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National Semiconductor Introduces Hysteretic P-FET Buck Controller

Dec 1, 2004

December 1, 2004 - National Semiconductor Corporation (NYSE:NSM) today announced the LM3475, a hysteretic P-FET buck controller designed to support a wide range of high-efficiency applications. The LM3475, available in a very small SOT23-5 package, features a hysteretic control scheme that enables a simple system design with no external compensation, stable operation with a wide range of components and extremely fast transient response. Hysteretic control also provides high-efficiency operation, even at light loads. The P-FET architecture allows for low component count, as well as 100 percent duty cycle and ultra-low dropout operation. 

Typical applications include TFT monitors, automobile PCs, vehicle security navigation systems, notebook standby supplies, battery-powered portable applications and distributed power systems.

Key Features and Benefits

  • Easy-to-use control methodology
  • 0.8 V to VIN adjustable output range
  • High efficiency (90 percent typical)
  • ±0.9 percent feedback voltage (±1.5% percent over -40°C to +125°C temperature range)
  • 100 percent duty cycle capable
  • Maximum operating frequency up to 2 MHz
  • Internal soft-start
  • Enable pin

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 http://power.national.com

Pricing and Availability
National’s LM3475 is priced at $.40 each in 1,000-unit quantities. More information is available at http://www.national.com/pf/LM/LM3475.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