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National Semiconductor’s New Integrated Converters Feature Greater Than 90 Percent Efficiency Over a Wide Load Range

High-Performance Buck-boost and Buck-buck Converters Increase Efficiency and Extend Battery Life in High-Current Applications

Aug 22, 2005

August 22, 2005 – Worldwide power management technology leader National Semiconductor Corporation (NYSE:NSM) today introduced two new high-performance converters that increase efficiency and extend battery life in high-current applications.  The LM2716 buck-boost and LM2717 buck-buck converters each feature greater than 90 percent efficiency over a wide load range for extended battery life in embedded computer systems, set-top boxes, portable Internet access devices, general point-of-load architectures, and monitors and televisions, including TFT/LCD flat-panel displays.

Both converters are well-suited for applications where multiple high-current, low-voltage power supplies are needed to power system loads, including field programmable gate-arrays (FPGAs), digital signal processors (DSPs) and digital application-specific integrated circuits (ASICs).  The LM2716 and LM2717 also offer added flexibility, with one fixed output and one adjustable output voltage in a single, integrated chip.  External soft-start for each converter limits input surge current at start-up, and independent shutdown allows users to disable each regulator separately.

“The use of distributed power architectures with adjustable output voltages has become increasingly popular for powering digital ASICs and DSPs," said Yoon Paek, marketing director for National Semiconductor’s Portable Power Products Group.  “National’s new buck-boost and buck-buck converters provide exceptionally flexible and high-performance solutions for these point-of-load architectures.”

Key Technical Specifications of National’s LM2716 Buck-Boost Converter and the LM2717 Buck-Buck Converter
The LM2716 is composed of two pulse width modulation (PWM) DC/DC converters.  A buck (step-down) converter is used to generate a fixed output voltage.  A boost (step-up) converter is used to generate an adjustable output voltage.  The LM2717 is composed of two PWM DC/DC buck converters. 

Both converters feature low RDSon (0.16 ohm and 0.12 ohm) internal switches for maximum efficiency.  Operating frequency can be adjusted between 300 kHz and 600 kHz, allowing the use of small external components.  The LM2716 and LM2717 are packaged in a low profile, 24-pin TSSOP.

For more information about the LM2716 and LM2717 or to order samples, visit http://www.national.com/pf/LM/LM2716.html or http://www.national.com/pf/LM/LM2717.html.  To order an evaluation board, visit http://www.national.com/store/view_item/index.html?nsid=LM2716MTEV or http://www.national.com/store/view_item/index.html?nsid=LM2717MTEV.

About National’s Power Management Products
National Semiconductor is the number one supplier of power management ICs with 14.1 percent market share, according to iSuppli’s 2005 voltage regulator/reference survey.  National’s power management revenue grew 37.3 percent in 2004 over the previous year, compared to 24 percent growth for the industry.  National's innovative power management products include best-in-class linear regulators; power monitoring, control and reference ICs; and switching converters, such as high-voltage ICs for DC-DC conversion, switched capacitor converters, lighting management ICs and inductive switching converters.  National also offers online tools that enable power designers to select the best power management chips for their applications.  National's Webench® design tool allows designers to choose a product, create and analyze a design, and then build custom prototypes that can be delivered within 24 hours.  More information about National’s power management products is available at

Pricing and Availability
The LM2716 and LM2717 are available now.  Priced in 1,000-unit quantities, the LM2716 is $2.40 and the LM2717 is $2.45.  Lead-free package options are also available.

Note to editors:  To view a high-resolution downloadable photo of these products, visit National's photo gallery at http://www.national.com/company/pressroom/gallery/power.html.

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 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