of the maximum load current is 100 mA. The proposed LDO is designed by the 0.35 mum CMOS 2P4M process technology and simulated by HSPICE. Simulation results show that the maximum transient-output variation (overshoot voltage) is about 50 mV with full-load step change of 100 mA and the PSR is larger than 60 dB for different output voltages. Therefore, the proposed LDO can be applied for power management systems in system-on-chip (SOC), where the output voltage can be changed by control logic to optimize the power consumption of supplied device.
Keywords :
CMOS integrated circuits; system-on-chip; voltage regulators; CMOS process; HSPICE simulation; current 100 mA; error amplifier; low dropout voltage regulator; power management systems; power supply rejection; power transistor; size 0.35 mum; system-on-chip; voltage 0 V to 3.3 V; CMOS process; CMOS technology; Energy management; Low voltage; Power amplifiers; Power supplies; Power transistors; Regulators; Signal generators; Voltage control; dc-dc convertor; low dropout liner regulator;
Conference_Titel :
Industrial Electronics and Applications, 2009. ICIEA 2009. 4th IEEE Conference on
Conference_Location :
Xi´an
Print_ISBN :
978-1-4244-2799-4
Electronic_ISBN :
978-1-4244-2800-7
DOI :
10.1109/ICIEA.2009.5138825
