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LM431

www.ti.com

SNVS020G –MAY 2000–REVISED APRIL 2013

LM431 Adjustable Precision Zener Shunt Regulator

Check for Samples: LM431

FEATURES

DESCRIPTION

The LM431 is a 3-terminal adjustable shunt regulator

• Average Temperature Coefficient 50 ppm/°C

with ensured temperature stability over the entire

• Temperature Compensated for Operation Over

temperature range of operation. The output voltage

the Full Temperature Range

may be set at any level greater than 2.5V (V

REF

) up to

• Programmable Output Voltage

36V merely by selecting two external resistors that

act as a voltage divided network. Due to the sharp

• Fast Turn-On Response

turn-on characteristics this device is an excellent

• Low Output Noise

replacement for many zener diode applications.

Connection Diagram

Figure 1. TO-92: Plastic Package Figure 2. SOT-23: 3-Lead Small Outline

Top View Top View

A. Note: NC = Not internally connected.

Figure 3. SOIC: 8-Pin Surface Mount

Top view

Symbol and Functional Diagrams

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (23 pages)

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LM431 www.ti.com SNVS020G – MAY 2000 – REVISED APRIL 2013 LM431 Adjustable Precision Zener Shunt Regulator Check for Samples: LM431 FEATURES DESCRIPTION • • The LM431 is a 3-terminal adjustable shunt regulator with ensured temperature stability over the entire temperature range of operation. The output voltage may be set at any level greater than 2.5V (VREF) up to 36V merely by selecting two external resistors that act as a voltage divided network.
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LM431 SNVS020G – MAY 2000 – REVISED APRIL 2013 www.ti.com DC Test Circuits Note: VZ = VREF (1 + R1/R2) + IREF• R1 Figure 4. Test Circuit for VZ = VREF Figure 5. Test Circuit for VZ > VREF Figure 6. Test Circuit for Off-State Current These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
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LM431 www.ti.com SNVS020G – MAY 2000 – REVISED APRIL 2013 LM431 Electrical Characteristics TA = 25°C unless otherwise specified Symbol VREF Parameter Conditions Reference Voltage VDEV Deviation of Reference Input Voltage Over Temperature (1) ΔVREF/ΔVZ Ratio of the Change in Reference Voltage to the Change in Cathode Voltage Min Typ Max Units VZ = VREF, II = 10 mA LM431A (Figure 4 ) 2.440 2.495 2.550 V VZ = VREF, II = 10 mA LM431B (Figure 4 ) 2.470 2.495 2.
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LM431 SNVS020G – MAY 2000 – REVISED APRIL 2013 www.ti.
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LM431 www.ti.com SNVS020G – MAY 2000 – REVISED APRIL 2013 Typical Performance Characteristics Input Current vs VZ Thermal Information Figure 7. Figure 8. Input Current vs VZ Dynamic Impedance vs Frequency Figure 9. Figure 10. Stability Boundary Conditions Note: The areas under the curves represent conditions that may cause the device to oscillate. For curves B, C, and D, R2 and V+ were adjusted to establish the initial VZ and IZ conditions with CL = 0.
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LM431 SNVS020G – MAY 2000 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 6 Test Circuit for Curve A Above Test Circuit for Curves B, C and D Above Figure 13. Figure 14.
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LM431 www.ti.com SNVS020G – MAY 2000 – REVISED APRIL 2013 Typical Applications Figure 15. Shunt Regulator Figure 16. Single Supply Comparator with Temperature Compensated Threshold Figure 17.
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LM431 SNVS020G – MAY 2000 – REVISED APRIL 2013 www.ti.com Figure 18. Output Control of a Three Terminal Fixed Regulator Figure 19. Higher Current Shunt Regulator Figure 20.
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LM431 www.ti.com SNVS020G – MAY 2000 – REVISED APRIL 2013 Figure 21. Over Voltage/Under Voltage Protection Circuit Figure 22.
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LM431 SNVS020G – MAY 2000 – REVISED APRIL 2013 www.ti.com Figure 23. Delay Timer Figure 24. Current Limiter or Current Source Figure 25.
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LM431 www.ti.com SNVS020G – MAY 2000 – REVISED APRIL 2013 REVISION HISTORY Changes from Revision F (April 2013) to Revision G • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 4-May-2014 (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) LM431ACM3 SOT-23 DBZ 3 1000 178.0 8.4 LM431ACM3/NOPB SOT-23 DBZ 3 1000 178.0 LM431ACM3X SOT-23 DBZ 3 3000 178.0 LM431ACM3X/NOPB SOT-23 DBZ 3 3000 LM431ACMX SOIC D 8 W Pin1 (mm) Quadrant 3.3 2.9 1.22 4.0 8.0 Q3 8.4 3.3 2.9 1.22 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) LM431BIM3X/NOPB SOT-23 DBZ 3 3000 178.0 8.4 LM431BIMX/NOPB SOIC D 8 2500 330.0 12.4 LM431CCM3/NOPB SOT-23 DBZ 3 1000 178.0 LM431CCM3X SOT-23 DBZ 3 3000 178.0 LM431CCM3X/NOPB SOT-23 DBZ 3 3000 W Pin1 (mm) Quadrant 3.3 2.9 1.22 4.0 8.0 Q3 6.5 5.4 2.0 8.0 12.0 Q1 8.4 3.3 2.9 1.22 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM431AIM3X/NOPB SOT-23 DBZ 3 3000 210.0 185.0 35.0 LM431AIMX/NOPB SOIC D 8 2500 367.0 367.0 35.0 LM431BCM3 SOT-23 DBZ 3 1000 210.0 185.0 35.0 LM431BCM3/NOPB SOT-23 DBZ 3 1000 210.0 185.0 35.0 LM431BCM3X/NOPB SOT-23 DBZ 3 3000 210.0 185.0 35.0 LM431BCMX SOIC D 8 2500 367.0 367.0 35.
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