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ATL431LI ACTIVE Low-IQ programmable shunt regulator offered in an ultra-small DQN package Pin-pin functionality which offers improved stability boundaries, lower regulation current and also available in smaller packages.
TL431LI ACTIVE Adjustable precision shunt regulator with optimized reference current (pin layout: KRA) Pin-to pin option with improved stability boundaries and lower reference input current to optimize voltage output accuracy.
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Product details

Parameters

VO (V) 2.495 Reference voltage Adjustable Initial accuracy (Max) (%) 0.5, 1, 2 Rating Catalog VO adj (Min) (V) 2.495 VO adj (Max) (V) 36 Iz for regulation (Min) (uA) 400 Temp coeff (Max) (ppm/ degree C) 92 Operating temperature range (C) -40 to 85, -40 to 125, 0 to 70 Iout/Iz (Max) (mA) 100 open-in-new Find other Shunt voltage references

Package | Pins | Size

PDIP (P) 8 93 mm² 9.81 x 9.43 SOIC (D) 8 19 mm² 4.9 x 3.9 SOIC (D) 8 19 mm² 3.91 x 4.9 SOP (PS) 8 48 mm² 6.2 x 7.8 SOT-23 (DBV) 5 5 mm² 2.9 x 1.6 SOT-23 (DBZ) 3 7 mm² 2.92 x 2.37 SOT-89 (PK) 3 18 mm² 4.5 x 4.095 SOT-SC70 (DCK) 6 4 mm² 2 x 2.1 TO-92 (LP) 3 19 mm² 5.2 x 3.68 TSSOP (PW) 8 19 mm² 3 x 6.4 open-in-new Find other Shunt voltage references

Features

  • 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

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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.

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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet TL431 / TL432 Precision Programmable Reference datasheet (Rev. P) Nov. 14, 2018
White papers Designing a Compact Signal Chain for High Performance in Small Spaces Jul. 31, 2020
Technical articles Overcoming common design challenges in an UV sterilization box system Jul. 27, 2020
Technical articles How modern voltage references help shrink small designs Jun. 01, 2020
Application notes Using the TL431 for Undervoltage and Overvoltage Detection (Rev. A) Dec. 11, 2019
Selection guides 431 Device Nomenclature (Rev. B) Sep. 18, 2019
Application notes Designing With the Improved TL431LI (Rev. A) Jun. 28, 2019
White papers Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun. 28, 2019
White papers Voltage reference selection basics white paper (Rev. A) Oct. 23, 2018
Application notes TL431 Pin FMEA Jan. 12, 2018
Application notes Low Cost Bidirectional Current Sensing Using INA181 Jul. 28, 2017
White papers Tips and tricks for designing with voltage references May 30, 2017
Technical articles Differences between PSR and SSR in bias power-supply design Apr. 08, 2016
Technical articles The great compromise: voltage references Dec. 07, 2015
Application notes Designing Overcurrent protection for TPL7407L Peripheral Driver Nov. 05, 2014
Application notes Low-cost flyback solutions for 10-mW standby power Jan. 22, 2014
Application notes Understanding stability boundary conditions charts in TL431, TL432 Data sheet (Rev. A) Jan. 16, 2014
Application notes Lead-Acid Charger and LED Driver using TPS5402 (Rev. A) Jun. 13, 2013
User guides 200-VA HF Inverter Design Based on UCD8220 and MSP430G2330 for Automotive Apps Mar. 07, 2013
Application notes Compensation Design with TL431 for UCC28600 Jan. 16, 2013
Application notes Setting the shunt voltage on an adjustable shunt regulator Sep. 01, 2011
User guides A 90-W High-Efficiency, LLC Series-Resonant Converter Nov. 03, 2010
Application notes Q1 2009 Issue Analog Applications Journal Mar. 11, 2009
Application notes Using a portable-power boost converter in an isolated flyback application Mar. 11, 2009
Application notes Designing Switching Voltage Regulators With the TL494 (Rev. E) Jul. 26, 2005

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
10
Description

The ATL431EVM-001 evaluation module (EVM) features the functionality and adjustability of the ATL431 by letting you program the cathode voltage with various resistor values. You can also set the cathode current using the various resistors in series with the supply (...)

Features
  • Adjustable regulated output from 2.5 V to 36 V 
  • Very-low operating current: IKA(min) = 35 µA (max) and IREF = 150 nA (max)
  • Extended cathode current range from 35 µA to 100 mA
  • Low output impedance of 0.3 Ω (max)
  • Small form factor
  • Ease of use
  • Multiple gain setting options
  • Stability test availability

Design tools & simulation

SIMULATION MODELS Download
SLOJ174.ZIP (0 KB) - Spice Model
SIMULATION MODELS Download
SLVM071B.ZIP (130 KB) - PSpice Model
SIMULATION MODELS Download
SLVM163.ZIP (4 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SLVM164.TSC (82 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SLVM165.TSC (65 KB) - TINA-TI Reference Design
SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
CALCULATION TOOLS Download
TL431 component calculator
TL431CALC The TL431CALC spreadsheet calculates all component parameters for any desired output voltage for the TL43x, TLV43x and TL1431. The spreadsheet includes limits for each device. Resistor values are calculated to the nearest 1% value.
CALCULATION TOOLS Download
SLVC093.ZIP (58 KB)

Reference designs

Many TI reference designs include the TL431 Use our reference design selection tool to review and identify designs that best match your application and parameters.

CAD/CAE symbols

Package Pins Download
PDIP (P) 8 View options
SC70 (DCK) 6 View options
SO (PS) 8 View options
SOIC (D) 8 View options
SOT-23 (DBV) 5 View options
SOT-23 (DBZ) 3 View options
SOT-89 (PK) 3 View options
TO-92 (LP) 3 View options
TSSOP (PW) 8 View options

Ordering & quality