Zener Diode

Voltage Reference for Battery Powered Circuits Schematic Circuit Diagram

The LM4050 from National Semiconductor is a high precision micropower shunt voltage reference in a sub-miniature, surface-mount, three pin, SOT-23 package. The unit operates in the industrial temperature range of –40°C to +85°C. The design eliminates the need for an external stabilizing capacitor and is at the same time stable when operated into any capacitive load. The unit is available in several different, fixed reverse breakdown voltage from 2.500 V, 4.096 V, 5.000 V, 8.192 V to 10.000 V. The minimum operating current ranges from 60 µA for the LM4050-2.5 to 100 µA for the LM4050-10.0 this, along with its tiny outline, makes it ideal for use in battery-powered applications. The LM4050 is available in three different grades of the accuracy of 0.1%, 0.2%, and 0.5%, all have a low-temperature coefficient of less than 50 ppm/°C.

Voltage Reference for Battery Powered Circuits Schematic Circuit Diagram

During the manufacturing process, the use of fuse and Zener-zap reverse breakdown voltage trimming ensures that the premium (or A grade) components have an accuracy of better than ± 0,1% at 25°C. Stable reverse breakdown accuracy over a wide range of temperatures and operating currents is achieved by bandgap reference temperature drift curvature correction and a low dynamic impedance. Altogether this is a versatile component with an impressive specifications. The full data sheet is available from the website: www.national.com

the LM4050 precision voltage reference is available in the sub-miniature (3 mm x 1.3 mm) SOT-23 surface-mount package. The LM4050’s design eliminates the need for an external stabilizing capacitor while ensuring stability with any capacitive load, thus making the LM4050 easy to use. Further reducing design effort is the availability of several fixed reverse breakdown voltages: 2.048V, 2.500V, 4.096V, 5.000V, 8.192V, and 10.000V. The minimum operating current increases from 60 µA for the LM4050-2.0 to 100 µA for the LM4050-10.0. All versions have a maximum operating current of 15 mA.


  • Portable, Battery-Powered Equipment
  • Data Acquisition Systems
  • Instrumentation
  • Process Control
  • Energy Management
  • Product Testing
  • Automotive

Key Specifications (LM4050-2.5)

  • Output voltage tolerance
  • (A grade, 25˚C) ±0.1% (max)
  • Low output noise
  • (10 Hz to 10 kHz) 41 µVrms(typ)
  • Wide operating current range 60 µA to 15 mA
  • Industrial temperature range −40˚C to +85˚C
  • Extended temperature range −40˚C to +125˚C
  • Low-temperature coefficient 50 ppm/˚C (max)

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