A Multiphase Synchronous Buck Converter With a Fully Integrated Current Balancing Scheme

Author

Yong-seong Roh ; Young-jin Moon ; Jeongpyo Park ; Min-Gyu Jeong ; Changsik Yoo

Author_Institution

Dept. of Electron. Eng., Hanyang Univ., Seoul, South Korea

Volume

30

Issue

9

fYear

2015

fDate

Sept. 2015

Firstpage

5159

Lastpage

5169

Abstract

A multiphase synchronous buck converter has been developed, in which the number of switching phases is determined by the sensed average load current. The maximum number of switching phases is four. The dc resistance (DCR) of switching inductor is used to detect the average current, which is also utilized to balance the load current among the multiple switching phases. The instantaneous inductor current is sensed as well to generate the pulsewidth modulation (PWM) signal to switch the inductors. The multiphase synchronous buck converter implemented in a 0.13-μm BCDMOS process shows 91.1% maximum power efficiency when the input voltage is 2.8 V, output voltage is 1.0 V, and output current is 2.0 A.

Keywords

BIMOS integrated circuits; PWM power convertors; inductors; BCDMOS process; DCR; PWM signal; dc resistance; fully integrated current balancing scheme; instantaneous inductor current; maximum power efficiency; multiphase synchronous buck converter; pulsewidth modulation signal; sensed average load current; switching inductor; switching phases; Capacitors; Inductors; Pulse width modulation; Sensors; Switches; Voltage control; BCDMOS; Multi-phase buck converter; current balancing; current sensor; inductor DC resistance; inductor dc resistance (DCR); multiphase buck converter;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2014.2368130

Filename

6949694