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National Semiconductor Introduces New Family of Low-Quiescent CMOS Regulators

Feb 23, 2005

February 23, 2005 - National Semiconductor Corporation (NYSE:NSM) today introduced the LP38690, LP38691, LP38692 and LP38693 low dropout CMOS linear regulators.

The LP38690 and LP38692 are designed for load currents of up to 1A, while the LP38691 and LP38693 are tailored for load currents of up to 500mA.  The LP38692 and LP38693 offer an enable option which allows the designer to enable or disable the device, saving on current draw.  In shutdown mode, the device draws a maximum of 1 uA.  In addition, the LP3869x family has a low-quiescent current of 100 uA regardless of load current, input voltage and operating temperature.  Applications for these linear regulators include hard disk drives, notebook computers, battery-powered devices and portable instrumentation. 

Key Features of the LP3869x Family:

  • Low dropout voltage: 250 mV at 500 mA or 450 mV at 1A (typical, 5 V out) 
  • Wide input voltage range (2.7 V to 10 V) 
  • Fixed output voltages of 5.0 V, 3.3 V, 2.5 V, and 1.8 V 
  • Adjustable output voltage range from 1.25 V to 5 V 
  • Stable with 1 uF ceramic capacitors over full load 
  • 100 uA maximum quiescent current over load, voltage and temperature 
  • 1 µA off-state quiescent current 
  • Thermal overload protection 
  • Foldback current limiting

Packaging, Pricing and Availability
The entire LP3869x family is available in the 6-lead LLP® package. In addition, National’s LP38690 and LP38691 are offered in a 3-lead TO252 package, and the LP38692 and LP38693 are offered in a 5-lead SOT23 package.  Depending on package selection, prices for 1,000-unit quantities range from 40 cents to 50 cents. 

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.

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, Calif., National reported sales of $1.98 billion for fiscal 2004, which ended May 30, 2004.  Additional company and product information is available at