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 output voltage level greater than (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 Temperature compensated operation over full temperature range Programmable output voltage Fast turn-on response output noise
Connection Diagrams
TO-92 Plastic Package SO-8 8-Pin Surface Mount SOT-23 3-Lead Small Outline
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View Order Number LM431ACM LM431AIM LM431BCM LM431BIM LM431CCM LM431CIM
View Order Number LM431ACM3 LM431AIM3 LM431BCM3 LM431BIM3 LM431CCM3 LM431CIM3
View Order Number LM431ACZ LM431AIZ LM431BCZ LM431BIZ LM431CCZ LM431CIZ
Ordering Information
Package TO-92 SO-8 SOT-23 LM431CCZ LM431CIZ LM431CCM LM431CIM LM431CCM3 LM431CIM3 Typical Accuracy LM431BCZ LM431BIZ LM431BCM LM431BIM LM431BCM3 LM431BIM3 LM431ACZ LM431AIZ LM431ACM LM431AIM LM431ACM3 LM431AIM3 Temperature Range
Table package marking SOT-23
C1996 National Semiconductor Corporation
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RRD-B30M17 Printed
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Absolute Maximum Ratings
Military Aerospace specified devices required please contact National Semiconductor Sales Office Distributors availability specifications Storage Temperature Range Operating Temperature Range Industrial (LM431xI) Commercial (LM431xC)
Cathode Voltage Continuous Cathode Current Reference Voltage Reference Input Current Operating Conditions Cathode Voltage Cathode Current
Lead Temperature TO-92 Package SO-8 Package SOT-23 Package (Soldering Internal Power Dissipation (Notes TO-92 Package SO-8 Package SOT-23 Package
VREF
Note Note Ratings appy ambient temperature Above this temperature derate TO-92 SO-8 SOT-23
LM431 Electrical Characteristics unless otherwise specified
Symbol VREF Parameter Reference Voltage Conditions VREF LM431A (Figure VREF LM431B (Figure VREF LM431C (Figure VDEV DVREF IREF *IREF Deviation Reference Input Voltage Over Temperature (Note Ratio Change Reference Voltage Change Cathode Voltage Reference Input Current Deviation Reference Input Current over Temperature Minimum Cathode Current Regulation Off-State Current Dynamic Output Impedance (Note VREF Full Range (Figure (Figure from VREF from
Units
(Figure Full Range (Figure VREF (Figure VREF (Figure VREF LM431A Frequency (Figure VREF LM431B LM431C Frequency (Figure
IZ(MIN) IZ(OFF)
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LM431 Electrical Characteristics unless otherwise specified (Continued)
Note Deviation reference input voltage VDEV defined maximum variation reference input voltage over full temperature range
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average temperature coefficient reference input voltage *VREF defined
*VREF Where full temperature change
VMax VMin VDEV VREF VREF
*VREF positive negative depending whether slope positive negative Example VDEV VREF 2495 slope positive 2495
*VREF Note dynamic output impedance defined
When device programmed with external resistors (see Figure dynamic output impedance overall circuit defined
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Equivalent Circuit
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Test Circuits
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FIGURE Test Circuit VREF
Note VREF IREF
FIGURE Test Circuit VREF
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FIGURE Test Circuit Off-State Current
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Typical Performance Characteristics
Input Current Thermal Information Input Current
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Dynamic Impedance Frequency
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Stability Boundary Conditions
Note areas under curves represent conditions that cause device oscillate curves were adjusted establish initial conditions with were then adjusted determine ranges stability
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Test Circuit Curve Above
Test Circuit Curves Above
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Typical Applications
Shunt Regulator Single Supply Comparator with Temperature Compensated Threshold
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Series Regulator Output Control Three Terminal Fixed Regulator
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VREF
VREF
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Typical Applications (Continued)
Higher Current Shunt Regulator Crow
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VREF
VLIMIT
VREF
Over Voltage Under Voltage Protection Circuit
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LIMIT HIGH LIMIT
VREF VREF
Voltage Monitor
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LIMIT HIGH LIMIT
VREF VREF
WHEN LIMIT HIGH LIMIT
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Typical Applications (Continued)
Delay Timer Current Limiter Current Source
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VREF
DELAY
VREF
Constant Current Sink
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Recommended Solder Pads SOT-23 Package
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TABLE Package Marking SOT-23 Order Number LM431ACM3 LM431AIM3 LM431BCM3 LM431BIM3 LM431CCM3 LM431CIM3 Mark
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Physical Dimensions inches (millimeters) unless otherwise noted
Order Number LM431ACM LM431AIM Package Number M08A
SOT-23 Molded Small Outline Transistor Package (M3) Order Number LM60BIM3 LM60CIM3 Package Number MA03B
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LM431 Adjustable Precision Zener Shunt Regulator
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Order Number LM431ACZ LM431AIZ Package Number Z03A
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT 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
National Semiconductor Corporation Americas 1(800) 272-9959 1(800) 737-7018 Email support
critical component component life support device system whose failure perform reasonably expected cause failure life support device system affect safety effectiveness
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National does assume responsibility circuitry described circuit patent licenses implied National reserves right time without notice change said circuitry specifications

LM431 Adjustable Precision Zener Shunt Regulator LM431 3-terminal

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