A Current-mode, Boost DC/DC Converter for Small Inductances

Conference: ANALOG '06 - 9. ITG/GMM-Fachtagung
09/27/2006 - 09/29/2006 at Dresden, Germany

Proceedings: ANALOG '06

Pages: 6Language: englishTyp: PDF

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Jochmann, Sven (AMD Saxony, Dresden, Germany)

This paper presents a CMOS circuit for the on-chip generation of a high voltage using an optimized design of a step-up DC/DC converter with inductor values in the <1 microH range. The work had the objective to replace commonly used charge-pumps with an inductor-based solution of higher power efficiency. The physical dimensions of the inductor were limited to be suitable for integration into low-height, standard IC-packages (e.g. BGAs). The described DC/DC converter is based on a current-mode, oscillator-stabilized boost architecture. The circuit generates an output voltage of 6V from an 1.8V input source and achieves a simulated efficiency of 60% for a 12mA current load with an 150nH inductor. The active die size without pads is 0.5mm2 in a 0.25micrometer CMOS process.