Shunt Regulator
LM431L LM431LA LM431LB
Shunt Regulator
General Description
TO-92
SOT-23
• The LM431 Series ICs are low voltage three-terminal
programmable shunt regulators with guaranteed thermal
stability over a full operation range. These monolithic ICs
voltage reference operate as a low temperature coefficient
Zener which is programmable from Vref to 18V with two external
resistors. These devices exhibit a wide operating current range
of 80µA to 50/100mA with a typical dynamic impedance of 0.05 to
0.22Ω. The characteristics of these references make them excellent
replacements for Zener diodes in many applications such as
digital voltmeters, power supplies and op amp circuitry
• The LM431L precision reference is offered in three voltage
tolerance for VREF=1.240V: 1.5%, 1.0% and 0.5%.
SOT-89
SOT-23-5
• These ICs are available in 4 packages: TO-92, SOT-23, SOT-23-5 and SOT-89.
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Features
Applications
• Graphic Card
• Programmable Precise Output Voltage from
1.24V to 16/18V
• PC Motherboard
• Voltage Adapter
• Switching Power Supply
• Charger
• High Stability under Capacitive Load
• Low Temperature Deviation
• Low Dynamic Output Impedance: 0.05 to 0.22Ω Typical
• Operating Current from 80µA to 50/100mA.
• Low Output Noise Voltage
• RoHS Compliance
Rev. A/DX 2007-06-04
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