AnalogicTech's Battery Charger IC Dynamically Manages System Load and Charging
December 01 2008 - 7:55AM
PR Newswire (US)
Dual Path Device Automatically Routes Power from Battery to System
When Load Requirements Exceed Adapter Capabilities SANTA CLARA,
Calif., Dec. 1 /PRNewswire-FirstCall/ -- Advanced Analogic
Technologies Inc. (AnalogicTech(TM)) (NASDAQ:AATI), a developer of
power management integrated circuits, announced today the AAT3672,
a highly integrated, single-cell Lithium-ion (Li-on)/polymer
battery charger and system management IC. Using an innovative
three-switch architecture, the dual path device enables
simultaneous battery charging and system load management. It
automatically reroutes power from the battery to the system without
interruption when load requirements exceed available current. As a
single-chip alternative to complex discrete solutions, the AAT3672
simplifies power circuit design, reduces board space requirements
and drives down system cost in a wide variety of smart phones,
navigation devices, and portable media players (PMPs). (Logo:
http://www.newscom.com/cgi-bin/prnh/20050829/SFTU089LOGO) "In a
number of situations, such as when a GPS-enabled GPRS phone
switches zones, a cellular handset or portable system may require
more current than the power adapter can deliver," explains Siamak
Bastami, product line director for AnalogicTech. "Typically
designers compensate for this possibility by using a larger, more
expensive adapter or requiring intervention and control by the
system processor. To address this problem and avoid a power
interruption and system reset, the AAT3672 offers a single, highly
integrated solution, delivering additional power as required from
the battery." Dynamic Power Sourcing The AAT3672 is a single input
dynamic battery charger and control IC, compatible with either an
AC power adapter or a USB port power source. Dynamic power control
allows the device to charge a single-cell Li-on battery and power a
system load simultaneously. The device regulates battery charge
current and voltage for 4.2V Li-on battery cells. Battery charge
current can be programmed up to 1.6A. Three internal switches on
the device provide dynamic power sourcing to the system load. If
the system load exceeds the input current supply from the input
source, the AAT3672 supplies additional current from the battery
cell. The device automatically manages distribution of power
between the source, the battery and the system simultaneously to
support all power needs , charging the battery cell with the
maximum amount of current possible. To help minimize charge time
and protect an input source from overload, the AAT3672 features an
automatic battery charge current reduction loop that automatically
compensates for voltage sags and throttles back the charge current
when the input source cannot provide the required load current.
This feature protects the charger, system and source supply if an
adapter or power source cannot meet the programmed ADP charging
mode current demand. The AAT3672 also features an intelligent
thermal loop control system that continuously measures internal
circuit die temperature and automatically reduces fast charge
current when the device exceeds a preset internal temperature
threshold. By automatically monitoring circuit die temperature and
adjusting fast charge current as die temperature changes, this
function helps optimize charging by maximizing charge current under
given temperature conditions. The new charger/system management IC
also offers a number of protection features including battery
over-voltage, over-current and over-temperature protections
circuits. It also adds system load current limiting capability.
Price and Availability Qualified across the -40 degrees C to +85
degrees C temperature range, the AAT3672 is available in a compact
14-pin, 3 x 3-mm TDFN package. The IC sells for $0.95 in 1K
quantities. About AnalogicTech Advanced Analogic Technologies, Inc.
(AnalogicTech) is a supplier of Total Power Management(TM)
semiconductor solutions for mobile consumer electronic devices,
such as wireless handsets, notebook and tablet computers,
smartphones, digital cameras, wireless LAN, and personal media
players. The company focuses its design and marketing efforts on
the application-specific power management needs of consumer,
communications, and computing applications in these rapidly
evolving devices. AnalogicTech also develops and licenses device,
process, package, and application-related technology. AnalogicTech
is headquartered in Santa Clara, California and Macau, S.A.R., with
offices in China (Beijing, Shanghai and Shenzhen), Hong Kong,
Taiwan, Japan, South Korea, Sweden, France and United Kingdom, as
well as a worldwide network of sales representatives and
distributors. The company is listed on the NASDAQ exchange under
the ticker symbol AATI. For more information, please visit the
AnalogicTech website: http://www.analogictech.com/. (AnalogicTech -
G) AnalogicTech and the AnalogicTech logo are trademarks of
Advanced Analogic Technologies Incorporated. All other brand and
product names appearing in this document are registered trademarks
or trademarks of their respective holders.
http://www.newscom.com/cgi-bin/prnh/20050829/SFTU089LOGO
http://photoarchive.ap.org/ DATASOURCE: Advanced Analogic
Technologies Inc. CONTACT: Karolien Cools-Wittry of Advanced
Analogic Technologies Inc., +1-408-737-4600, Karoliencw (at)
analogictech.com; or Matthew Quint of Quint Public Relations,
+1-650-599-9450, , for Advanced Analogic Technologies Inc. Web
site: http://www.analogictech.com/
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