Advanced Analogic Technologies Introduces Lowest-Power Load Switch Available for Biometric Security Devices
September 08 2009 - 8:00AM
PR Newswire (US)
Integrated Load Switch/LDO Regulator Simplifies Feature
Development, Offers Increased Protection for Notebook and Smart
Phone Applications SANTA CLARA, Calif., Sept. 8
/PRNewswire-FirstCall/ -- Advanced Analogic Technologies, Inc.
(NASDAQ:AATI), an analog semiconductor company focused on powering
innovative solutions in consumer, industrial, and telecom markets,
introduced the AAT4702, a highly integrated load switch that
requires half the board footprint of discrete alternatives. In
addition to its small size, the AAT4702 consumes a 15 micro-A
quiescent current, far less than any other integrated load
switch/low-dropout (LDO) regulator on the market. (Logo:
http://www.newscom.com/cgi-bin/prnh/20050829/SFTU089LOGO) Packaged
in a compact 8-pin, 2x2-mm FTDFN package, the AAT4702 is a
current-limited P-channel metal-oxide-semiconductor field-effect
transistor (MOSFET) power switch with an integrated LDO regulator
that offers a variety of protection features including auto
restart, reverse current blocking and a fault flag to deliver the
highest available level of load current protection in a load
switch. "A growing number of applications, such as fingerprint
sensing circuits, require both a system power supply and load
current protection. The AAT4702 does both," said CJ Zhang, product
line vice president. "By integrating a current limited load switch
and an LDO in a single compact IC that requires minimal power
resources, our new load switch gives notebook and mobile device
designers an opportunity to support these applications in a much
smaller, lower power circuit." A member of AnalogicTech's
Application Specific Power MOSFET (ASPM) product family, the
AAT4702's load switch current limit is set at 150 mA as a default,
but it is programmable up to 1A via an external set resistor. To
further protect system loads or peripheral circuits from
over-current conditions, the new load switch adds an auto-restart
function that wakes up and re-enables the device every 40 ms to
check for the continued existence of an over-current condition. If
the over-current condition remains, the AAT4702 stays in shutdown
mode with both the load switch and LDO regulator output pulled low
to ground. This allows the device to automatically resume operation
once the over-current condition ends, eliminating the risk of
damage. An integrated FAULT flag feature that indicates an
over-current or over-temperature condition is also available,
adding a 5 ms blanking time to prevent reports of false events. The
AAT4702 also adds reverse current blocking to protect the load
switch from reverse current potentials when the device is shut
down. The integrated load switch/LDO operates from inputs ranging
from 2.4V to 5.5V. The LDO integrated into the AAT4702 delivers a
regulated 1.8V supply voltage with plus or minus 2 percent accuracy
at load levels up to 100 mA. It may be powered either directly from
an input source supply or via the load switch output. Quiescent
current for the AAT4702 is 15 micro A typical, by far the lowest
specification in the industry for integrated solutions of this
type. Shutdown current is less than 1 micro A. The single-chip
solution offers up to a 50 percent board space savings compared to
comparable discrete solutions. Price and Availability Qualified
across the -40 C to +85 C temperature range, the AAT4702 is
available in a compact 8-pin, 2x2-mm FTDFN package and is priced at
$0.59 in 1K quantities. More information:
http://www.analogictech.com/products/product_part.php?PID=175 About
Advanced Analogic Technologies, Inc.: Advanced Analogic
Technologies (NASDAQ:AATI) develops advanced semiconductor system
solutions that play a key role in the continuing evolution of
feature-rich, energy efficient electronic devices. The company
focuses on addressing the application-specific power management
needs of consumer devices such as mobile handsets, digital cameras,
and netbooks/notebooks, as well as devices in a broad range of
industrial, medical and telecom applications. AATI also licenses
device, process, package, and application-related technologies.
Headquartered in Silicon Valley, AATI has design centers in Santa
Clara and Shanghai, and Asia-based operations and logistics. For
more information, please visit 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, ; or Dave Richardson
of Impress Public Relations, +1-415-994-1423, , for Advanced
Analogic Technologies, Inc. Web Site: http://www.analogictech.com/
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