Title :
Adaptive non-inverting buck-boost IC with on-chip sigma-delta ADC for portable applications
Author :
Paul, Rajarshi ; Corradini, Luca ; Maksimovic, Dragan
Author_Institution :
Nat. Semicond. Corp., Federal Way, WA, USA
Abstract :
This paper focuses on a mixed-signal IC realization of a digitally controlled power converter which steps up/down from 2.7-5.5 V to 1-3.6 V for battery powered portable applications. In particular, in this work a Σ-Δ modulated digital pulse-width modulator is combined with a low power second-order multi-bit Σ-Δ ADC in a 0.5 μm CMOS process. It is shown that precise output voltage positioning in buck, boost and buck/boost transition modes can be achieved. The quiescent current consumption of the IC is 700 μA. Experimentally observed efficiency of the converter is reported for 30 mA-360 mA load current with peak efficiency of 94%.
Keywords :
CMOS integrated circuits; PWM power convertors; digital control; microprocessor chips; mixed analogue-digital integrated circuits; sigma-delta modulation; CMOS process; adaptive noninverting integrated circuit; battery powered portable applications; buck-boost integrated circuit; current 700 muA; digital control; digital pulse width modulator; mixed-signal integrated circuit; on-chip sigma-delta ADC; power converter; sigma-delta modulation; size 0.5 mum; Converters; Integrated circuits; Modulation; Noise; Steady-state; Transient analysis; Voltage control; DC-DC converter; Non-inverting buck-boost power converter; Sigma-delta modulator; analog-digital converter; integrated chip;
Conference_Titel :
Control and Modeling for Power Electronics (COMPEL), 2010 IEEE 12th Workshop on
Conference_Location :
Boulder, CO
Print_ISBN :
978-1-4244-7462-2
Electronic_ISBN :
978-1-4244-7461-5
DOI :
10.1109/COMPEL.2010.5562441
