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National Semiconductor Introduces World’s Smallest Class AB Audio Amplifier

LM4995 Delivers Improved Output Power, Reduces Chip Size by 30 Percent

Apr 17, 2006

April 17, 2006 - National Semiconductor Corporation (NYSE:NSM) today introduced a Boomer® 1.3W mono Class AB audio amplifier in the world’s smallest micro SMD package for cell phone handsfree and ringer functions. 

The LM4995 is a housed in a 1.25 mm by 1.25 mm, 0.4 mm-pitch micro SMD package to save space in manufacturers’ designs. This package uses 30 percent less space on the printed circuit board than existing audio amplifiers, facilitating easier layout in small spaces.

Operating on a single 5V supply, the LM4995 is capable of driving an 8-Ohm speaker load at a continuous average output of 1.3W with less than one percent total harmonic distortion plus noise (THD+N). The LM4995 offers a high power supply rejection ratio (PSRR) of 74 dB at 217 Hz and a low quiescent power supply current of 1.6 mA for longer battery life in portable systems.

The LM4995 does not require bootstrap capacitors or snubber circuits, which reduces the size as well as the number of external components needed.  It features a low-power-consumption shutdown mode and an internal thermal shutdown protection mechanism, as well as advanced pop-and-click circuitry that eliminates output transients which would otherwise occur during power or shutdown cycles.  The LM4995 is also unity-gain stable and has externally configurable gain that use simple gain-setting resistors.

Innovative, Advanced IC Package Technologies
Developed by National engineers in Santa Clara, Calif., and Melaka, Malaysia, the 0.4 mm- pitch micro SMD package is the next generation of the industry-leading micro SMD packaging family that National originated in 1999.  This new package utilizes advanced manufacturing processes for making silicon, bumping and back-grinding technologies. Manufacturers can use the package with conventional surface-mount handling equipment.

National produces billions of chips per year and packages them in more than 70 different package types.  The company has more than 290 patents in package technologies and receives approximately 30 new packaging patents each year. National has introduced several packaging innovations to the industry, including the micro SMD and LLP® packaging technologies.

Pricing and Availability
Available now in a lead-free, 9-bump micro SMD package, the LM4995 is priced at 65 cents in 1,000-unit quantities. More information, easy-to-order samples and an evaluation board are available at http://www.national.com/pf/LM/LM4995.html. National’s WEBENCH® online design tool supports a large selection of audio amplifiers.  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

Note to editors:  To view a high-resolution, downloadable photo of this product, visit National's photo gallery.

About National’s Audio Portfolio
National Semiconductor works with every major handset maker in the world and is the leading provider of audio amplifier systems for the cell phone market.  The company’s line of Boomer audio amplifiers enhances and enriches the entire range of sound – from voice, ring sounds and music – that can be amplified in a mobile phone.  National manufactures Class AB and Class D mono and stereo speaker amplifiers, mono and stereo headphone amplifiers, and audio subsystems for desktop and notebook computers, multimedia displays and portable electronic devices.  The company also offers its higher-power Overture® amplifiers for consumer stereo and home theater systems.  For more information on National’s audio products, visit audio.national.com.

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, communication interface products and data conversion solutions. National's key analog markets include wireless handsets, displays and a variety of broad electronics markets, including medical, automotive, industrial, and test and measurement applications. Headquartered in Santa Clara, California, National reported sales of $1.91 billion for fiscal 2005, which ended May 29, 2005.  Additional company and product information is available at www.national.com.