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National Semiconductor Introduces SIMPLE SWITCHER Synchronous Regulators with Highest Input Voltage Range

Two New Buck Regulators from National’s PowerWise Energy-Efficient Product Family Feature Input Ranges up to 42V

Oct 1, 2007

October 1, 2007 - National Semiconductor Corporation (NYSE:NSM) today announced the addition of two new, high-efficiency SIMPLE SWITCHER® synchronous buck regulators to its PowerWise® energy-efficient product family.  The highly integrated LM3102 and LM3103 are the industry’s first synchronous buck regulators to feature an input voltage range up to 42V.  Optimized for powering digital integrated circuits (ICs) in industrial and telecommunication applications, the 2.5A LM3102 and the 750 mA LM3103 extends National’s SIMPLE SWITCHER synchronous product line which includes the 1.5A LM3100.

Along with the LM3100, National’s new LM3102 and LM3103 deliver up to 97 percent efficiency, which is eight points higher than comparable non-synchronous products.  Integration of MOSFET switches and the use of small inductors enables a reduced system component count and very small solution size.

The buck regulators utilize a constant on-time (COT) control scheme, which requires no loop compensation.  They also include a patented integrated flywheel current injection control (FCIC), which allows for the use of ceramic capacitors rather than bulkier tantalum capacitors.  The new LM3102 and LM3103, along with all of National’s SIMPLE SWITCHER products, are quick and easy to design using National’s online WEBENCH® power supply design tools.

Key Features and Benefits
The LM3102 and LM3103 synchronous, step-down switching voltage regulators accept an input voltage between 4.5V and 42V and have a programmable switching frequency up to 1 MHz. 

The LM3102 supplies up to 2.5A of current to loads with an output voltage as low as 0.8V.  The LM3103 supplies up to 750 mA of current to output voltages as low as 0.6V.  Both regulators feature excellent line and load regulation.  The LM3102 and LM3103 also run in discontinuous mode for improved efficiency during light load conditions.  The regulators will not discharge a pre-biased output capacitor during start-up, ensuring a monotonic voltage ramp.  The products offer additional features such as programmable soft-start, valley current limit, output over-voltage protection and thermal shutdown for extra protection.

For more information on the LM3102 and the LM3103 or to order samples and an evaluation board, visit http://www.national.com/pf/LM/LM3102.html and http://www.national.com/pf/LM/LM3103.html.  All of the new SIMPLE SWITCHER regulators are available for simulation on National’s WEBENCH design tool.  For more information, visit http://switcher.national.com.

Packaging and Pricing
The LM3102 and LM3103 are available now.  The LM3102 is priced at $2.65 each and is offered in a 20-pin TSSOP with exposed pad.  The LM3103 is priced at $2.00 each and is offered in a 16-pin TSSOP package with exposed pad for improved thermal performance.  All prices are in 1,000-unit quantities.
Note to editors: To view a high-resolution downloadable photo of these products, visit National's photo gallery at http://www.national.com/company/pressroom/gallery/power.html

About National’s PowerWise Brand
National’s PowerWise brand reflects the company’s energy-efficient product portfolio.  It signifies products with outstanding performance-to-power at the component level, as well as products that provide an outstanding, energy-efficient solution when coupled with other National parts.  National’s PowerWise family of products features energy-efficient power management, operational amplifiers, interface and data conversion products.  For more information about National’s PowerWise brand, visit: http://www.national.com/powerwise

About National’s Power Management Products
National solves power management design problems in space- and energy-constrained applications from feature-rich handheld devices through large line-powered systems. From the novice power designer to the power expert, National’s products, people and design tools enable customers to design green-powered systems with complex power supplies in the shortest amount of time. High-performance products include switching regulators such as National’s flagship SIMPLE SWITCHER® family, and application-specific products including white-LED drivers and Power-over-Ethernet controllers. More information about National’s power management products is available 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, interface products and data conversion solutions. National's key analog markets include wireless handsets, displays, communications infrastructure, medical, automotive, industrial, and test and measurement applications. Headquartered in Santa Clara, Calif., National reported sales of $1.93 billion for fiscal 2007, which ended May 27, 2007. Additional company and product information is available at http://www.national.com