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National Semiconductor Introduces Designer-Friendly, Quad-Output Power Management Units

Small, Multi-Channel Devices Integrate Dual Buck Regulators, Dual LDOs for Space-Constrained Applications

Sep 14, 2006

SANTA CLARA, Calif. and MUNICH, Germany – September 14, 2006 – National Semiconductor Corporation (NYSE:NSM) today introduced two new, integrated power management units (PMUs) to its family of designer-friendly, easy-to-use PMUs.  Optimized to power mid-range, quad-output applications, such as low-power FPGAs, microprocessors and DSPs, the LP3906 and LP3905 PMUs each feature two high-efficiency buck regulators and two ultra-low-noise, low-dropout regulators (LDOs).  The high level of integration simplifies system design and increases space efficiency.

National’s LP3906 and LP3905 PMUs will be shown in National’s booth #506 in Hall A4, at the Electronica trade show in Munich, Germany, from November 14-17.

National’s LP3906 PMU features an I2C compatible interface for programmability.  This digital interface provides the flexibility to use the same device for multiple solutions that require different output voltages.  By including dynamic voltage scaling with 96 percent conversion efficiency, the power consumption of the powered device, such as a microprocessor, is reduced, thus maximizing the power efficiency of the entire system.  Example applications for these products include powering an embedded processor, in which each switching regulator can drive the core and input/output while each LDO supplies the analog and peripheral functions.  In FPGA applications, the dual regulators power the core and I/O voltages, and the dual LDOs power the auxiliary voltages that supply the embedded peripherals such as communication engines.

"The small footprint of National’s LP3906 is a great complement to our cost-optimized Spartan-3E FPGA platform,” said Steve Knapp, senior applications manager of the General Products Division at Xilinx, Inc.  “National’s LP3906 is fully programmable through an I2C interface and can control supply voltage ramps. With quad regulators in a single package, we can eliminate additional discrete components and address the same cost-effective board efficiency needs that our Spartan-3E customers demand for their leading-edge solutions.”

Technical Features of National’s LP3906 PMU
Available in a small, 24-pin thermally enhanced LLP® package that measures 4 mm by 5 mm, the LP3906 PMU provides designers with a simple, highly efficient,and flexible solution to efficiently drive core I/O and auxiliary power.  It features two integrated 1.5A, high-efficiency buck  regulators and two 300 mA linear regulators with an I2C compatible interface for programmability.  The dual buck regulators have a dynamically programmable, wide-output voltage range from 0.8V to 3.5V with up to 96 percent efficiency.  This high efficiency is accomplished by intelligent automatic switching between PWM and PFM modes.  The dual linear regulators have a dynamically programmable wide output voltage range from 1.0V to 3.5V.  The high-speed serial interface for independent control of device functions and settings enables features such as dynamic voltage management, power-up sequencing control and design flexibility.

For more information on the LP3906 or to order samples, visit http://www.national.com/pf/LP/LP3906.html

Technical Features of National’s LP3905 PMU
Available in a tiny, 14-pin thermally enhanced LLP package that measures 4 mm by 4 mm, National’s LP3905 PMU contains two integrated, 600 mA, high-efficiency buck regulators and two 150 mA, ultra-low-noise linear regulators.  The dual buck regulators have a fixed and adjustable output voltage range from 1.0V to 3.3V with up to 90 percent efficiency.  The buck regulators feature intelligent automatic switching between PWM and PFM modes to achieve the highest efficiency possible for the entire load range.  When operating in PWM mode, both regulators have a switching frequency of 2 MHz, allowing use of small external components.  The dual linear regulators have an output voltage range from 1.5V to 3.3V, with low dropout voltage and low output voltage noise. 

For more information on the LP3905 or to order samples, visit http://www.national.com/pf/LP/LP3905.html.

About National’s Power Management Products
National Semiconductor is the number one supplier of voltage regulator ICs with 14 percent market share, according to iSuppli’s 2005 Semiconductor Market Share survey.  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

Availability and Pricing
The LP3906 and LP3905 are available now.  The LP3906 is priced at $3.30 each and the LP3905 is priced at $2.50 each 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 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 and a variety of broad electronics markets, including medical, automotive, industrial, and test and measurement applications. Headquartered in Santa Clara, Calif., National reported sales of $2.16 billion for fiscal 2006, which ended May 28, 2006.  Additional company and product information is available at www.national.com