TI Home > News Releases

News Releases

National Semiconductor Introduces Industry’s First Constant Output Class D Audio Amplifier

National Semiconductor Introduces Industry’s First Constant Output Class D Audio Amplifier 1.7W High-Efficiency Device Eliminates the Need for External Boost Converter

Feb 5, 2007

February 5, 2007 — National Semiconductor Corporation (NYSE:NSM) today introduced the first product in a new line of Boomer® Class D audio amplifiers with integrated converter technology that eliminates the need for an external boost converter. The LM48510 enables manufacturers to design portable products that are able to operate at constant high-level output power even as batteries deplete to lower voltages.

The new audio amplifier provides the boosted power portable products need when operating on low battery voltages. The amplifier’s small footprint makes it well-suited for portable global positioning systems (GPS), wireless handsets, portable media players, medical equipment, voice-prompted fire alarms and a broad range of other battery-powered applications. In addition to its small footprint, National’s LM48510 uses minimal external components, which saves significant board space compared to multi-chip solutions.

High Output Power
National’s LM48510 is capable of creating 1.2W of continuous power to an 8-Ohm speaker from a 3V input voltage. The amplifier drives a 4-Ohm speaker load at a continuous output power of 1.7W with less than 1 percent total harmonic distortion plus noise (THD+N). 

The Boomer amplifier 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 LM48510 is externally configurable for independent gain control from multiple sources.

Pricing and Availability
Available now in a 0.5 mm-pitch, 16-pin LLP® package, the LM48510 is priced at $1.35 in 1,000-unit quantities. More information and easy-to-order samples are available at http://www.national.com/pf/LM/LM48510.html. A large selection of audio amplifiers is supported by National’s WEBENCH® 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 audio.national.com.

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

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®, Overture® 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 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, 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, Calif., National reported sales of $2.16 billion for fiscal 2006, which ended May 28, 2006.  Additional company and product information is available at