Full Text:   <5106>

CLC number: TN4; TN86

On-line Access: 

Received: 2009-03-19

Revision Accepted: 2009-06-12

Crosschecked: 2009-06-17

Cited: 6

Clicked: 6563

Citations:  Bibtex RefMan EndNote GB/T7714

-   Go to

Article info.
1. Reference List
Open peer comments

Journal of Zhejiang University SCIENCE A 2009 Vol.10 No.8 P.1223-1230


On-chip boost regulator with projected off- and on-time control

Author(s):  Xiao-ru XU, Meng-lian ZHAO, Xiao-bo WU

Affiliation(s):  Institute of VLSI Design, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   zhaoml@vlsi.zju.edu.cn

Key Words:  Boost regulator, Integrated circuits, Pulse frequency modulation, Projected off-time, Projected on-time

Share this article to: More <<< Previous Article|

Xiao-ru XU, Meng-lian ZHAO, Xiao-bo WU. On-chip boost regulator with projected off- and on-time control[J]. Journal of Zhejiang University Science A, 2009, 10(8): 1223-1230.

@article{title="On-chip boost regulator with projected off- and on-time control",
author="Xiao-ru XU, Meng-lian ZHAO, Xiao-bo WU",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T On-chip boost regulator with projected off- and on-time control
%A Xiao-ru XU
%A Meng-lian ZHAO
%A Xiao-bo WU
%J Journal of Zhejiang University SCIENCE A
%V 10
%N 8
%P 1223-1230
%@ 1673-565X
%D 2009
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A0920160

T1 - On-chip boost regulator with projected off- and on-time control
A1 - Xiao-ru XU
A1 - Meng-lian ZHAO
A1 - Xiao-bo WU
J0 - Journal of Zhejiang University Science A
VL - 10
IS - 8
SP - 1223
EP - 1230
%@ 1673-565X
Y1 - 2009
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A0920160

The boost type power supplies are widely used in portable consumer electronics to step up the input voltage to adapt for the high voltage applications like light-emitting diode (LED) driving and liquid crystal display (LCD) biasing. In these applications, a regulator with small volume, fewer external components and high efficiency is highly desired. This paper proposes a projected off- and on-time boost control scheme, based on which a monolithic IC with an on-chip VDMOS with 0.2 Ω on-state resistance RDS-ON was implemented in 1.5 μm bipolar-CMOS-DMOS (BCD) process. A 12 V, 0.3 A boost regulator prototype is presented as well. With projected off-time and modulated on-time in continuous conduction mode (CCM), a quasi fixed frequency, which is preferred for ripple control, is realized. With projected on-time and modulated off-time in discontinuous conduction mode (DCM), pulse frequency modulation (PFM) operation, which is beneficial to light load efficiency improvement, is achieved without extra control circuitry. Measurement results show that an efficiency of 3% higher than that of a conventional method under 0.5 W output is achieved while a step load transient response comparable to that of current mode control is maintained as well.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


[1] Cardoso, B.J., Moreira, A.F., Menezes, B.R., Cortizo, P.C., 1992. Analysis of Switching Frequency Reduction Methods Applied to Sliding Mode Controlled DC-DC Converters. Proc. IEEE Applied Power Electronics Conf. and Expo, p.403-410.

[2] Chen, H., Zhao, M.L., Wu, X.B., Yan, X.L., 2008. Multi-mode controller IC for soft-switched flyback converter with high efficiency over the entire load range. J. Zhejiang Univ. Sci. A, 9(10):1411-1419.

[3] Chen, H.M., Chang, R.C., Huang, C.L., 2007. Low-voltage Zero Quiescent Current PFM Boost Converter for Portable Devices. IEEE Int. SOC Conf., p.177-180.

[4] Deisch, C.W., 1978. Simple Switch Control Method Changes Power Converter into a Current Source. Proc. IEEE Power Electronics Specialists Conf., p.300-306.

[5] Deng, H.F., Duan, X.M., Sun, N., Huang, A.Q., Chen, D., 2005. Monolithically integrated boost converter based on 0.5-μm CMOS process. IEEE Trans. Power Electr., 20(3):628-638.

[6] Erickson, R.W., Maksimovic, D., 2001. Fundamentals of Power Electronics (2nd Ed.). Kluwer Academic Publishers, Norwell, Massachusetts, p.193-302, 439-454.

[7] Ferguson, B.R., 2006. Dual-mode PFM Boost Converter. US Patent, 7 102 340.

[8] Grant, D., 2002. Frequency Control of Hysteretic Power Converter by Adjusting Hysteresis Levels. US Patent, 6 348 780.

[9] Keskar, N.A., Rincon-Mora, G.A., 2008. A fast, sigma-delta (ΣΔ) boost DC-DC converter tolerant to wide LC filter variations. IEEE Trans. Circuits-II: Expr. Briefs, 55(2):198-202.

[10] Ling, H.S., 2007. Apparatus and Method for Flywheel Current Injection for a Regulator. US Patent, 7 221 134.

[11] LM3488 Datasheet, 2009. National Semiconductor. Available from: http://www.national.com/ds/LM/LM3488.pdf [Accessed 18/03/09].

[12] Nabeshima, T., Sato, T., Nishijima, K., Yoshida, S., 2005. A Novel Control Method of Boost and Buck-boost Converters with a Hysteretic PWM Controller. Proc. IEEE European Conf. on Power Electronics and Application, p.1-6.

[13] Redl, R., Sokal, N.O., 1986. Frequency Stabilization and Synchronization of Free-running Current-mode-controlled Converters. Proc. IEEE Power Electronics Specialists Conf., p.519-530.

[14] Ridley, R.B., 1990. A New Continuous-time Model for Current-mode Control with Constant Frequency, Constant On-time, and Constant Off-time, in CCM and DCM. 21st Annual IEEE Conf. on Power Electronics Specialists, p.382-389.

[15] Sable, D.M., Cho, B.H., Ridley, R.B., 1990. Elimination of the Positive Zero in Fixed Freqeuncy Boost and Flyback Converters. Fifth Annual Proc. on Applied Power Electronics Conf. and Exposition, p.205-211.

[16] Tan, S.C., Lai, Y.M., Tse, C.K., 2008. General design issues of sliding-mode controllers in DC-DC converters. IEEE Trans. Ind. Electron., 55(3):1160-1174.

[17] Tso, C.H., Wu, J.C., 2003. A ripple control buck regulator with fixed output frequency. IEEE Power Electron. Lett., 1(3):61-63.

[18] Xu, X.R., Wu, X.B., Yan, X.L., 2008. A Quasi Fixed Frequency Constant on Time Controlled Boost Converter. Proc. IEEE Int. Symp. on Circuits and Systems, p.2206-2209.

Open peer comments: Debate/Discuss/Question/Opinion


Please provide your name, email address and a comment

Journal of Zhejiang University-SCIENCE, 38 Zheda Road, Hangzhou 310027, China
Tel: +86-571-87952783; E-mail: cjzhang@zju.edu.cn
Copyright © 2000 - 2024 Journal of Zhejiang University-SCIENCE