Title :
A high power density 1.75 mm2 fully integrated closed-loop buck converter with varactor control scheme
Author :
Upadhyaya, Prabal ; Shi, Nan ; Bradburn, Sean ; Hess, Herbert L.
Author_Institution :
Microelectron. Res. & Commun. Inst., Univ. of Idaho, Moscow, ID
Abstract :
A high power density fully integrated DC-DC power converter is realized with improved quality factor on-chip inductor and high frequency switching. The power converter output voltage change is non-linear with Pulse Width Modulation (PWM) at high frequencies, hence a new control scheme with a varactor to adjust output voltage has been proposed in the paper. Detailed analysis of the design and simulation of a 1.75 mm2 fully integrated closed-loop buck converter in TSMC 0.25 mum technology is presented. The power converter takes a 3.3 V DC input and switches at 1.0 GHz to produce an output voltage of 1.5 V supplying 45 mW of power, giving a power density figure of 25.71 kW/m2. The proposed closed-loop DC-DC converter settles in less than 600 ns.
Keywords :
DC-DC power convertors; PWM power convertors; inductors; switching convertors; varactors; DC-DC power converter; TSMC; frequency 1 GHz; fully integrated closed- loop buck converter; high frequency switching; on-chip inductor; power 45 mW; pulse width modulation; quality factor; size 0.25 mum; varactor control scheme; voltage 1.5 V; voltage 3.3 V; Analytical models; Buck converters; DC-DC power converters; Frequency conversion; Inductors; Pulse width modulation; Pulse width modulation converters; Q factor; Varactors; Voltage control;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2008. APEC 2008. Twenty-Third Annual IEEE
Conference_Location :
Austin, TX
Print_ISBN :
978-1-4244-1873-2
Electronic_ISBN :
1048-2334
DOI :
10.1109/APEC.2008.4522696
