AnalogicTech's Dual Input Charger IC Maximizes Reliability, Reduces Footprint With Integrated OVP
January 13 2009 - 7:55AM
PR Newswire (US)
Smart Battery Charger Intelligently Manages ADP, USB Inputs SANTA
CLARA, Calif., Jan. 13 /PRNewswire-FirstCall/ -- Advanced Analogic
Technologies, Inc. (AnalogicTech(TM)) (NASDAQ:AATI), a developer of
power management integrated circuits, announced today the AAT3691,
a dual input battery charger IC with integrated over-voltage
protection (OVP) up to 28V. Designed to meet industry requirements
for highly flexible and reliable battery charging from multiple
sources, the new battery charger supports inputs from both AC
adapters and USB ports in applications such as mobile phones,
digital still cameras and other handheld devices. The charger
intelligently assesses which input source offers minimum charging
time and modifies the charge path, while the integrated OVP
protects the battery and system against faulty input. (Logo:
http://www.newscom.com/cgi-bin/prnh/20050829/SFTU089LOGO) "Today's
portable system designers need a battery charging solution that not
only supports input from both AC adapters and USB ports, but also
protects the battery, the charger and the system," says Siamak
Bastani, Product Line Director. "By integrating OVP protection up
to 28V for both inputs, the AAT3691 helps designers maximize
charging flexibility and reliability while reducing parts count and
end product footprint." Fast OVP Response The AAT3691 is designed
to regulate battery charge voltage and current for 4.2V lithium-ion
battery cells used in a wide variety of portable systems. As an
integrated battery charger IC which combines a power device,
reverse current blocking and current sensing, the device is
designed to operate from AC adapter inputs and USB ports across a
3.0V to 6.75V (typical) input voltage range. To maximize safety,
the AAT3691 adds integrated OVP up to 28V. The OVP block offers an
extremely fast response of < 1 us. Charge current can be
programmed up to 1.6A for charging via an ADP and up to 0.5A for
charging via a USB port using external resistors. When ADP or USB
input power exceeds 6.75V typical, an internal series switch opens
preventing damage to the battery or charging circuit. Charging and
OVP total ON resistance (RDS(ON)) for the AAT3691 is a very low 600
milliohms max. Automatic charge selection circuitry recognizes the
best charging source in terms of input voltage and other criteria
and modifies the charge path to minimize charge time. The AAT3691
also features a no battery present input (NOBAT) detection function
which prevents input power from passing through the OVP block and
suspends charging when no battery is present or a battery trace or
connector is defective. The new charger IC also offers a variety of
other protection features to protect the charging device, the
control system and the battery. Battery charging status is
continually monitored for fault conditions. Safety features include
thermal shutdown protection, power on reset and soft start. Second
Charger IC AnalogicTech is also offering a slightly modified
version of the AAT3691 which provides all the features described
above and adds an integrated LDO. The LDO on the AAT3695 (to be
available Q2, 2009) can be used to power a transceiver or
housekeeping microcontroller on a cell phone or other portable
device during the charge cycle, minimize current draw from the
system and shorten charge time. Price and Availability The AAT3691
is qualified across the -40 degrees C to +85 degrees C temperature
range. It is available in a 16-pin 3 x 4-mm TDFN package. It sells
for $1.12 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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