Battery Power - March/April 2013 - (Page 21)
ICs & Semiconductors
Lithium-Ion Battery Charge Controller IC with Support
For Large-Current Rapid Charging
Renesas Electronics Corp. has developed of the
R2A20057BM Li-Ion battery charge controller IC for mobile
devices employing one
cell Li-Ion batteries, such
as digital still cameras
and smartphones. The
R2A20057BM integrates
a step-down DC-DC converter and supports 2 A
large-current charging in
very small package in the
world’s smallest class.
As digital still cameras, smartphones and
other mobile devices gain
higher levels of functionality, their current
usage increases, requiring
bigger capacity of Li-Ion
batteries, and larger currents for charging these batteries. However, systems for large-current charging employ multiple power
metal-oxide-semiconductor field-effect transistors (MOSFETs)
and discrete passive components, and large-scale heat emission
structure under large-current handling, while they need mount-
www.BatteryPowerOnline.com
ing area compactness especially for mobile devices.
To solve these problems, the R2A20057BM reduces the
mounting area by integrating multiple power MOSFETs and
charging circuits in a single chip, using a wafer-level package,
a packaging technology that can also supply large amounts of
current due to reduced package resistance. In addition, it incorporates a highly efficient on-chip step-down DC-DC converter
to realize large-current charging while keeping heat generation
to a minimum.
The use of a very finer high-voltage-tolerance wafer process
and wafer-level package allows Renesas to achieve a compact
chip size in the world’s smallest class of 2.47 mm by 2.47 mm.
In addition, the integrated 2 MHz high-frequency step-down
DC-DC converter enables a use of compact multi-layer-chip
inductors as the external devices. The 25 V on-chip, high-input
voltage-tolerance enables a built-in overvoltage protection
circuit and eliminates an external overvoltage protection circuit,
contributing to a substantial reduction in the mounting area.
The R2A20057BM automatically identifies six USB port
types including the three types stipulated in the USB Battery
Charging Specification, Revision 1.2, and sets the input current
limit value automatically.
March/April 2013 • Battery Power
21
http://www.batterypoweronline.com
http://www.batterypoweronline.com/main/subscribe/
http://www.batterypoweronline.com
http://www.BatteryPowerOnline.com
Table of Contents for the Digital Edition of Battery Power - March/April 2013
Battery Power - March/April 2013
Contents
Editor's Choice
GTS and RGIS Launch Battery Test & Replace Service for Mobile Devices
Leyden Energy Raises $10 Million for Commercialization of Silicon Anode Mobile Pouch Cells and Automotive Start-Stop Batteries
Features
Circuit Protection Approach for High-Rate Discharge Li-Ion Battery Application
Battery Power 2013 Conference Preview
Simplify Peripheral Connectivity and Extend Battery Life in Mobile Applications
Managing Lithium-Chemistry Batteries: It’s Mostly
About Their Temperature
Lead Acid Batteries: A Proven Technology Marches
Forward
New Products
Batteries
Components
Charging & Testing
Power Supplies & Conversion
ICs & Semiconductors
Departments
Industry New
Marketplace
Battery Power - March/April 2013
https://www.nxtbook.com/nxtbooks/webcom/batterypower_2017spring
https://www.nxtbook.com/nxtbooks/webcom/batterypower_2016winter
https://www.nxtbook.com/nxtbooks/webcom/batterypower_2016fall
https://www.nxtbook.com/nxtbooks/webcom/batterypower_2016summer
https://www.nxtbook.com/nxtbooks/webcom/batterypower_2016spring
https://www.nxtbook.com/nxtbooks/webcom/batterypower_2015winter
https://www.nxtbook.com/nxtbooks/webcom/batterypower_2015fall
https://www.nxtbook.com/nxtbooks/webcom/batterypower_2015summer
https://www.nxtbook.com/nxtbooks/webcom/batterypower_2015spring
https://www.nxtbook.com/nxtbooks/webcom/batterypower_2014fall
https://www.nxtbook.com/nxtbooks/webcom/batterypower_2014summer
https://www.nxtbook.com/nxtbooks/webcom/batterypower_2014spring
https://www.nxtbook.com/nxtbooks/webcom/batterypower_2014winter
https://www.nxtbook.com/nxtbooks/webcom/batterypower_20131112
https://www.nxtbook.com/nxtbooks/webcom/batterypower_20130910
https://www.nxtbook.com/nxtbooks/webcom/batterypower_20130708
https://www.nxtbook.com/nxtbooks/webcom/batterypower_20130506
https://www.nxtbook.com/nxtbooks/webcom/batterypower_20130304
https://www.nxtbook.com/nxtbooks/webcom/batterypower_20130102
https://www.nxtbook.com/nxtbooks/webcom/batterypower_20121112
https://www.nxtbook.com/nxtbooks/webcom/batterypower_20120910
https://www.nxtbook.com/nxtbooks/webcom/batterypower_20120506
https://www.nxtbook.com/nxtbooks/webcom/batterypower_20120304
https://www.nxtbook.com/nxtbooks/webcom/batterypower_20120102
https://www.nxtbook.com/nxtbooks/webcom/batterypower_20111112
https://www.nxtbook.com/nxtbooks/webcom/batterypower_20110910
https://www.nxtbookmedia.com