Paper Info
Title
A green-switch controller IC for cascade buck-boost converter with seamless transition over entire input and load range
Abstract
To raise the utilization ratio of lithium-ion battery in portable devices, a novel green-switch controller IC is proposed to constitute a 4-switch cascade buck-boost prototype, which is capable of outputting non-inverting step down and step up voltages. According to the relations between the input and output voltages through duty ratio, a finite state machine automatically determines the work method of converter namely buck method, boost method or transition method by combining peak and valley current programmed mode so as to improve the line regulation over the entire input voltage range. A three-phase seamless transition method is introduced into the controller. Its additional advantage is to lower output ripples. Furthermore, a special burst mode is added to reduce the power consumption during light-load operation. An elaborately designed circuitry and rigorous stability analysis further improves the seamless performance. The controller IC is designed and fabricated in 1.5@mm BCD (Bipolar-CMOS-DMOS) technology with an area of 8.75mm^2 and applied to a 2.7V-4.2V/3.3V, maximum output power 1.65W buck-boost converter. It features over 90% conversion efficiency during normal application and still remains over 80% under standby mode. The experimental results show that all functional and performance targets are successfully achieved as expected.
Year
DOI
Venue
2011
10.1016/j.mejo.2011.06.003
Microelectronics Journal
Keywords
Field
DocType
entire input,boost method,controller ic,transition method,novel green-switch controller ic,load range,work method,special burst mode,maximum output power,lower output ripple,three-phase seamless transition method,cascade buck-boost converter,output voltage,switch mode power supplies,power electronics,power system,finite state machine,stability analysis,boost converter,conversion efficiency,integrated circuit design
Boost converter,Control theory,Standby power,Duty cycle,Line regulation,Input/output,Electronic engineering,Engineering,Buck converter,Electrical engineering,Buck–boost converter
Journal
Volume
Issue
ISSN
42
10
0026-2692
Citations 
PageRank 
References 
0
0.34
3
Authors
4
Name
Order
Citations
PageRank
Jia-Na Lou110.77
Xiaobo Wu294.88
Menglian Zhao32211.35
Xiao-lang Yan422.07