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TL431, TL431A, TL431BTL432, TL432A, TL432B

SLVS543O AUGUST 2004REVISED JANUARY 2015

TL43xx Precision Programmable Reference1 Features 3 Description

The TL431 and TL432 devices are three-terminal1 Reference Voltage Tolerance at 25C

adjustable shunt regulators, with specified thermal 0.5% (B Grade) stability over applicable automotive, commercial, and 1% (A Grade) military temperature ranges. The output voltage can

be set to any value between Vref (approximately 2% (Standard Grade)2.5 V) and 36 V, with two external resistors. These Adjustable Output Voltage: Vref to 36 V devices have a typical output impedance of 0.2 .

Operation From 40C to 125C Active output circuitry provides a very sharp turn-oncharacteristic, making these devices excellent Typical Temperature Drift (TL431B)replacements for Zener diodes in many applications, 6 mV (C Temp)such as onboard regulation, adjustable power

14 mV (I Temp, Q Temp) supplies, and switching power supplies. The TL432 Low Output Noise device has exactly the same functionality and

electrical specifications as the TL431 device, but has 0.2- Typical Output Impedancedifferent pinouts for the DBV, DBZ, and PK packages. Sink-Current Capability: 1 mA to 100 mABoth the TL431 and TL432 devices are offered inthree grades, with initial tolerances (at 25C) of 0.5%,2 Applications 1%, and 2%, for the B, A, and standard grade,

Adjustable Voltage and Current Referencing respectively. In addition, low output drift versustemperature ensures good stability over the entire Secondary Side Regulation in Flyback SMPSstemperature range. Zener ReplacementThe TL43xxC devices are characterized for operation Voltage Monitoringfrom 0C to 70C, the TL43xxI devices are Comparator with Integrated Reference characterized for operation from 40C to 85C, andthe TL43xxQ devices are characterized for operationfrom 40C to 125C.

Device Information(1)PART NUMBER PACKAGE (PIN) BODY SIZE (NOM)

SOT-23-3 (3) 2.90 mm x 1.30 mmSOT-23-5 (5) 2.90 mm x 1.60 mm

TL43xx SOIC (8) 4.90 mm x 3.90 mmPDIP (8) 9.50 mm x 6.35 mmSOP (8) 6.20 mm x 5.30 mm

(1) For all available packages, see the orderable addendum atthe end of the data sheet.

4 Simplified Schematic

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,intellectual property matters and other important disclaimers. PRODUCTION DATA.

http://www.ti.com/product/tl431?qgpn=tl431http://www.ti.com/product/tl431a?qgpn=tl431ahttp://www.ti.com/product/tl431b?qgpn=tl431bhttp://www.ti.com/product/tl432?qgpn=tl432http://www.ti.com/product/tl432a?qgpn=tl432ahttp://www.ti.com/product/tl432b?qgpn=tl432b

TL431, TL431A, TL431BTL432, TL432A, TL432BSLVS543O AUGUST 2004REVISED JANUARY 2015 www.ti.com

Table of Contents1 Features .................................................................. 1 8 Parameter Measurement Information ................ 182 Applications ........................................................... 1 9 Detailed Description ............................................ 19

9.1 Overview ................................................................. 193 Description ............................................................. 19.2 Functional Block Diagram ....................................... 194 Simplified Schematic............................................. 19.3 Feature Description................................................. 205 Revision History..................................................... 29.4 Device Functional Modes........................................ 206 Pin Configuration and Functions ......................... 3

10 Applications and Implementation...................... 217 Specifications......................................................... 410.1 Application Information.......................................... 217.1 Absolute Maximum Ratings ...................................... 410.2 Typical Applications .............................................. 217.2 ESD Ratings.............................................................. 410.3 System Examples ................................................. 267.3 Thermal Information .................................................. 4

11 Power Supply Recommendations ..................... 297.4 Recommended Operating Conditions....................... 412 Layout................................................................... 297.5 Electrical Characteristics, TL431C, TL432C ............. 5

12.1 Layout Guidelines ................................................. 297.6 Electrical Characteristics, TL431I, TL432I ................ 612.2 Layout Example .................................................... 297.7 Electrical Characteristics, TL431Q, TL432Q............. 7

13 Device and Documentation Support ................. 307.8 Electrical Characteristics, TL431AC, TL432AC ........ 813.1 Related Links ........................................................ 307.9 Electrical Characteristics, TL431AI, TL432AI ........... 913.2 Trademarks ........................................................... 307.10 Electrical Characteristics, TL431AQ, TL432AQ.... 1013.3 Electrostatic Discharge Caution............................ 307.11 Electrical Characteristics, TL431BC, TL432BC .... 1113.4 Glossary ................................................................ 307.12 Electrical Characteristics, TL431BI, TL432BI ....... 12

7.13 Electrical Characteristics, TL431BQ, TL432BQ.... 13 14 Mechanical, Packaging, and OrderableInformation ........................................................... 307.14 Typical Characteristics .......................................... 14

5 Revision History

Changes from Revision N (January 2014) to Revision O Page

Added Applications, Device Information table, Pin Functions table, ESD Ratings table, Thermal Information table, ,Feature Description section, Device Functional Modes, Application and Implementation section, Power SupplyRecommendations section, Layout section, Device and Documentation Support section, and Mechanical,Packaging, and Orderable Information section. ..................................................................................................................... 1

Added Applications. ................................................................................................................................................................ 1 Moved Typical Characteristics into Specifications section. ................................................................................................. 14

Changes from Revision M (July 2012) to Revision N Page

Updated document formatting ................................................................................................................................................ 1 Removed Ordering Information table. .................................................................................................................................... 3 Added Application Note links................................................................................................................................................ 21

Changes from Revision K (June 2010) to Revision L Page

Deleted TA values under TEST CONDITIONS for VI(dev) and II(dev) PARAMETERS in the Electrical Characteristics table. .. 5

2 Submit Documentation Feedback Copyright 20042015, Texas Instruments Incorporated

Product Folder Links: TL431 TL431A TL431B TL432 TL432A TL432B

http://www.ti.com/product/tl431?qgpn=tl431http://www.ti.com/product/tl431a?qgpn=tl431ahttp://www.ti.com/product/tl431b?qgpn=tl431bhttp://www.ti.com/product/tl432?qgpn=tl432http://www.ti.com/product/tl432a?qgpn=tl432ahttp://www.ti.com/product/tl432b?qgpn=tl432bhttp://www.ti.comhttp://www.go-dsp.com/forms/techdoc/doc_feedback.htm?litnum=SLVS543O&partnum=TL431http://www.ti.com/product/tl431?qgpn=tl431http://www.ti.com/product/tl431a?qgpn=tl431ahttp://www.ti.com/product/tl431b?qgpn=tl431bhttp://www.ti.com/product/tl432?qgpn=tl432http://www.ti.com/product/tl432a?qgpn=tl432ahttp://www.ti.com/product/tl432b?qgpn=tl432b

1

2

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4

8

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6

5

CATHODE

ANODE

ANODE

NC

REF

ANODE

ANODE

NC

TL431, TL431A, TL431B . . . D (SOIC) PACKAGE

(TOP VIEW)

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2

3

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8

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5

CATHODE

NC

NC

NC

REF

NC

ANODE

NC

TL431, TL431A, TL431B . . . P (PDIP), PS (SOP),

OR PW (TSSOP) PACKAGE

(TOP VIEW)

NC No internal connection

TL431, TL431A, TL431B . . . DBV (SOT-23-5) PACKAGE

(TOP VIEW)

1

2

3

5

4

NC

CATHODE

ANODE

REF

TL431, TL431A, TL431B . . . PK (SOT-89) PACKAGE

(TOP VIEW)

REF

ANODE

CATHODE

Pin 2 is attached to Substrate and must be

connected to ANODE or left open.

NC No internal connection

TL432, TL432A, TL432B . . . DBV (SOT-23-5) PACKAGE

(TOP VIEW)

1

2

3

5

4

NC

ANODE

NC

REF

CATHODE

NC No internal connection

TL431, TL431A, TL431B . . . DBZ (SOT-23-3) PACKAGE

(TOP VIEW)

TL432, TL432A, TL432B . . . DBZ (SOT-23-3) PACKAGE

(TOP VIEW)

NC No internal connection

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2

3

REF

CATHODE

ANODE

1

2

3

CATHODE

REF

ANODE

AN

OD

E

TL432, TL432A, TL432B . . . PK (SOT-89) PACKAGE

(TOP VIEW)

REF

AN