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National Semiconductor Introduces Inductor-free Switched Capacitor White LED Driver with Regulated Output Voltage Options

Jul 27, 2005

July 27, 2005 - National Semiconductor Corporation (NYSE:NSM) today introduced a constant frequency switched capacitor charge pump with regulated output voltage options of 4.5V and 5.0V.  Throughout the input voltage range of 2.8V to 5.5V, the LM2751 provides up to 150 mA of output current and requires only four low-cost ceramic capacitors and no inductors.  Applications for the LM2751 include white LED display and keypad backlights, and general purpose boost or buck-boost voltage regulation.

The LM2751 uses constant frequency pre-regulation to minimize conducted noise on the input and provide a predictable switching frequency.  The switching frequency is programmable to 725 kHz, 300 kHz, 37 kHz or 9.5 kHz.

Key features for the LM2751:

  • Regulated Output Options: 4.5V, 5.0V 
  • Output Voltage Regulated within 3% 
  • Peak Efficiency Over 90% 
  • 150 mA (4.5V) or 80 mA (5.0V) Output Current Capability 
  • Input Voltage Range: 2.8V to 5.5V 
  • Low Input and Output Voltage Ripple 
  • <1µA Typical Shutdown Current 
  • Small Solution Size - NO INDUCTOR REQUIRED 
  • Programmable 725 kHz, 300 kHz, 37 kHz or 9.5 kHz Switching Frequencies

Packaging, Pricing and Availability
National’s LM2751 is available now in a 10-pin LLP® no-pullback package that measures 3 mm by 3 mm by 0.8 mm.  Lead-free package options are also available.  The LM2751 costs $1.10 each in quantities of 1,000.  More information on the LM2751 is available at http://www.national.com/pf/LM/LM2751.html
.  The LM2751 is supported by National’s WEBENCH® online design tool.  To explore this solution, 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