Journal
IEEE JOURNAL OF SOLID-STATE CIRCUITS
Volume 44, Issue 11, Pages 3131-3145Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2009.2033508
Keywords
Buck converter; CMOS; DC-DC converter; hysteretic; multiphase
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This paper reports a delay-locked loop (DLL) based hysteretic controller for high-frequency multiphase dc-dc buck converters. The DLL control loop employs the switching frequency of a hysteretic comparator as reference to automatically synchronize the remaining phases and eliminate the need for external synchronization. A dedicated duty cycle control loop is used to enable current sharing and ripple cancellation. We demonstrate a four-phase high-frequency buck converter that operates at 25-70 MHz with fast hysteretic control and output conversion range of 17.5%-80%. The converter achieves an efficiency of 83% at 2 W and 80% at 3.3 W. The circuit has been implemented in standard 0.5 mu m 5 V CMOS process.
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