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
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
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
negative voltage reference.
TO-92
SOT-23
SOP-8
SOT-23-5
SOT-89
• The output voltage of both types can be set to any value between VREF (2.5V) and the corresponding
maximum cathode voltage.
.
Features
Applications
• Charger
• Programmable Precise Output Voltage from
2.5V to 36V
• Voltage Adapter
• Switching Power Supply
• Graphic Card
• High Stability under Capacitive Load
• Low Temperature Deviation
• Precision Voltage Reference
• 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
Rev. A/DX 2007-06-04
Page 1 of 14
TAITRON COMPONENTS INCORPORATED www.taitroncomponents.com
Tel:
(800)-TAITRON (800)-824-8766 (661)-257-6060
(800)-TAITFAX (800)-824-8329 (661)-257-6415
Fax: