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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 0.22. 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
SOT-23-5
SOP-8
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
* 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 0.22 Typical Operating Current from 1.0mA to 100mA Low Output Noise Voltage RoHS Compliance
Applications
* * * * * Charger Voltage Adapter Switching Power Supply Graphic Card Precision Voltage Reference
TAITRON COMPONENTS INCORPORATED www.taitroncomponents.com
Tel: Fax: (800)-TAITRON (800)-824-8766 (800)-TAITFAX (800)-824-8329 (661)-257-6060 (661)-257-6415
Rev. A/DX 2007-06-04 Page 1 of 14
Shunt Regulator LM431
Ordering Information
Pin Configuration
Outline: Z TO-92
Outline: N SOT-23
Outline: N5 SOT-23-5
Outline: S8 SOP-8
Outline: K SOT-89
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Shunt Regulator LM431
Block Diagram Symbols
Absolute Maximum Ratings (Ta=25 C)
(Full operating ambient temperature range applies unless otherwise noted.) Symbol VKA IKA IREF TJ TOPR TSTG Description Cathode Voltage Cathode Current Range (Continuous) Reference Input Current Range (Continuous) Operating Junction Temperature Operating Temperature Range Storage Temperature Range Z:TO-92 N:SOT-23 PD Power Dissipation N5:SOT-23-5 K: SOT-89 S8: SOP-8 Z:TO-92 N:SOT-23 RthJA Package Thermal Impedance N5:SOT-23-5 K: SOT-89 S8: SOP-8 -40 ~ 85 700 800 180 160 LM431 LM431A 36 -100 ~ 150 -0.05 ~ 10 150 -40 ~ 125 -65 ~ 150 770 370 370 770 770 150 330 250 50 150 C/W mW LM431B Unit V mA mA C C C
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Shunt Regulator LM431
Electrical Characteristics (TA=25C, unless otherwise specified)
Symbol VREF Description
Reference Input Voltage Reference Input Voltage Deviation 0-70 C
LM431
Min. 2.440 Typ. 2.495 Max. 2.550 Min.
LM431A
Typ. 2.500 Max. 2.520 Min.
LM431B
Typ. 2.500 Max. 2.510
Unit
V
Test Circuit
Fig.1
Conditions
VKA=VREF,IKA=10mA
2.480
2.490
-
-
-
-
4.8
8
-
4.5
8 mV Fig.1 (Note1) VKA=VREF,IKA=10mA
VREF
-40-85
C
-
7.0
30
-
4.5
10
-
4.5
10 VKA=10V~ VREF VKA=36V~ 10V
VREF/VKA
Ratio of Change in Reference Input Voltage to Change in Cathode to Anode Voltage Ta=25 C Ta=Topr
-
-1.4
-2.7
-
-1.0
-2.7
-
-1.0
-2.7 mV/V Fig.2 IKA= 10mA
-
-1.0
-2.0
-
-0.5
-2.0
-
-0.5
-2.0
IREF
Referenc e Input Current
-
1.8 -
4.0 6.5
-
0.7 -
4.0 -
-
0.7 -
4.0 A Fig.2
IKA=10mA, R1=10K, R2=
IREF
Reference Input Current Deviation
-
0.8
2.5
-
0.4
1.2
-
0.4
1.2
A
Fig.2
IKA=10mA, R1=10K, R2=,
-40 ~ 85 C
VKA=VREF
IMIN IOFF ZKA
Min. Cathode Current For Regulation Off-State Cathode Current Dynamic Impedance
-
0.5
1.0
-
0.4
1.0
-
0.4
1.0
mA
Fig.1
-
2.6 0.22
1000 -
-
50 0.15
1000 0.5
-
50 0.15
1000 0.5
nA
Fig.3 Fig.1 (Note2)
VKA=36V, VREF=0V VKA=VREF, IKA=1.0~100mA, f1.0KHz
Fig.1- Test Circuit for VKA=VREF
Fig.2- Test Circuit for VKA>VREF
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Shunt Regulator LM431
Fig.3- Test Circuit for IOFF
Note1:
Note2:
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Shunt Regulator LM431
Typical Characteristics Curves
Fig.4- IK - VKA Fig.5- IK - VKA
Cathode Current IK (mA)
Cathode Current IK (A)
Cathode Voltage VKA (V)
Cathode Voltage VKA (V)
Fig.6- VREF - VKA
Fig.7- ZKA - f
Cathode Voltage VKA (V)
Dynamic Impedance ZKA ()
Change In Reference Input Voltage VREF (nV)
Frequency f (Hz)
Rev. A/DX 2007-06-04 www.taitroncomponents.com Page 6 of 14
Shunt Regulator LM431
Fig.8- GVO - f Open Loop Voltage Gain GVO (dB) Fig.9- Pulse Response
Voltage Swing (V)
Frequency f (Hz)
Time t (s)
Fig.10- Dynamic Impedance vs. Frequency
Reference Impedance ()
Frequency f (Hz)
Rev. A/DX 2007-06-04 www.taitroncomponents.com Page 7 of 14
Shunt Regulator LM431
Typical Application
Fig.11-Shunt Regulator
Fig.12- High Current Shunt Regulator
Fig.13- Current Source of Current Limit
Rev. A/DX 2007-06-04 www.taitroncomponents.com Page 8 of 14
Shunt Regulator LM431
Typical Application (Continued)
Fig.14- Precision 5V 1.5A Regulator
Fig.15- PWM Converter with Reference
Rev. A/DX 2007-06-04 www.taitroncomponents.com Page 9 of 14
Shunt Regulator LM431
Device Marking Code
Circuit Tolerance Blank LM431 A B 2.20% 0.80% 0.40% SOT-23 (N) 3A EA2 EA1 SOT-23-5 (N5) 3A E3B E3A SOT-89 (K) 3A E43B E43A
Dimensions in inches (mm)
SOP-8
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Shunt Regulator LM431
TO-92
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Shunt Regulator LM431
SOT-23
SOT-23-5
Rev. A/DX 2007-06-04 www.taitroncomponents.com Page 12 of 14
Shunt Regulator LM431
SOT-89
Rev. A/DX 2007-06-04 www.taitroncomponents.com Page 13 of 14
Shunt Regulator LM431
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