Title :
A fully-integrated 130nm CMOS DC-DC step-down converter, regulated by a constant on/off-time control system
Author :
Wens, Mike ; Steyaert, Michiel
Author_Institution :
ESAT-MICAS, K.U. Leuven, Leuven
Abstract :
A fully-integrated DC-DC step-down converter in a 130 nm 1.2 V CMOS technology is realized, with an integrated metal-track inductor and integrated MOS and MIM capacitors. The converter is designed to generate an output voltage of 1.2 V out of a 2.6 V power supply. No external components are required. The maximum power conversion efficiency is 52%, for a voltage conversion ratio of 0.46. This is a 12% improvement compared to a linear regulator. Higher values are likely to be reached using a converter with external components, which is not the case here. Stacked transistors are used to cope with the high voltage. A novel control system based on a constant on/off-time keeps the output voltage constant at load conditions from 0 mW to 180 mW. The converter operates in discontinuous, asynchronous switching mode. The switching frequency ranges from 30 Hz to 300 MHz.
Keywords :
CMOS integrated circuits; DC-DC power convertors; MIM devices; MOS capacitors; low-power electronics; nanoelectronics; on-off control; switching convertors; asynchronous switching mode; constant on-off-time control system; efficiency 52 percent; frequency 30 Hz to 300 MHz; fully-integrated CMOS DC-DC step-down converter; integrated MIM capacitors; integrated MOS capacitors; integrated metal-track inductor; power 0 mW to 180 mW; power conversion efficiency; power supply; size 130 nm; stacked transistors; voltage 1.2 V; voltage 2.6 V; voltage conversion ratio; CMOS technology; Control systems; DC-DC power converters; Inductors; MIM capacitors; Power conversion; Power generation; Power supplies; Regulators; Voltage;
Conference_Titel :
Solid-State Circuits Conference, 2008. ESSCIRC 2008. 34th European
Conference_Location :
Edinburgh
Print_ISBN :
978-1-4244-2361-3
Electronic_ISBN :
1930-8833
DOI :
10.1109/ESSCIRC.2008.4681792
