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TL431, TL432
SLVS543P – AUGUST 2004 – REVISED NOVEMBER 2018
TL431 / TL432 Precision Programmable Reference
1 Features
•1 Reference Voltage Tolerance at 25°C – 0.5% (B Grade) – 1% (A Grade) – 2% (Standard Grade)
• Adjustable Output Voltage: Vref to 36 V • Operation From −40°C to 125°C • Typical Temperature Drift (TL43xB)
– 6 mV (C Temp) – 14 mV (I Temp, Q Temp) • Low Output Noise • 0.2-Ω Typical Output Impedance • Sink-Current Capability: 1 mA to 100 mA
2 Applications
• Adjustable Voltage and Current Referencing • Secondary Side Regulation in Flyback SMPSs • Zener Replacement • Voltage Monitoring • Comparator with Integrated Reference
Simplified Schematic
Input
VKA IKA
Vref
3 Description
The TL431LI / TL432LI are pin-to-pin alternatives to TL431 / TL432. TL43xLI offers better stability, lower temperature drift (VI(dev)), and lower reference current (Iref) for improved system accuracy.
The TL431 and TL432 devices are three-terminal adjustable shunt regulators, with specified thermal stability over applicable automotive, commercial, and military temperature ranges. 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 output impedance of 0.2 Ω. Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacements for Zener diodes in many applications, such as onboard regulation, adjustable power supplies, and switching power supplies. The TL432 device has exactly the same functionality and electrical specifications as the TL431 device, but has different pinouts for the DBV, DBZ, and PK packages.
Both the TL431 and TL432 devices are offered in three grades, with initial tolerances (at 25°C) of 0.5%, 1%, and 2%, for the B, A, and standard grade, respectively. In addition, low output drift versus temperature ensures good stability over the entire temperature range.
The TL43xxC devices are characterized for operation from 0°C to 70°C, the TL43xxI devices are characterized for operation from –40°C to 85°C, and the TL43xxQ devices are characterized for operation from –40°C to 125°C.
Device Information(1)
PART NUMBER PACKAGE (PIN) BODY SIZE (NOM)
SOT-23-3 (3)
2.90 mm × 1.30 mm
SOT-23-5 (5)
2.90 mm × 1.60 mm
TL43x
SOIC (8)
4.90 mm × 3.90 mm
PDIP (8)
9.50 mm × 6.35 mm
SOP (8)
6.20 mm × 5.30 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
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.
TL431, TL432
SLVS543P – AUGUST 2004 – REVISED NOVEMBER 2018
www.ti.com
Table of Contents
1 Features .................................................................. 1 2 Applications ........................................................... 1 3 Description ............................................................. 1 4 Revision History..................................................... 2 5 Device Comparison Table..................................... 3 6 Pin Configuration and Functions ......................... 4 7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5 7.2 ESD Ratings.............................................................. 5 7.3 Thermal Information .................................................. 5 7.4 Recommended Operating Conditions....................... 5 7.5 Electrical Characteristics, TL431C, TL432C ............. 6 7.6 Electrical Characteristics, TL431I, TL432I ................ 7 7.7 Electrical Characteristics, TL431Q, TL432Q............. 8 7.8 Electrical Characteristics, TL431AC, TL432AC ........ 9 7.9 Electrical Characteristics, TL431AI, TL432AI ......... 10 7.10 Electrical Characteristics, TL431AQ, TL432AQ.... 11 7.11 Electrical Characteristics, TL431BC, TL432BC .... 12 7.12 Electrical Characteristics, TL431BI, TL432BI ....... 13 7.13 Electrical Characteristics, TL431BQ, TL432BQ.... 14 7.14 Typical Characteristics .......................................... 15 8 Parameter Measurement Information ................ 19
9 Detailed Description ............................................ 20 9.1 Overview ................................................................. 20 9.2 Functional Block Diagram ....................................... 20 9.3 Feature Description................................................. 21 9.4 Device Functional Modes........................................ 21
10 Applications and Implementation...................... 22 10.1 Application Information.......................................... 22 10.2 Typical Applications .............................................. 22 10.3 System Ex.