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National Semiconductor Introduces Precision Voltage Reference Available in Five Accuracy Grades for Design Flexibility

Dec 1, 2005

December 1, 2005 - National Semiconductor Corporation (NYSE: NSM) today introduced the LM4132, a precision voltage reference available in five accuracy grades, A, B, C, D and E, for greater design flexibility.  The grade A device has an initial accuracy of 0.05 percent, with a guaranteed temperature coefficient of 10 ppm per degrees C or less, while the grade E device has an initial accuracy of 0.5 percent and a temperature coefficient of 30ppm per degrees C.

The  LM4132 performs like the best laser-trimmed bipolar references, but is manufactured in CMOS technology.  This performance is made possible by the use of EEPROM registers for correction of curvature, temperature coefficient and accuracy on a CMOS bandgap architecture that allows package-level programming to overcome assembly shift.  This is a shift in voltage accuracy and temperature coefficient that occurs during assembly of die into plastic packages and limits the accuracy of references trimmed with laser techniques.

Unlike other LDO references, the LM4132 is capable of delivering up to 20 mA of output current and does not require an output capacitor or buffer amplifier. These advantages and the SOT23-5 packaging are important in space-constrained applications.

Series references provide lower power consumption than shunt references, since they do not have to idle the maximum possible load current under no-load conditions. This advantage, combined with a low quiescent current of 60 µA and a low dropout voltage of 400 mV, make the LM4132 ideal for battery-powered solutions.

About the LM4132
The LM4132 reference includes the following features:

  • Output initial voltage accuracy of 0.05 percent for the most accurate grade  
  • Low temperature coefficient of 10 ppm per degrees C for the most accurate grade  
  • Low supply current of 60 µA   
  • Enable pin that allows a 3 µA shutdown mode   
  • 20 mA output current  
  • Voltage options of 2.048V, 2.5V and 4.096V  
  • Custom voltage options available from 1.8V to 4.096V   
  • VIN range of VREF of +400 mV to 5.5V at 10 mA   
  • Stable with low ESR ceramic capacitors

Pricing and Availability
Available now, the LM4132 starts at $1.35 in 1,000-unit quantities.  For more information about the LM4132, including how to order samples, please visit http://www.national.com/pf/LM/LM4132.html.

About National’s Power Management Products
National Semiconductor is the number one supplier of power management ICs with 14.1 percent market share, according to iSuppli’s 2005 voltage regulator/reference survey.  National’s power management revenue grew 37.3 percent in 2004 over the previous year, compared to 24 percent growth for the industry.  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 also offers online tools that enable power designers to select the best power management chips for their applications.  National's Webench® design tool allows designers to choose a 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
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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
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