LM431 Adjustable Precision Zener Shunt Regulator LM431 3-terminal

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LM431 Adjustable Precision Zener Shunt Regulator LM431 3-terminal

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LM431 Adjustable Precision Zener Shunt Regulator
LM431 Adjustable Precision Zener Shunt Regulator
LM431 3-terminal adjustable shunt regulator with guaranteed temperature stability over entire temperature range operation. available chip sized package (4-Bump micro SMD) using National's micro package technology. output voltage level greater than 2.5V (VREF) merely selecting external resistors that voltage divided network. sharp turn-on characteristics this device excellent replacement many zener diode applications.
Features
Average temperature coefficient ppm/°C Temperature compensated operation over full temperature range Programmable output voltage Fast turn-on response output noise LM431 micro package AN-1112 micro considerations
Connection Diagrams
TO-92: Plastic Package SOT-23: 3-Lead Small Outline
01005528 01005501
View 4-Bump micro
View SO-8: 8-Pin Surface Mount
01005554 01005502
view
View (bump side down)
Note: internally connected. Must electrically isolated from rest circuit microSMD package.
2005 National Semiconductor Corporation
DS010055
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LM431
Ordering Information
Package Typical Accuracy Order Number/Package Marking 0.5% TO-92 LM431CCZ/ LM431CCZ LM431CIZ/ LM431CIZ SO-8 LM431CCM/ 431CCM LM431CCMX/ 431CCM LM431CIM/ 431CIM LM431CIMX/ 431CIM SOT-23 LM431CCM3/ LM431BCZ/ LM431BCZ LM431BIZ/ LM431BIZ LM431BCM/ 431BCM LM431ACZ/ LM431ACZ LM431AIZ/ LM431AIZ LM431ACM/ LM431ACM +70°C Rails -40°C +85°C Rails +70°C Tape Reel M08A Rails -40°C +85°C Tape &Reel Rails +70°C Tape Reel MF03A Rails -40°C +85°C Tape &Reel Units Tape Reel Units Tape Reel Z03A Temperature Range Transport Media Drawing
LM431BCMX/ LM431ACMX/ 431BCM LM431ACM LM431BIM/ 431BIM LM431BIMX/ 431BIM LM431AIM/ LM431AIM LM431AIMX/ LM431AIM
LM431BCM3/ LM431ACM3/
LM431CCM3X/ LM431BCM3X/ LM431ACM3X/ LM431CIM3 LM431CIM3X micro LM431BIM3 LM431AIM3
LM431BIM3X LM431AIM3X LM431AIBP LM431AIBPX (Note
-40°C +85°C
BPA04AFB
Note micro package marking digit manufacturing Date Code only
micro View Marking Example
01005556
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LM431
Symbol Functional Diagrams
01005599
01005555
Test Circuits
01005504
FIGURE Test Circuit VREF
01005505
Note:
VREF R1/R2) IREF
FIGURE Test Circuit VREF
01005506
Test Circuit Off-State Current
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LM431
Absolute Maximum Ratings (Note
Military/Aerospace specified devices required, please contact National Semiconductor Sales Office/ Distributors availability specifications. Storage Temperature Range Operating Temperature Range Industrial (LM431xI) Commercial (LM431xC) Soldering Information Infrared Convection sec.) Wave Soldering sec.) Cathode Voltage Continuous Cathode Current 235°C 260°C (lead temp.) +150 -40°C +85°C +70°C -65°C +150°C
Reference Voltage Reference Input Current Internal Power Dissipation (Notes TO-92 Package SO-8 Package SOT-23 Package micro Package Operating Conditions Cathode Voltage Cathode Current VREF
-0.5V
0.78W 0.81W 0.28W 0.30W
LM431 Electrical Characteristics
25°C unless otherwise specified Symbol VREF Parameter Reference Voltage Conditions VREF, LM431A (Figure VREF, LM431B (Figure VREF, LM431C (Figure VDEV Deviation Reference Input Voltage Over Temperature (Note Ratio Change Reference Voltage Change Cathode Voltage IREF IREF Reference Input Current Deviation Reference Input Current over Temperature IZ(MIN) IZ(OFF) Minimum Cathode Current Regulation Off-State Current Dynamic Output Impedance (Note VREF, Full Range (Figure (Figure from VREF from -1.4 -1.0 -2.7 -2.0 mV/V 2.485 2.500 2.510 2.470 2.495 2.520 2.440 2.495 2.550 Units
(Figure Full Range (Figure VREF (Figure 36V, VREF (Figure TARGET VREF, LM431A, Frequency (Figure VREF, LM431B, LM431C Frequency (Figure
0.75 0.50
Note Absolute Maximum Ratings indicate limits beyond which damage device occur. Electrical specifications apply when operating device beyond rated operating conditions. Note 150°C. Note Ratings apply ambient temperature 25°C. Above this temperature, derate TO-92 mW/°C, SO-8 mW/°C, SOT-23 mW/°C micro 3mW/°C. Note Deviation reference input voltage, VDEV, defined maximum variation reference input voltage over full temperature range.
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LM431
LM431 Electrical Characteristics
(Continued)
01005507
average temperature coefficient reference input voltage, VREF, defined
Where: full temperature change (0-70°C). VREF positive negative depending whether slope positive negative. Example: VDEV VREF 2495 70°C, slope positive.
Note dynamic output impedance, defined
When device programmed with external resistors, (see Figure dynamic output impedance overall circuit, defined
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LM431
Equivalent Circuit
01005503
Typical Performance Characteristics
Input Current Thermal Information
01005529 01005530
Input Current
Dynamic Impedance Frequency
01005531
01005509
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LM431
Typical Performance Characteristics
Stability Boundary Conditions
(Continued)
01005510
01005511
Note: areas under curves represent conditions that cause device oscillate. curves were adjusted establish initial conditions with were then adjusted determine ranges stability.
Test Circuit Curve Above
Test Circuit Curves Above
01005512
01005513
Typical Applications
Shunt Regulator
Single Supply Comparator with Temperature Compensated Threshold
01005514
01005515
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LM431
Typical Applications
(Continued)
Higher Current Shunt Regulator
Series Regulator
01005518
01005516
Crow
Output Control Three Terminal Fixed Regulator
01005519
01005517
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LM431
Typical Applications
(Continued) Over Voltage/Under Voltage Protection Circuit
01005520
Voltage Monitor
01005521
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LM431
Typical Applications
Delay Timer
(Continued)
Current Limiter Current Source
01005523
01005522
Constant Current Sink
01005524
Application Info
Mounting ensure that geometry micro package maintains good physical contact with printed circuit board, (NC) must soldered pcb. Please AN-1112 more detailed information regarding board mounting techniques micro package.
LM431 micro Light Sensitivity When LM431 micro package exposed bright sunlight, normal office fluorescent light, other LED's lasers, operates within guaranteed limits specified electrical characteristics table.
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LM431
Physical Dimensions
inches (millimeters) unless otherwise noted
8-Pin SOIC Package Number M08A
SOT-23 Molded Small Outline Transistor Package (M3) Package Number MF03A
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LM431
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
Package Number Z03A
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LM431 Adjustable Precision Zener Shunt Regulator
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
NOTES: UNLESS OTHERWISE SPECIFIED EPOXY COATING 63Sn/37Pb EUTECTIC BUMP RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD. ESTABLISHED LOWER LEFT CORNER WITH RESPECT TEXT ORIENTATION. REMAINING PINS NUMBERED. DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE PACKAGE WIDTH, PACKAGE LENGTH PACKAGE HEIGHT. REFERENCE JEDEC REGISTRATION MO-211, VARIATION
4-Bump micro 0.777 0.904 0.850 Package Number BPA04AFB
National does assume responsibility circuitry described, circuit patent licenses implied National reserves right time without notice change said circuitry specifications. most current product information visit www.national.com. LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT GENERAL COUNSEL NATIONAL SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices systems which, intended surgical implant into body, support sustain life, whose failure perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user. BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products uses packing materials that meet provisions Customer Products Stewardship Specification (CSP-9-111C2) Banned Substances Materials Interest Specification (CSP-9-111S2) contain ``Banned Substances'' defined CSP-9-111S2.
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LM431 Adjustable Precision Zener Shunt Regulator LM431 3-terminal

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