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National Semiconductor Introduces the Industry’s Highest Power Density Thin SOT23 Buck Switching Regulators

LM273x Family of Buck Regulators Offers Clock Speeds of up to 3 MHz in Ultra-Small Packaging

Sep 29, 2004

September 29, 2004 - National Semiconductor Corporation (NYSE:NSM) today introduced a new family of switching buck regulators that combine small-outline packaging with the industry's best performance for the highest power density.

The first two members of the family are the LM2734 and LM2736.  The LM2734 can convert an input voltage of 3 V to 20 V down to as low as 0.8 V at an output current of up to 1 A.  The LM2736 can convert an input voltage of 3 V to 18 V down to as low as 1.25 V at an output current of up to 750 mA.  They both operate at switching frequencies as high as 3 MHz and are packaged in a Thin SOT23-6.  Because of this high power density, the regulators are optimized for applications that require high-current switching, such as xDSL modems, consumer applications powered by AC adapters and set-top-boxes.  The LM2734 and LM2736 are designed on National's proprietary PVIP050 process, a sub-micron BCD process that increases the products' industry-leading power density. 

"The introduction of the LM2734 and LM2736 sets a new standard for power management performance from National Semiconductor," said Paul Greenland, marketing director for National Semiconductor's Power Management group.  "The LM2734 and LM2736 combine a high-performance power process and thermally enhanced, small-outline packaging, making them the best solution for applications that are space-constrained, yet still require power management without compromise."

About the LM2734 and LM2736
Key features of National's LM2734 and LM2736 high-frequency buck regulators:

  • Thin SOT23-6 package, switching frequencies as high as 3 MHz and minimal external components result in the industry’s highest power density   
  • Current mode control and internal compensation allow stable operation over a wide input voltage range and reduction of line transients   
  • Pulse width modulation (PWM) provides a predictable, easily filtered switching frequency   
  • The LM2734 is designed to handle an output current of up to 1 A and the LM2736 handles an output current up to 750 mA   
  • The LM2734 operates from a 3 V to 20 V input and the LM2736 operates from a 3 V to 18 V input   
  • Both have 550 KHz, 1.6 MHz and 3 MHz versions.  The 550 KHz and 1.6 MHz versions are available now and the 3 MHz version will be available by year end   
  • The LM2734 can step-down to a voltage as low as 0.8 V and the LM2736 down as low as 1.25 V   
  • Both parts have protection features such as pulse-by-pulse current limit and thermal shutdown

National's Power Management Products
National Semiconductor is the number one supplier of voltage regulator and reference ICs with 12.8 percent market share, up from 11.5 percent in 2002, according to iSuppli's 2004 voltage regulator/reference survey.  Voltage regulators and references are the largest segment in the power management market.  According to the same survey, National’s revenue in this area grew 29.7 percent in 2003 over the previous year, compared to 17.3 percent growth for the industry during the same time period.  National's innovative power management products include industry-leading distributed power, digital core and I/O power, signal-path power, and lighting management solutions, as well as power monitoring, control and reference ICs.  National's WEBENCH® online design tool allows designers to create and analyze a design, and then build a prototype from a custom design kit delivered within 24 hours.  More information about National's power management products is available at power.national.com.

Pricing and Availability
Available today, the LM2734 is priced at $1.60 each and the LM2736 is priced at $1.40 each in 1K volumes.  More information about the products is available at http://www.national.com/pf/LM/LM2734.html
and http://www.national.com/pf/LM/LM2736.html.  The LM2734 and LM2736 are available for electrical simulation and design optimization on National’s WEBENCH online design tool at http://www.national.com/cgi-bin/WebenchTemplate?base_pn=LM2734 and http://www.national.com/cgi-bin/WebenchTemplate?base_pn=LM2736.  A high-resolution downloadable photo of the products is available at http://www.national.com/company/pressroom/gallery/power.html.

About National Semiconductor
National Semiconductor, the industry's premier analog company, creates high performance 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, PCs and laptops.  The company's analog products are also optimized for numerous applications in a variety of electronics markets, including medical, automotive, industrial and test and measurement.  Headquartered in Santa Clara, California, National reported sales of $1.98 billion for fiscal 2004, which ended May 30, 2004.  Additional company and product information is available at www.national.com
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