A high efficiency CMOS DC-DC boost converter with current sensing feedback

This paper presents a high efficiency CMOS DC-DC boost converter with current sensing feedback. The internal 500 kHz oscillator for switching operation is used to make set control signal in pulse-width modulation topology. To sense the amount of current through the inductor, the high accuracy current copy circuit using operational amplifier is included. The load regulation is 11.5%/A with compensation scheme that increases the feedback loop gain and accuracy of the output voltage. To guarantee the stability of the converter, the artificial ramp signal is used. The measurement results show that the efficiency is up to 90.7% with 2.2 V input and 220 mA load current for 3.3V output. This converter is fabricated in 0.18-mum CMOS standard technology with thick gate oxide option

[1]  Chi-Ying Tsui,et al.  An integrated one-cycle control buck converter with adaptive output and dual loops for output error correction , 2004 .

[2]  J. B. Klaassens,et al.  PWM-switch modeling of DC-DC converters , 1995 .

[3]  G.A. Rincon-Mora,et al.  A low voltage, dynamic, noninverting, synchronous buck-boost converter for portable applications , 2004, IEEE Transactions on Power Electronics.

[4]  P.K.T. Mok,et al.  A monolithic current-mode CMOS DC-DC converter with on-chip current-sensing technique , 2004, IEEE Journal of Solid-State Circuits.

[5]  B. Lehman,et al.  A design method for paralleling current mode controlled DC-DC converters , 2004, IEEE Transactions on Power Electronics.

[6]  Robert W. Erickson,et al.  DC-DC converter design for battery-operated systems , 1995, Proceedings of PESC '95 - Power Electronics Specialist Conference.

[7]  S. V. Mollov,et al.  Modelling and control of DC-DC converters , 1998 .

[8]  Richard B. Fair,et al.  Special Issue on Biomedical Applications for MEMS and Microfluidics , 2004, Proc. IEEE.

[9]  A.P. Chandrakasan,et al.  Ultra low power control circuits for PWM converters , 1997, PESC97. Record 28th Annual IEEE Power Electronics Specialists Conference. Formerly Power Conditioning Specialists Conference 1970-71. Power Processing and Electronic Specialists Conference 1972.