Title :
An integrated step-down DC-DC converter with low output voltage ripple
Author :
Lee, Yi-Ting ; Wei, Chia-Ling ; Chen, Chin-Hong
Author_Institution :
Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan
Abstract :
An integrated low-output-ripple step-down DC-DC converter, which cascades a Buck converter with a low-dropout regulator (LDO), is presented. The output of the Buck converter can be used to supply digital circuits, while the LDO output is used to power analog circuits. The designed Buck converter can adaptively and automatically switch between the pulse-width modulation (PWM) and pulse-frequency modulation (PFM) to improve the conversion efficiency over the whole load current range. The chip was implemented by TSMC 0.35μm 2P4M polycide CMOS process. The measured maximal load current of the Buck converter was 280 mA, and the measured LDO maximal load current was 100 mA.
Keywords :
CMOS analogue integrated circuits; DC-DC power convertors; low-power electronics; pulse frequency modulation; pulse width modulation; LDO output; analog circuit; buck converter; conversion efficiency; current 100 mA; current 280 mA; digital circuit; integrated low-output-ripple step-down DC-DC converter; load current range; low output voltage ripple; low-dropout regulator; polycide CMOS process; pulse-frequency modulation; pulse-width modulation; size 0.35 mum; Buck converters; Current measurement; DC-DC power converters; Digital circuits; Low voltage; Pulse width modulation; Pulse width modulation converters; Regulators; Semiconductor device measurement; Switches; Buck converter; DC-DC converter; LDO; step-down; switching regulator;
Conference_Titel :
Industrial Electronics and Applications (ICIEA), 2010 the 5th IEEE Conference on
Conference_Location :
Taichung
Print_ISBN :
978-1-4244-5045-9
Electronic_ISBN :
978-1-4244-5046-6
DOI :
10.1109/ICIEA.2010.5514889
