A 0.18-mu m CMOS, 91%-Efficiency, 2-A Scalable Buck-Boost DC-DC Converter for LED Drivers

作者：Malcovati Piero^*; Belloni Massimiliano; Gozzini Fabio; Bazzani Cristiano; Baschirotto Andrea

来源：IEEE Transactions on Power Electronics, 2014, 29(10): 5392-5398.

DOI：10.1109/TPEL.2013.2294189

• Analog integrated circuits
• CMOS integrated circuits
• dc-dc power converters

This paper presents a buck-boost dc-dc converter for LED drivers capable of delivering an output current ranging from 0.1to 2 A and a variable output voltage ranging between 2 and 5 V, starting from an input voltage spanning from 2.7 to 5.5 V. The dc-dc converter, realized in a 0.18-mu m CMOS technology with 5-V option, occupies an area of 4 mm(2) including pads. The circuit features automaticmode switching and dynamic sizing of the power transistors to achieve a peak efficiency of 91%. With a switching frequency of 2.5 MHz, the achieved line regulation is lower than 0.1% V-1 and the output voltage ripple is less than 10 mV. The obtained turn-on and load transient settling time are lower than 40 mu s, thus allowing pulsed operation of the LEDs, as well as switching among LEDs of different colors.

• 出版日期2014-10