http://iet.metastore.ingenta.com
1887

Dual-phase DC–DC buck converter with light-load performance enhancement for portable applications

Dual-phase DC–DC buck converter with light-load performance enhancement for portable applications

For access to this article, please select a purchase option:

Buy article PDF
£12.50
(plus tax if applicable)
Buy Knowledge Pack
10 articles for £75.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend to library

You must fill out fields marked with: *

Librarian details
Name:*
Email:*
Your details
Name:*
Email:*
Department:*
Why are you recommending this title?
Select reason:
 
 
 
 
 
IET Power Electronics — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

In modern portable devices, except during short periods of busy time, application processors work at low-power state most of the time to prolong battery life. Thus, high efficiency and low consumption are essential for their power management under light-load conditions. This study presents a dual-phase DC–DC buck converter with light-load performance enhancement for power supply. As load decreases, the converter could transfer the adaptive-on-time-based control strategy from pulse-width modulation to pulse-frequency modulation to enhance efficiency. An extra power-save mode is introduced into design to minimise the power consumption at extremely light load. Besides, a novel current-balance circuit with additional offset elimination block is implemented, which results in equal distribution of load current between phases over wide load range. Moreover, instead of a conventional high precision and fast response comparator, a simple comparator with self-calibration is used in zero-current switching circuit to reduce design complexity, as well as to improve light-load efficiency. The converter is fabricated in 0.18-μm Globalfoundry CMOS process. Experimental results show that91% peak efficiency and 6 µA standby quiescent current is achieved. With the aid of mode switching, current-balance and zero-current switching, the light-load performance enhancement is verified by measurements.

http://iet.metastore.ingenta.com/content/journals/10.1049/iet-pel.2017.0510
Loading

Related content

content/journals/10.1049/iet-pel.2017.0510
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Loading
This is a required field
Please enter a valid email address