Ultra low power control circuits for PWM converters

Low voltage high-efficiency DC-DC conversion circuits are integral components of battery operated portable systems. This paper presents the design of a pulse width modulated (PWM) controller for a milliwatt level DC-DC converter. Low power control circuitry is constructed by utilizing a delay line based PWM generator and low-resolution feedback. A DC-DC converter has been fabricated which delivers 5 mW at 1 V, while achieving an efficiency of 88%. The PWM consumes only 10 /spl mu/W.

[1]  Robert W. Brodersen,et al.  A low-voltage CMOS DC-DC converter for a portable battery-operated system , 1994, Proceedings of 1994 Power Electronics Specialist Conference - PESC'94.

[2]  F. Gardner,et al.  Charge-Pump Phase-Lock Loops , 1980, IEEE Trans. Commun..

[3]  Gu-Yeon Wei,et al.  A low power switching power supply for self-clocked systems , 1996, ISLPED '96.

[4]  Mark Horowitz,et al.  A low power switching power supply for self-clocked systems , 1996, Proceedings of 1996 International Symposium on Low Power Electronics and Design.

[5]  Paul R. Gray,et al.  A 10-bit, 20-MS/s, 35-mW pipeline A/D converter , 1994, Proceedings of IEEE Custom Integrated Circuits Conference - CICC '94.

[6]  V. von Kaenel,et al.  A voltage reduction technique for battery-operated systems , 1990 .

[7]  Anantha P. Chandrakasan,et al.  Low Power Digital CMOS Design , 1995 .

[8]  Teresa H. Meng,et al.  A 1.2 mW video-rate 2-D color subband decoder , 1995 .

[9]  A. Chandrakasan,et al.  An efficient controller for variable supply-voltage low power processing , 1996, 1996 Symposium on VLSI Circuits. Digest of Technical Papers.