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National Semiconductor Introduces PowerWise Energy Management Unit that Reduces Power Consumption in Handheld Consumer Products up to 70 Percent

Digitally-controlled LP5550 Supports Adaptive Voltage Scaling, Extends Battery Life and Enables New Features

Oct 25, 2006

October 25, 2005 - Worldwide power management technology leader National Semiconductor Corporation (NYSE:NSM) today announced the industry’s first digitally-controlled PowerWise™ energy management unit (EMU), a highly integrated circuit that reduces the power consumption of digital processors used in battery-powered handheld consumer products.  The LP5550 EMU, used in conjunction with National’s advanced power controller (APC) and intelligent energy manager (IEM) technology from ARM Ltd., reduces the power consumption of digital processor cores by up to 70 percent.  The LP5550 and APC also support the PowerWise Interface (PWI) open-industry standard introduced by National Semiconductor and ARM.

National’s LP5550 enables a digital processor to adaptively adjust its supply voltage to the minimum level needed, greatly reducing its power consumption.  The LP5550 includes an adaptive-supply-voltage buck regulator for the processor core and three additional fixed-voltage regulators.  The fixed-voltage regulators power the input/output ring, oscillator/phase-locked loops (PLL) and memory on a low-power system-on-chip (SoC).  The PWI interface controls the LP5550’s functions for simple interfacing to the digital processor.

“National Semiconductor’s LP5550 redefines the industry standard for power conversion efficiency,” said Ravi Ambatipudi, director of Advanced Power Products at National Semiconductor.  “Using sophisticated digital power management control, the LP5550 maximizes both system and power conversion efficiency.  This energy savings allows handheld device manufacturers to provide new features such as video and 3D gaming while maintaining long battery life.”

Key Technical Specifications of National’s LP5550
The LP5550 supports the PWI interface, a 2-pin, high-speed serial power management control interface for advanced processor power management.  To enable adaptive voltage scaling, the LP5550 includes a digitally-controlled, 300 mA, 0.6V to 1.2V buck regulator with up to 90 percent efficiency.  In addition, it has three programmable low drop-out (LDO) regulators with output voltages ranging from 0.6 V to 3.3V.  One LDO supports 100 mA and the other two support 250 mA.

Packaged in a small-footprint, lead-free, 16-pin LLP® package, the LP5550 has excellent package thermal characteristics and operates over the full temperature range from –40 degrees C to +85 degrees C, with input voltages from 3.0V to 5.5V.

About National’s Advanced Power Controller
Compliant with the AMBA™ specification, National’s APC is a synthesizable macro-cell that includes a hardware performance monitor.  The APC automatically calibrates for process and temperature variations, and communicates with the LP5550 using the PWI interface.  The processor supply voltages are reduced to the absolute minimum necessary to meet the required level of performance at all operating frequencies.  The APC is available for licensing from ARM.

About Adaptive Voltage Scaling
Adaptive voltage scaling is a technique for determining the minimum supply voltage for a digital processor during operation.  This technology significantly reduces the supply voltage of a digital processor by removing voltage margins associated with process, temperature, IR-drop and regulator tolerances.  The advanced power controller, together with National’s LP5550, enables customers to easily deploy this technology in their platforms.

For more information about the PowerWise adaptive voltage scaling technology visit http://powerwise.national.com.  For more information about the PowerWise Interface visit http://www.pwistandard.org.  An online seminar, “PowerWise Adaptive Voltage Scaling Technology,” is available for on-demand viewing at http://www.national.com/onlineseminar/2003/powerwise/adaptive.html.
For more information or to order samples of the LP5550, visit http://www.national.com/pf/LP/LP5550.html

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

Pricing and Availability
The LP5550 is available now and is priced at $4.50 in 1,000-unit quantities.  Lead-free package options are also available.

Note to Editors:  To view a high-resolution downloadable photo of this product, 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, communication interface products and data conversion solutions.  National's key 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