3W Device from National's PowerWise Energy-Efficient Product Portfolio
Enables EMI-Sensitive Portable Devices with Constant Output Power at Low
Battery Voltages
SANTA CLARA, Calif., Sept. 26 /PRNewswire-FirstCall/ -- National
Semiconductor Corporation (NYSE: NSM) today introduced the industry's first
single-chip 3W mono Class D audio amplifier with spread spectrum technology
and an integrated boost converter. The LM48511 Boomer(R) amplifier, from
National's PowerWise(R) energy-efficient product portfolio, joins the
recently announced 1.2W LM48510 as the second product in a new family of
Boomer Class D audio amplifiers that allow portable products to operate at
constant high- level output power even as batteries deplete to lower
voltages.
The LM48511 drives an 8-Ohm speaker load at 3W continuous power to
enable louder speaker volumes for manufacturers of push-to-talk cell
phones, portable global positioning systems (GPS) and MP3 docking stations
with portable speakers, as well as a broad range of other battery-powered
applications. The LM48511 uses National's unique spread spectrum technology
to lower electromagnetic interference (EMI) emissions more than 11 dB below
the Federal Communications Commission (FCC) limit. The LM48511's 80 percent
efficiency at 5V extends battery life when compared to boosted Class AB
amplifiers, and its independent regulator and amplifier shutdown controls
also optimize power savings by disabling the regulator when high output
power is not required. The device's small footprint reduces printed circuit
board size and lowers development costs.
Key Features - LM48511 Class D Audio Amplifier
The LM48511 high-efficiency Class D audio power amplifier provides 2.5W
to 3W of continuous power into an 8-Ohm speaker when operating from a 3V to
5V power supply with less than 1 percent total harmonic distortion plus
noise (THD+N). The gain of the LM48511 is set by external resistors, which
allows independent gain control from multiple sources by summing the
signals. The LM48511 features a low-power consumption shutdown mode as well
as output short-circuit and thermal overload protection. Advanced
pop-and-click circuitry eliminates output transients which would otherwise
occur during power or shutdown cycles. The amplifier also includes
selectable feedback networks that allow the designer to scale power and
manage efficiency.
Pricing and Availability
Available now in a 24-pin LLP(R) package, the LM48511 is priced at
$1.75 in 1,000-unit quantities. More information and easy-to-order samples
are available at http://www.national.com/pf/LM/LM48511.html. A large
selection of audio amplifiers is supported by National's WEBENCH(R) online
design tool. To explore these solutions, visit http://webench.national.com.
To learn about high-performance audio amplifiers for portable applications,
visit National's library of online seminars and audio design tutorial
eBooks at http://audio.national.com.
About National's Audio Portfolio
National Semiconductor has been a leading provider of audio solutions
for more than 30 years and offers a wide range of products in its
Boomer(R), Overture(R) and high-performance audio lines. National works
with every major handset maker in the world and is the leading provider of
analog audio solutions for the cell phone market. The company's line of
Boomer audio amplifiers and subsystems enhance and enrich the entire range
of sound -- from voice, ring sounds and music -- that can be amplified in
mobile phones and other portable equipment. National manufactures Class AB
and Class D speaker amplifiers, headphone amplifiers and audio subsystems
for many applications ranging from portable devices to high-power,
high-fidelity audio systems. The company offers its higher-power Overture
amplifiers for mid-performance consumer applications, and National's new
high-performance series brings dramatically improved sound quality to
high-fidelity consumer and professional audio equipment. For more
information on National's audio products, visit http://audio.national.com.
About National's PowerWise Brand
National's PowerWise brand reflects the company's energy-efficient
product portfolio. It signifies products with outstanding
performance-to-power at the component level, as well as products that
provide an outstanding, energy- efficient solution when coupled with other
National parts. National's PowerWise family of products features
energy-efficient power management, operational amplifiers, interface and
data conversion products. For more information about National's PowerWise
brand, visit: http://www.national.com/powerwise.
About National Semiconductor
National Semiconductor, the industry's premier analog company, creates
high-value analog devices and subsystems. National's leading-edge products
include power management circuits, display drivers, audio and operational
amplifiers, interface products and data conversion solutions. National's
key analog markets include wireless handsets, displays, communications
infrastructure, medical, automotive, industrial, and test and measurement
applications. Headquartered in Santa Clara, Calif., National reported sales
of $1.93 billion for fiscal 2007, which ended May 27, 2007. Additional
company and product information is available at http://www.national.com.
Boomer, PowerWise, Overture, LLP and WEBENCH are registered trademarks
of National Semiconductor Corporation.
Media Contact Reader Information
Naomi Mitchell Design Support Group
National Semiconductor (800) 272-9959
(408) 721-2142 World Wide Web
Naomi.mitchell@nsc.com http://www.national.com
SOURCE National Semiconductor Corporation
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Related links:
http://www.national.com/
CONTACT:
Naomi Mitchell of National Semiconductor,
+1-408-721-2142, Naomi.mitchell@nsc.com, or Reader Information,
Design Support Group, +1-800-272-9959
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