Single-inductor multiple-output switching converters with time-multiplexing control in discontinuous conduction mode

• Published in: IEEE journal of solid-state circuits Vol. 38; no. 1; pp. 89 - 100
• Main Authors: Dongsheng Ma, Wing-Hung Ki, Chi-Ying Tsui, Mok, P.K.T.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.01.2003; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Circuits; CMOS; CMOS process; Control systems; Conversion; Converters; Electric potential; Frequency conversion; Inductors; Oscillators; Power conversion; Power generation; Stability analysis; Switching converters; Voltage; Voltage control
• ISSN: 0018-9200; 1558-173X
• DOI: 10.1109/JSSC.2002.806279

An integrated single-inductor dual-output boost converter is presented. This converter adopts time-multiplexing control in providing two independent supply voltages (3.0 and 3.6 V) using only one 1-/spl mu/H off-chip inductor and a single control loop. This converter is analyzed and compared with existing counterparts in the aspects of integration, architecture, control scheme, and system stability. Implementation of the power stage, the controller, and the peripheral functional blocks is discussed. The design was fabricated with a standard 0.5-/spl mu/m CMOS n-well process. At an oscillator frequency of 1 MHz, the power conversion efficiency reaches 88.4% at a total output power of 350 mW. This topology can be extended to have multiple outputs and can be applied to buck, flyback, and other kinds of converters.