National Semiconductor Introduces Industry's First Synchronous Buck Controller with 1 Percent Voltage Feedback Accuracy Across Expanded Industrial Temperature Range

National Expands Family of Synchronous Controllers for Managing Complex Power Requirements of ASICs, DSPs, FPGAs

SANTA CLARA, Calif., April 10 /PRNewswire-FirstCall/ -- National Semiconductor Corporation (NYSE: NSM) today added four new products to its popular LM274x family of synchronous buck controllers, including the LM2747, the industry's first voltage-mode pulse-width modulation (PWM) synchronous buck controller that offers 1 percent voltage feedback accuracy across an extended industrial temperature range. All four controllers provide precise core regulation in ASICs, DSPs and FPGAs. They are also designed to work at higher frequencies, which reduces the power solution footprint.

"These additions to National's LM274x family of controllers have a unique feature set that is optimized for powering existing and future generations of digital cores," said Michael White, business unit director for National Semiconductor's Power Management Group. "This combination of complex-load- specific features and precision means that designers powering ASICs, FPGAs and DSPs can use a single LM274x controller to achieve best-in-class performance with a minimal footprint."

About the LM274x Family

The LM2747 offers 1 percent voltage feedback accuracy across an extended industrial temperature range of -40 degrees C to +125 degrees C, particularly significant for cores operating below 1V. It also has a 40 ns minimum ontime, capable of providing an output of 0.6V from a 12V rail at a switching frequency of 1MHz. In addition, the LM2747 feature set includes pre-bias load start-up capability, soft-start with tracking, a precision enable for sequencing of power rails, and external clock synchronization to reduce interaction with other supplies and sensitive load circuitry.

The LM2746 has the same performance as the LM2747 but does not include the pre-bias load start-up capability or the external clock synchronization feature. The LM2745 has the same feature set as the LM2747, but offers reduced voltage feedback accuracy of 1.5 percent over the extended temperature range. The LM2748 has the same accuracy as the LM2745, but without an external clock synchronization feature.

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(R) 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

Available now, the LM274x family is priced starting at $1.45 in 1,000-unit quantities for the LM2746. For more information about the LM274x family, including how to order samples and evaluation boards, please visit . To view a high-resolution downloadable photo of these products, visit National's photo gallery at .

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

NOTE: National Semiconductor and WEBENCH are registered trademarks of National Semiconductor Corporation. All other brand or product names are trademarks or registered trademarks of their respective holders.

     Megan Carter                  Design Support Group
     National Semiconductor        800-272-9959
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