Fairchild LM431AIMX Programmable shunt regulator Datasheet

LM431A / LM431B / LM431C
Programmable Shunt Regulator
Features
Description
•
•
•
•
The LM431A / LM431B / LM431C are three-terminal output adjustable regulators with thermal stability over the
full operating temperature range. The output voltage can
be set to any value between VREF (approximately 2.5 V)
and 36 V with two external resistors. These devices have
a typical dynamic output impedance of 0.2 Ω. Active output circuit provides a sharp turn-on characteristic, making these devices excellent replacements for Zener
diodes in many applications.
Programmable Output Voltage to 36 V
Low Dynamic Output Impedance: 0.2 Ω (Typical)
Sink Current Capability: 1.0 to 100 mA
Equivalent Full-Range Temperature Coefficient of
50 ppm/°C (Typical)
• Temperature Compensated for Operation Over Full
Rated Operating Temperature Range
• Low Output Noise Voltage
• Fast Turn-on Response
TO-92
1
1. Ref 2. Anode 3. Cathode
8-SOIC
1
1.Cathode 2.3.6.7.Anode
4.5.NC 8.Ref
Ordering Information
Part Number
Operating
Output Voltage
Temperature
Tolerance
Range
LM431CCZ
Top Mark
0.5%
LM431CCMX
LM431BCZX
LM431BCZXA
LM431BCMX
-25 ~ +85°C
1%
LM431ACZ
LM431ACZX
2%
LM431BIZX
LM431AIZ
-40 ~ +85°C
LM431AIMX
© 2003 Fairchild Semiconductor Corporation
LM431A / LM431B / LM431C Rev. 1.2.0
Packing Method
LM431CCZ
TO-92
Bulk
LM431CCM
8-SOIC
Tape and Reel
LM431BCZ
TO-92
Tape and Reel
LM431BCZ
TO-92
Ammo
LM431BCM
8-SOIC
Tape and Reel
LM431ACZ
TO-92
Bulk
LM431ACZ
TO-92
Tape and Reel
LM431ACM
8-SOIC
Tape and Reel
0.5%
LM431CIM
8-SOIC
Tape and Reel
1%
LM431BIZ
TO-92
Tape and Reel
LM431AIZ
TO-92
Bulk
LM431AIM
8-SOIC
Tape and Reel
LM431ACMX
LM431CIMX
Package
2%
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1
LM431A / LM431B / LM431C — Programmable Shunt Regulator
June 2013
REFERENCE
CATHODE
+
2.5 Ref
ANODE
CATHODE (K)
REFERENCE (R)
ANODE (A)
Figure 1. Block Diagram
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only. Values are at TA = 25°C unless otherwise noted.
Symbol
Parameter
Value
Unit
VKA
Cathode Voltage
37
V
IKA
Cathode Current Range (Continuous)
-100 ~ +150
mA
IREF
Reference Input Current Range
-0.05 ~ +10
mA
770
mW
160
°C/W
Operating Temperature Range LM431xC
-25 ~ +85
°C
Operating Temperature Range LM431xI
-40 ~ +85
°C
150
°C
-65 ~ +150
°C
PD
RθjA
TOPR
TJ
TSTG
Power Dissipation
TO-92, 8-SOIC Packages
Thermal Resistance, Junction to Ambient
TO-92, 8-SOIC Packages
Junction Temperature
Storage Temperature Range
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
Parameter
Min.
Max.
Unit
VKA
Cathode Voltage
VRef
36
V
IKA
Cathode Current
1.0
100
mA
© 2003 Fairchild Semiconductor Corporation
LM431A / LM431B / LM431C Rev. 1.2.0
www.fairchildsemi.com
2
LM431A / LM431B / LM431C — Programmable Shunt Regulator
Block Diagram
Values are at TA = 25°C unless otherwise noted.
Symbol Parameter
VREF
Conditions
Reference
VKA = VREF,
Input Voltage IKA = 10 mA
ΔVREF/
ΔT
Deviation of
Reference
Input Voltage
OverTemperature
ΔVREF/
ΔVKA
Ratio of
Change in
Reference
Input Voltage IKA =
10 mA
to the
Change in
Cathode
Voltage
LM431A
LM431B
LM431C
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
2.450 2.500 2.550 2.470 2.495 2.520 2.482 2.495 2.508
Unit
V
VKA = VREF,
IKA =10 mA
TMIN ≤ TA ≤ TMAX(1)
4.5
17.0
4.5
17.0
4.5
17.0
ΔVKA =
10V-VREF
-1.0
-2.7
-1.0
-2.7
-1.0
-2.7
ΔVKA =
36V-10V
-0.5
-2.0
-0.5
-2.0
-0.5
-2.0
Reference
IKA = 10 mA,
Input Current R1 =10 kΩ, R2 = ∞
1.5
4.0
1.5
4.0
1.5
4.0
μA
Deviation of
Reference
Input Current
Over Full
Temperature
Range
IKA = 10 mA,
R1 = 10 kΩ, R2 = ∞
TA = Full Range
0.4
1.2
0.4
1.2
0.4
1.2
μA
IKA(MIN)
Minimum
Cathode
Cur-rent for
Regulation
VKA = VREF
0.45
1.00
0.45
1.00
0.45
1.00
mA
IKA(OFF)
Off - Stage
Cathode
Current
VKA = 36 V,
VREF = 0
0.05
1.00
0.05
1.00
0.05
1.00
μA
VKA = VREF,
IKA =1 to 100 mA
f ≥ 1.0 kHz
0.15
0.50
0.15
0.50
0.15
0.50
Ω
IREF
ΔIREF /
ΔT
ZKA
Dynamic
Impedance
mV
mV / V
Note:
1. LM431xC: TMIN = -25°C, TMAX = +85°C.
LM431xI: TMIN = -40°C, TMAX = +85°C.
© 2003 Fairchild Semiconductor Corporation
LM431A / LM431B / LM431C Rev. 1.2.0
www.fairchildsemi.com
3
LM431A / LM431B / LM431C — Programmable Shunt Regulator
Electrical Characteristics
LM431
LM431
Figure 3. Test Circuit for VKA ≥ VREF
Figure 2. Test Circuit for VKA= VREF
LM431
Figure 4. Test Circuit for IKA(OFF)
© 2003 Fairchild Semiconductor Corporation
LM431A / LM431B / LM431C Rev. 1.2.0
www.fairchildsemi.com
4
LM431A / LM431B / LM431C — Programmable Shunt Regulator
Test Circuits
Figure 5. Cathode Current vs. Cathode Voltage
Figure 6. Cathode Current vs. Cathode Voltage
Figure 7. Change In Reference Input Voltage vs.
Cathode Voltage
Figure 8. Dynamic Impedance Frequency
Figure 9. Small Signal Voltage Amplification vs.
Frequency
Figure 10. Pulse Response
© 2003 Fairchild Semiconductor Corporation
LM431A / LM431B / LM431C Rev. 1.2.0
www.fairchildsemi.com
5
LM431A / LM431B / LM431C — Programmable Shunt Regulator
Typical Performance Characteristics
LM431A / LM431B / LM431C — Programmable Shunt Regulator
Typical Performance Characteristics (Continued)
140
A
IK, CATHODE CURRENT(mA)
120
100
A VKA = Vref
B VKA = 5.0 V @ IK = 10mA
C VKA = 10 V @ IK = 10mA
D VKA = 15 V @ IK = 10mA
B
C
o
TA = 25 C
80
60
40
D
20
0
100p
1n
10n
100n
1?
10?
CL, LOAD CAPACITANCE
Figure11. Stability Boundary Conditions
© 2003 Fairchild Semiconductor Corporation
LM431A / LM431B / LM431C Rev. 1.2.0
www.fairchildsemi.com
6
R 

1
V O = V ref  1 + -------
R 2

R 

1
V O =  1 + ------- V
R  ref

2
LM431
R 

1
V O =  1 + ------- V
R  ref

2
LM431
LM431
Figure 12. Shunt Regulator
Figure 13. Output Control for ThreeTerminal Fixed Regulator
LM431
LM431
Figure 15. Current Limit or Current Source
© 2003 Fairchild Semiconductor Corporation
LM431A / LM431B / LM431C Rev. 1.2.0
Figure 14. High-Current Shunt
Regulator
Figure 16. Constant-Current Sink
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7
LM431A / LM431B / LM431C — Programmable Shunt Regulator
Typical Application
LM431A / LM431B / LM431C — Programmable Shunt Regulator
Physical Dimensions
TO-92 Bulk Type
D
D)
DRAWING FILENAME: MKT-ZA03DREV3.
Figure 17. 3-Lead, TO-92, Molded, Standard Straight Lead
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the
warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/.
© 2003 Fairchild Semiconductor Corporation
LM431A / LM431B / LM431C Rev. 1.2.0
www.fairchildsemi.com
8
LM431A / LM431B / LM431C — Programmable Shunt Regulator
Physical Dimensions (Continued)
TO-92 Ammo Type, Tape and Reel Type
D
D)
DRAWING FILENAME: MKT-ZA03FREV2.
Figure 18. 3-Lead, TO-92, Molded, 0.200 in Line Spacing Lead Form
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the
warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/.
For current tape and reel specifications, visit Fairchild Semiconductor’s online packaging area:
http://www.fairchildsemi.com/products/discrete/pdf/to92_tr.pdf.
© 2003 Fairchild Semiconductor Corporation
LM431A / LM431B / LM431C Rev. 1.2.0
www.fairchildsemi.com
9
LM431A / LM431B / LM431C — Programmable Shunt Regulator
Physical Dimensions (Continued)
8-SOIC
5.00
4.80
A
0.65
3.81
8
5
B
1.75
6.20
5.80
4.00
3.80
1
PIN ONE
INDICATOR
5.60
4
1.27
(0.33)
1.27
0.25
C B A
LAND PATTERN RECOMMENDATION
SEE DETAIL A
0.25
0.10
0.25
0.19
C
1.75 MAX
0.10
0.51
0.33
OPTION A - BEVEL EDGE
0.50 x 45°
0.25
R0.10
GAGE PLANE
R0.10
OPTION B - NO BEVEL EDGE
0.36
NOTES: UNLESS OTHERWISE SPECIFIED
8°
0°
0.90
0.40
A) THIS PACKAGE CONFORMS TO JEDEC
MS-012, VARIATION AA.
B) ALL DIMENSIONS ARE IN MILLIMETERS.
C) DIMENSIONS DO NOT INCLUDE MOLD
FLASH OR BURRS.
D) LANDPATTERN STANDARD: SOIC127P600X175-8M.
E) DRAWING FILENAME: M08Arev14
F) FAIRCHILD SEMICONDUCTOR.
SEATING PLANE
(1.04)
DETAIL A
SCALE: 2:1
Figure 19. 8-Lead, SOIC, JEDEC MS 0-12, 0.150 inch Narrow Body
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the
warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/.
For current tape and reel specifications, visit Fairchild Semiconductor’s online packaging area:
http://www.fairchildsemi.com/products/discrete/pdf/soic8_tr.pdf.
© 2003 Fairchild Semiconductor Corporation
LM431A / LM431B / LM431C Rev. 1.2.0
www.fairchildsemi.com
10
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