LM431AN-R - Taitron Components, Inc.

Adjustable Precision Shunt
Voltage Regulator
LM431AN-R LM431BN-R
Adjustable Precision Shunt Voltage Regulator
General Description
• LM431AN-R and LM431BN-R are three terminal Adjustable Precision Shunt Regulators,
With guaranteed thermal stability over a full temperature range
• The output Voltage of these ICs can be set to any value between VREF (Typical 2.50V)
and the cathode voltage (maximum 36V) with two external resistors. These Devices
feature the sharp turn-on characteristics, low temperature coefficient and low output
impedance, making them ideal substitute for Zener Diode in many applications such
as switching power supplies, charger and other adjustable regulators.
SOT-23
• LM431 precision reference Voltage tolerance is offered in 2 grades:1% for LM431AN-R
and 0.5% for LM431BN-R
• Both LM431AN-R and LM431BN-R are available in SOT-23 package
.
Features
• Programmable Precise Output Voltage from 2.50V to 36V
•
•
•
•
•
•
High Stability under Capacitive Load
Wide Operation Temperature Range:-40°C to 125°C
Low Temperature Deviation:4.5mV (Typical)
Low Equivalent Full-range Temperature Coefficient :20ppm/°C (Typical)
Low Dynamic Output Rresitance:0.15Ω (Typical)
Sink Current Capacity from 1mA to 100mA
• Low Output Noise
• RoHS Compliance and Halogen Free
Applications
•
•
•
•
•
Switching Power Supply
Charger
Voltage Adapter
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/LX
Page 1 of 11
Adjustable Precision Shunt Voltage Regulator
LM431AN-R LM431BN-R
Ordering Information
Pin Configuration
Functional Block Diagram
1: CATHODE 2: REF 3: ANODE
SOT-23
Marking information:
Outline
Temperatue
Range
SOT-23
-40 to 125°C
VREF
Tolerance
PN
Marking Code
Packing Type
1%
LM431AN-R-08-RG70
GB2
Tape & Reel
0.5%
LM431BN-R-08-RG70
GB1
Tape & Reel
Rev. A/LX
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Page 2 of 11
Adjustable Precision Shunt Voltage Regulator
LM431AN-R LM431BN-R
Absolute Maximum Ratings
Symbol
Description
Ratings
Unit
VKA
IKA
IREF
PD
TJ
TSTG
ESD(Human body model)
Cathode Voltage
Cathode Current
Reference Input Current
Power Dissipation
Junction Temperature
Storage Temperature Range
ESD
40
-100 to 150
10
370
150
-65 to 150
2000
V
mA
mA
mW
°C
°C
V
Recommend Operating Ratings(Note1)
Symbol
Description
VKA
IKA
TA
Cathode Voltage
Continuous Cathode Current
Operating Ambient Temperatrue
Ratings
Min
Max
36
VREF
1.0
100
-40
125
Unit
V
mA
°C
Note1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.Recommend
Opertaing ratings indicate conditions for which the devices is functional,but do not guarantee specific specifation
limits. For guarantee specifation and test conditions,see the Electrical Charctristics, the guarantee specifation
apply only for the test conditions listed.Some performance characteristics may degrade when the device is not
operated under the listed test conditions.
Electrical Characteristics (TA=25°C, unless otherwise specified)
Symbol
VREF
Description
Reference
Voltage
0.5%
1%
Min.
Typ.
Max.
Unit
Test
Circuit
Test Conditions
2.487
2.475
-
2.500
2.500
4.5
4.5
4.5
2.512
2.525
8
10
16
V
V
Fig.1
VKA=VREF,IKA=10mA
mV
Fig.1
mV/ V
Fig.2
uA
Fig.2
∆ VREF
Deviation of Reference Voltage
Over Full Temperature Range
∆ VREF
∆ VKA
Ratio of change in Reference
Voltage to the change in
Cathode Voltage
-
-1.0
-2.7
-
-0.5
-2.0
Reference Current
-
0.7
4
IREF
0°C to 70°C
VKA=VREF
-40°C to 85°C
IKA=10mA
-40°C to125°C
∆ VKA=10V to
VREF
IKA=10mA
∆ VKA=36V to
10V
IKA=10mA,R1=10KΩ,R2=∞
Rev. A/LX
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Page 3 of 11
Adjustable Precision Shunt Voltage Regulator
LM431AN-R LM431BN-R
∆ IREF
IKA(Min)
IKA(Off)
|ZKA|
Deviation of Reference Current
Over Full Temperature Range
Minimum Cathode Current for
Regulation
Off-state Cathode Current
Dynamic Impedance
-
0.4
1.2
uA
Fig.2
IKA=10mA, R1=10KΩ,R2=∞
TA =-40°C to125°C
-
0.4
1.0
mA
Fig.1
VKA=VREF
-
0.05
1.0
uA
Fig.3
-
0.15
0.5
Ω
Fig.1
VKA=36V, VREF=0V
VKA=VREF, IKA=1mA to
100mA,f≤1.0KHz
.
Parameter Test Circuit
Fig.1 Test Circuit for VKA=VREF
Fig.2 Test Circuit for VKA>VREF
Fig.3 Test Circuit for IKA(Off)
Rev. A/LX
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Page 4 of 11
Adjustable Precision Shunt Voltage Regulator
LM431AN-R LM431BN-R
Typical Characteristics Curves
Fig.4 VREF-TA
Fig.5 IREF-TA
R1=10K Ω
Reference Current IREF (uA)
Reference Voltage VREF (V)
VKA=VREF
IKA=10mA
Operation Ambient Temperature TA (° C)
R2= ∞
IKA=10mA
Operation Ambient Temperature TA (° C)
VKA=VREF
TA=25 ° C
Cathode Voltage VKA (V)
Fig.7 IKA-VKA
Cathode Current IKA (uA)
Cathode Current IKA (mA)
Fig.6 IKA-VKA
VKA=VREF
TA=25 ° C
Cathode Voltage VKA (V)
Rev. A/LX
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Page 5 of 11
Adjustable Precision Shunt Voltage Regulator
LM431AN-R LM431BN-R
Fig.9
Ratio of change in Reference Voltage
to the change in Cathode Voltage
(mV/V)
Off-State Cathode Current IKA (off) (uA)
( A)
Fig.813 IKA(Off)-TA
VKA=36V
VREF=0V
Operation Ambient Temperature TA (° C)
∆ VREF -TA
∆ VKA
VKA=3.5V to 36V
Operation Ambient Temperature TA (° C)
Fig.10 VG-f
Voltage Gain VG (dB)
TA=25 ° C
IKA=10mA
Small Signal Frequency f (Hz)
Rev. A/LX
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Page 6 of 11
Adjustable Precision Shunt Voltage Regulator
LM431AN-R LM431BN-R
Reference Impedance (Ω)
Fig.11 |ZKA|-f
TA=25 ° C
IKA=10mA
Frequency f (Hz)
Cathode Current IKA (mA)
Fig.12 IKA-CLOAD
Stable
Stable
Load Capacitance CLOAD (uF)
Rev. A/LX
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Page 7 of 11
Adjustable Precision Shunt Voltage Regulator
LM431AN-R LM431BN-R
Output and Input Voltage VOUT/VIN (V)
Fig.13 Pulse Respond of Input and Output Voltage
Input
Output
Time (uS)
Rev. A/LX
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Page 8 of 11
Adjustable Precision Shunt Voltage Regulator
LM431AN-R LM431BN-R
Typical Standard Application Circuit
Fig.14 Shunt Regulator
Fig.16 Current Source or Current Limit
Fig.15 High Current Shunt Regulator
Fig.17 Precision 5V 1 A Regulator
Fig.18 PWM Converter With Reference
Rev. A/LX
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Page 9 of 11
Adjustable Precision Shunt Voltage Regulator
LM431AN-R LM431BN-R
Dimensions in mm (inch)
SOT-23
Rev. A/LX
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Page 10 of 11
Adjustable Precision Shunt Voltage Regulator
LM431AN-R LM431BN-R
How to contact us:
US HEADQUARTERS
28040 WEST HARRISON PARKAWAY, VALENCIA, CA 91355-4162
Tel: (800) TAITRON (800) 824-8766 (661) 257-6060
Fax: (800) TAITFAX (800) 824-8329 (661) 257-6415
Email: [email protected]
Http://www.taitroncomponents.com
TAITRON COMPONENTS MEXICO, S.A .DE C.V.
BOULEVARD CENTRAL 5000 INTERIOR 5 PARQUE INDUSTRIAL ATITALAQUIA, HIDALGO C.P.
42970 MEXICO
Tel: +52-55-5560-1519
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TAITRON COMPONETS INCORPORATED E REPRESENTAÇÕES DO BRASIL LTDA
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Tel: +55-11-5574-7949
Fax: +55-11-5572-0052
TAITRON COMPONETS INCORPORATED, SHANGHAI REPRESENTATIVE OFFICE
METROBANK PLAZA, 1160 WEST YAN’ AN ROAD, SUITE 1503, SHANGHAI, 200052, CHINA
Tel: +86-21-5424-9942
Fax: +86-21-5424-9931
Rev. A/LX
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Page 11 of 11