Title :
Frequency compensation scheme for LDO regulator operated under wide power supply range in smart battery system
Author :
Wang, Yongsheng ; Yu, Mingyan ; Feng, Xiaoxiong ; Lai, Fengchang
Author_Institution :
Micro-Electron. Dept., Harbin Inst. of Technol., Harbin, China
Abstract :
A low dropout (LDO) linear regulator suitable for wide power supply of 4.5~28V for smart battery system applications to generate a stable 1.8V output is presented in this paper. By utilizing pre-regulator to output a rough 3.3V as internal power supply, the proposed LDO provides less power dissipation and high stability. For the frequency compensation of the core regulator, some approaches like using output capacitor to set a dominant pole, utilizing a buffer stage to avoid generation of low-frequency pole, introducing an additional zero, are presented to stabilize the regulator loop for various load conditions and wide supply range. Besides, parasitic poles in high frequency can be compensated by feedforward compensation and mirror-pole compensation.
Keywords :
power supply circuits; buffer stage; core regulator; feedforward compensation; frequency compensation scheme; load conditions; mirror-pole compensation; output capacitor; parasitic poles; regulator loop; smart battery system applications; wide power supply range; Batteries; Capacitors; Poles and zeros; Power supplies; Regulators; Stability analysis; Voltage control; Frequency compensation; low dropout linear regulator; pre-regulator; smart battery system;
Conference_Titel :
Electron Devices and Solid-State Circuits (EDSSC), 2011 International Conference of
Conference_Location :
Tianjin
Print_ISBN :
978-1-4577-1998-1
Electronic_ISBN :
Pending
DOI :
10.1109/EDSSC.2011.6117715
