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National Semiconductor Introduces Industry’s First Synchronous, Monolithic, 1.5A Buck Regulator with Inputs up to 36V

LM3100, the First in a New Synchronous SIMPLE SWITCHER Family, Simplifies Circuit Design with Wide Input Voltage Range from 4.5V to 36V and Constant On-time Architecture

Feb 6, 2006

February 6, 2006 - National Semiconductor Corporation (NYSE: NSM), a worldwide leader in power management technology, today introduced the LM3100, the first member of a new synchronous SIMPLE SWITCHER® family and the industry’s first synchronous, monolithic, 1.5A buck regulator with an input voltage range of 4.5V to 36V.  Architected to simplify circuit designs, this new buck regulator will be complemented in 2006 by additional family members.

“The LM3100 builds on the success of National’s comprehensive SIMPLE SWITCHER product offerings,” said Paul Greenland, director of strategic marketing for National Semiconductor’s Power Management Group. “This synchronous buck regulator combines ease of use, online design tool support, a wide input voltage range and innovative constant on-time architecture.”

Complex digital loads require fast transient response. National’s agile LM3100 employs a high-performance constant on-time (COT) architecture with a proprietary, patent-pending flywheel current injection control (FCIC) that allows the use of ceramic output capacitors without additional equivalent series resistance (ESR) compensation. Input voltage feed-forward rejects line transients and keeps the switching frequency nearly constant when operating from an unregulated supply. The LM3100 also features 0.8V, 1.5 percent feedback, adjustable switching frequency up to 1 MHz and an asymmetrical power stage tuned for step-down conversion. These design benefits make the LM3100 SIMPLE SWITCHER buck regulator easy to use and well-suited for a diverse range of loads and applications, including FPGA, DSP, digital ASIC, networking, gaming, audio-video, medical and industrial.

About the LM3100
The LM3100 includes the following features and benefits:

  • Wide Vin range of 4.5V to 36V, ideal for industrial and automotive infotainment
  • 0.8V, 1.5 percent feedback voltage for next-generation digital cores
  • Ultra-fast load transient response of COT FCIC, which requires no external loop compensation, and is simple and agile with fewer filter capacitors
  • Stable performance, even with low-ESR ceramic filter capacitors, for compact designs
  • Adjustable switching frequency up to 1 MHz for smaller footprint
  • Vin feed forward, which rejects input transients and ensures constant frequency over a wide input voltage range
  • Low external component count, reducing overall system cost and solution size
  • Capable of delivering a continuous 1.5A load current
  • Monolithic synchronous MOSFET for improved efficiency at low output voltages
  • Soft-start to control in-rush current and prevent output voltage overshoot at application of power
  • Output over-voltage protection immediately disables the high-side MOSFET to protect valuable load circuitry
  • Cycle-by-cycle valley current limit for protection against overload and short-circuit loads
  • Thermally enhanced eTSSOP-20 package to reduce junction temperature at maximum load
  • Thermal shutdown to protect the part and its load during overloads

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.

Pricing and Availability
Available now, the LM3100 is priced at $2.50 in 1,000-unit quantities.  For more information about the LM3100, including how to order samples and evaluation boards, please visit http://www.national.com/pf/LM/LM3100.html
.  Engineers can create a design with the LM3100 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 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