July 2004
LM4050
Precision Micropower Shunt Voltage Reference
n Tolerates capacitive loads
n Fixed reverse breakdown voltages of 2.048V, 2.500V,
4.096V, 5.000V, 8.192V, and 10.000V
General Description
Ideal for space critical applications, 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 de-
sign 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.
Key Specifications (LM4050-2.5)
j
Output voltage tolerance
(A grade, 25˚C)
0.1% (max)
j
Low output noise
(10 Hz to 10 kHz)
41 µVrms(typ)
60 µA to 15 mA
−40˚C to +85˚C
−40˚C to +125˚C
50 ppm/˚C (max)
j
j
j
j
Wide operating current range
Industrial temperature range
Extended temperature range
Low temperature coefficient
The LM4050 utilizes fuse and zener-zap reverse breakdown
voltage trim during wafer sort to ensure that the prime parts
have an accuracy of better than 0.1% (A grade) at 25˚C.
Bandgap reference temperature drift curvature correction
and low dynamic impedance ensure stable reverse break-
down voltage accuracy over a wide range of operating tem-
peratures and currents.
Applications
n Portable, Battery-Powered Equipment
n Data Acquisition Systems
n Instrumentation
All grades and voltage options of the LM4050 are available
in both an industrial temperature range (−40˚C and +85˚C)
and an extended temperature range (−40˚C and +125˚C).
n Process Control
n Energy Management
n Product Testing
n Automotive
Features
n Small packages: SOT-23
n No output capacitor required
n Precision Audio Components
Connection Diagram
SOT-23
10104501
*This pin must be left floating or connected to pin 2.
Top View
See NS Package Number MF03A
© 2004 National Semiconductor Corporation
DS101045
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