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National Semiconductor Introduces High Power Step-Up DC-DC Converter

Aug 10, 2005

August 10, 2005 - National Semiconductor Corporation (NYSE:NSM) today introduced a high power step-up DC-DC converter that features a wide input voltage range of 2.7V to 7V, a 0.15 ohm internal switch and pin selectable operating frequency.  The LM3224 is ideal for biasing TFT/LCD displays, handheld devices, GSM/CDMA phones, digital cameras, white LED flash/torch and for general boost applications.

The LM3224 converts a typical 3.3V input to multiple outputs of 8V, -8V, and 23V making it ideal for biasing TFT/LCD displays.  The high current switch is also beneficial for driving high current white LEDs in flash applications.  The LM3224 operates at switching frequencies of 615 kHz and 1.25 MHz, allowing for easy filtering and low noise.  An external compensation pin gives the designer flexibility in setting frequency compensation, allowing for the use of small, low ESR ceramic capacitors at the output.  An external soft-start pin allows the designer to control the amount of in-rush current during start-up.

Key Features for LM3224:

  • Higher power version of National’s popular LM2622 step-up DC-DC converter 
  • Soft-start function 
  • Operating input voltage range of 2.7V to 7V 
  • 615 kHz / 1.25 MHz pin selectable frequency operation 
  • Over temperature protection

Packaging, Pricing and Availability
National’s LM3224 is available now.  Packaged in a low-profile MSOP-8, the LM3224 costs 80 cents in quantities of 1,000.  Lead-free package options are also available.  For more information on National’s DC-DC converter products, visit power.national.com.  For more information on the LM3224 or to order samples, visit http://www.national.com/pf/LM/LM3224.html
.  A selection of DC-DC converters is supported by National’s WEBENCH® online design tool.  To explore these solutions, visit http://webench.national.com.

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