Conference paper
A 0.35μm 50V CMOS Sliding-Mode Control IC for Buck Converters
Automation, Department of Electrical Engineering, Technical University of Denmark1
Department of Electrical Engineering, Technical University of Denmark2
Electronics & Signal Processing, Department of Electrical Engineering, Technical University of Denmark3
Centre for Physical Electronics, Centers, Technical University of Denmark4
This paper presents a hysteretic (sliding mode) control IC for a buck DC/DC converter for use as an envelope tracking power supply to increase the efficiency of an RF power amplifier. The IC integrates a high-bandwidth error amplifier, a comparator with hysteresis, and a high-side driver for an external N-channel power MOSFET.
The total control loop delay using the implemented IC is 35ns, this is shown to be a 30% reduction compared to a state-of-the-art discrete IC based solution. The presented results also show that it is viable to integrate a 100MHz operational amplifier on the same die as a high-voltage MOSFET driver operating with slew rates in excess of 5V/ns.
The IC is demonstrated in a tracking power supply with 30W output power and 3μs rise/fall time, running from a 40V input. The complete IC, including pads, takes up 4mm2 in a 0.35μm 50V CMOS process.
| Language: | English |
|---|---|
| Year: | 2007 |
| Pages: | 182-185 |
| Proceedings: | 33rd European Solid-State Circuits Conference |
| ISBN: | 1424411254 and 9781424411252 |
| ISSN: | 26431319 and 19308833 |
| Types: | Conference paper |
| DOI: | 10.1109/ESSCIRC.2007.4430275 |
| ORCIDs: | Andersen, Michael Andreas E. |
Buck converters CMOS integrated circuits CMOS process CMOS sliding-mode control IC DC-DC power convertors Driver circuits Hysteresis MOSFET circuits Power amplifiers Power supplies RF power amplifier Radiofrequency amplifiers Radiofrequency integrated circuits Sliding mode control buck DC/DC converter buck converters comparator comparators (circuits) driver circuits envelope tracking power supply external N-channel power MOSFET frequency 100 MHz high-bandwidth error amplifier high-side driver high-voltage MOSFET driver hysteretic control IC operational amplifier operational amplifiers power 30 W power amplifiers radiofrequency amplifiers size 0.35 mum time 3 mus time 35 ns total control loop delay variable structure systems voltage 40 V voltage 50 V
