LM431 Datasheet, PDF (1/14 Pages) National Semiconductor (TI) – Adjustable Precision Zener Shunt Regulator

Shunt Regulator
LM431 LM431A LM431B
Shunt Regulator
General Description
• The LM431 Series ICs are three-terminal programmable
shunt regulators with guaranteed thermal stability over a
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SOT-23
full operation range. These monolithic ICs voltage reference
operate as a low temperature coefficient Zener which is
programmable from Vref to 36V with two external resistors.
These devices exhibit a wide operating current range of 1.0 to
100mA with a typical dynamic impedance of 0.15 to 0.22Ω. The
characteristics of these references make them excellent
SOT-23-5
SOP-8
replacements for Zener diodes in many applications such as
digital voltmeters, power supplies and op amp circuitry
The 2.5V reference makes it convenient to obtain a stable
reference from 5.0V logic supplies, and since the LM431 series
operates as a shunt regulator, it can be used as either a positive or
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negative voltage reference.
• The output voltage of both types can be set to any value between VREF (2.5V) and the corresponding
maximum cathode voltage.
.
Features
Applications
• Programmable Precise Output Voltage from
2.5V to 36V
• High Stability under Capacitive Load
• Low Temperature Deviation
• Can be used in either positive or negative
Voltage reference
• Low Dynamic Output Impedance: 0.15 to 0.22Ω Typical
• Operating Current from 1.0mA to 100mA
• Low Output Noise Voltage
• RoHS Compliance
• Charger
• Voltage Adapter
• Switching Power Supply
• Graphic Card
• Precision Voltage Reference
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Rev. A/DX 2007-06-04
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