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National Semiconductor Introduces Industry's First 75V, 2.5A, Integrated Buck Regulator

LM5005 Features Innovative Emulated Current-Mode Control Method with PWM Switching Frequency Up to 500 kHz

Sep 13, 2005

September 13, 2005 - National Semiconductor Corporation (NYSE: NSM) today expanded its family of high-voltage buck regulators with the introduction of the LM5005.  This high-frequency buck regulator steps down an input voltage from 7V to 75V to produce a regulated 2.5A power supply, adjustable from 1.225V to 65V.  Reliable and compact, the LM5005 is optimized for 48V telecom, automotive and industrial power supply applications.

“The LM5005 addresses our customers’ requests for a higher-current version of the popular 75V, 1.0A LM5010 and 75V, 0.5A LM5007 buck regulators,” said Paul Greenland, director of strategic marketing for National Semiconductor’s Power Management Group.  “The entire family is highly integrated for a smaller overall footprint, with unique, high-frequency PWM control circuitry that allows our customers to implement step-down switching regulators with minimal filtering and external components.”

About the LM5005
The LM5005 high-voltage switching regulator integrates a 75V N-channel MOSFET and employs a proprietary scheme that uses emulated, current-mode pulse-width modulation (PWM) to produce a 2.5A step-down regulator with minimal external components.  This proprietary control method generates an internal emulated inductor current ramp which significantly reduces the noise sensitivity of the controller.  This allows the LM5005 to reliably control very small duty cycles so designers can take full advantage of the LM5005’s wide 75V input range and 500 kHz frequency capabilities.  In addition, current-mode control provides inherent line voltage feed-forward and simplified loop compensation. 

The programmable operating frequency can range from 50 kHz to 500 kHz.  A novel, bi-directional oscillator synchronization pin allows multiple LM5005 regulators to self-synchronize or switch synchronously with an external clock.  Additional protection features include current limit, thermal shutdown and remote shutdown capability.  The device is available in the TSSOP-20 package, featuring an exposed mounting pad to enhance the package’s thermal dissipation.

Pricing and Availability
Available now, the LM5005 is priced at $3.25 in 1,000-unit quantities.  For more information about the LM5005, including how to order samples, please visit http://www.national.com/pf/LM/LM5005.html
.  Engineers can create a design with the LM5005 and simulate it on National’s Webench online design tool.

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

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 http://power.national.com
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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 www.national.com
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