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National Semiconductor Adds Three Tiny White LED Drivers for Mobile Phone Display Backlighting to Leading Power Management Portfolio

Micro SMD Packaging Provides Smallest Footprint in the Industry

Mar 15, 2005

CTIA, New Orleans, Louisiana – March 15, 2005 – Worldwide power management technology leader National Semiconductor Corporation (NYSE:NSM) today introduced three new charge-pump-based white light-emitting diode (LED) drivers for mobile phone display backlighting.  The LM27953, LM2796 and LM27961 white LED drivers feature a tiny chip-scale 18-pin micro SMD package that provides the smallest footprint in the industry. 

These products complement National’s industry-leading portfolio by providing greater flexibility for LED configurations.  The LED drivers provide highly efficient LED backlighting for portable devices including digital still cameras, MP3 players, personal digital assistants, hard disk drives, wireless local area networks and other low-power, small form-factor products.

"In 2003, National Semiconductor’s industry-leading white LED drivers enabled the fast adoption of color displays in mobile phones," said Peter Henry, vice president of National Semiconductor’s Portable Power Products Group.  “National continues to lead the market with the introduction of three more products into an already successful family of backlight drivers.”

Key Technical Specifications of National’s New White LED Drivers
All three charge-pump-based white LED drivers are ideal for display backlighting and operate from an extended Li-Ion input voltage range of 2.7 V to 5.5 V. The voltage boost is achieved with a high-efficiency 3/2x gain charge pump.  Packaged in a tiny 18-bump micro SMD, each white LED driver features pulse-width-modulation (PWM) brightness control.

The LM27953 drives four LEDs for display backlighting or other LED lighting applications.  The regulated internal current sources deliver excellent brightness matching in all LEDs by providing low-side current drivers to accommodate common-anode-type LEDs.  The brightness of the LEDs can be adjusted independently with an external resistor.

The LM2796 drives up to seven LEDs in parallel with up to 20 mA of current through each LED.  The regulated internal current sources deliver excellent current and brightness matching in all LEDs. The LED driver current sources are divided into two independently controlled, high-side driven groups.  The primary four-LED group can be used to backlight up to a 2.5-inch display, while the secondary three-LED group can be used to backlight a second display or provide other LED lighting features.

The current sources of the LM27961 are divided into two independently controlled, high-side and low-side driven groups.  The primary four-LED low-side group can be used to backlight up to a 2.5-inch display, while the secondary three-LED high-side group can be used to backlight a second display or provide other LED lighting features.  The brightness of the two LED groups can be adjusted independently.

About National’s Power Management Products
National Semiconductor is the number one supplier of power management ICs with 12.8 percent market share, according to iSuppli’s 2004 voltage regulator/reference survey.  National’s power management revenue grew 29.7 percent in 2003 over the previous year, compared to 17.3 percent growth for the industry during the same time period.  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's WEBENCH® online design tool allows designers to select a power management 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 LM27953, LM2796 and LM27961 are all available now in tiny chip-scale 18-pin micro SMD packaging.  Priced in 1,000-unit quantities, the LM27953 is $1.20, the LM2796 is $1.60 and the LM27961 is $1.50.  Evaluation boards are also available now.

More information about the products is available at http://www.national.com/pf/LM/LM27953.html, http://www.national.com/pf/LM/LM2796.html and http://www.national.com/pf/LM/LM27961.html.  For more information on National’s power management products, visit http://power.national.com

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-performance 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, PCs and laptops.  The company's analog products are also optimized for numerous applications in a variety of electronics markets, including medical, automotive, industrial and test and measurement.  Headquartered in Santa Clara, California, National reported sales of $1.98 billion for fiscal 2004, which ended May 30, 2004.  Additional company and product information is available at www.national.com