National Semiconductor Introduces Industry's First Secondary Side Post Regulator Capable of Operating as Stand-alone Buck Regulator

Flexible, High-Frequency LM5115 Controller Allows More Integrated Solutions in Consumer Electronics, Battery-Powered Applications

APEC, AUSTIN, Texas, March 7 /PRNewswire-FirstCall/ -- National Semiconductor Corporation (NYSE: NSM) today announced the LM5115, the industry's first controller that can be used as either a secondary side post regulator (SSPR) or as a stand-alone buck regulator.

When paired with National's LM5025 primary-side regulator, the LM5115 SSPR enables designers to develop synchronized, efficient multiple-output DC-DC power supplies. Used in the stand-alone configuration, the LM5115 operates as a high-voltage (75 V) synchronous buck controller. Applications for the LM5115 include multi-output DC-DC power modules and wide-input-range DC-DC power sources for industrial and consumer electronic products.

National is demonstrating the LM5115 at the Applied Power Electronics Conference and Expo (APEC) in Austin, Texas. The exhibit is open through March 9 at the Hilton Austin Downtown Hotel and National's demonstrations are in booth 606/608. For more information on National's products and speakers at APEC, please visit

"The flexible LM5115 is the industry's first secondary side post regulator that also operates in a free-run mode as a high-voltage buck regulator," said Paul Greenland, director of product marketing for National Semiconductor's Power Management group. "This unique versatility makes the LM5115 the only solution for customers who want the option of using a controller as a stand- alone high-voltage buck regulator or pairing it with a primary-side regulator such as the LM5025."

  Compelling Features and Benefits
  The LM5115 has the following features and benefits:
  -- Operates from AC or DC input up to 75 V peak
  -- Synchronizes to the main channel DC-DC converter
  -- Optional free-run mode for stand-alone operation from DC input
  -- Voltage-mode pulse width modulation with input voltage feed-forward
  -- Boot-strapped high-side and low-side MOSFET drivers sink 2.5 A peak
  -- Precision reference provides accurate 0.75 V feedback threshold
  -- Output voltage adjustable from 0.75 V to 12 V
  -- Error amplifier with wide 4 MHz bandwidth
  -- Current sense amplifier limits forward and reverse inductor current
  -- Programmable soft-start for controlled turn-on

  About National's Power Management Products

National Semiconductor is the number one supplier of power management ICs with 12.8 percent market share, according to iSuppli's 2004 voltage regulator/reference survey. National's power management revenue 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 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's WEBENCH(R) online design tool allows designers to select a power management 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

National's LM5115 is available in a tiny, thermally enhanced 16-lead LLP(R) package and is priced at $1.50 each in 1,000-unit quantities. More information is available at .

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

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

CONTACT: Megan Carter of National Semiconductor, +1-408-721-6929, or Email Contact.

CONTACT: Megan Carter of National Semiconductor, +1-408-721-6929, or
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