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TL431LI

ACTIVO

Regulador de derivación de precisión ajustable con corriente de referencia optimizada (configuración

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Reemplazo con funcionalidad mejorada del dispositivo comparado
TLA431 ACTIVO Referencia programable de precisión estable totalmente capacitiva con disposición de pines KRA Improved to all load cap stability, improved temperature drift, decreased minimum cathode current

Detalles del producto

Rating Catalog VO (V) 2.495 Initial accuracy (max) (%) 0.5, 1 Iz for regulation (min) (µA) 400 VO adj (min) (V) 2.495 VO adj (max) (V) 36 Reference voltage (V) adjustable Temp coeff (max) (ppm/°C) 63 Operating temperature range (°C) -40 to 125 Iout/Iz (max) (mA) 15
Rating Catalog VO (V) 2.495 Initial accuracy (max) (%) 0.5, 1 Iz for regulation (min) (µA) 400 VO adj (min) (V) 2.495 VO adj (max) (V) 36 Reference voltage (V) adjustable Temp coeff (max) (ppm/°C) 63 Operating temperature range (°C) -40 to 125 Iout/Iz (max) (mA) 15
SOT-23 (DBZ) 3 6.9204 mm² (2.92 mm × 2.37 mm)
  • Reference Voltage Tolerance at 25°C
    • 0.5% (B Grade)
    • 1% (A Grade)
  • Minimum Typical Output Voltage: 2.495 V
  • Adjustable Output Voltage: Vref to 36 V
  • Operation From −40°C to +125°C (Q Temp)
  • Maximum Temperature Drift
    • 10 mV (C Temp)
    • 17 mV (I Temp)
    • 27 mV (Q Temp)
  • 0.3-Ω Typical Output Impedance
  • Sink-Current Capability
    • Imin = 1 mA (max)
    • IKA = 15 mA (max)
  • Reference Input Current IREF: 0.4 µA (max)
  • Deviation of Reference Input Current over Temperature, II(dev): 0.3 µA (max)
  • Reference Voltage Tolerance at 25°C
    • 0.5% (B Grade)
    • 1% (A Grade)
  • Minimum Typical Output Voltage: 2.495 V
  • Adjustable Output Voltage: Vref to 36 V
  • Operation From −40°C to +125°C (Q Temp)
  • Maximum Temperature Drift
    • 10 mV (C Temp)
    • 17 mV (I Temp)
    • 27 mV (Q Temp)
  • 0.3-Ω Typical Output Impedance
  • Sink-Current Capability
    • Imin = 1 mA (max)
    • IKA = 15 mA (max)
  • Reference Input Current IREF: 0.4 µA (max)
  • Deviation of Reference Input Current over Temperature, II(dev): 0.3 µA (max)

The TL431LI device is a three-terminal adjustable shunt regulator, with specified thermal stability over applicable automotive, commercial, and military temperature ranges. The output voltage can be set to any value between Vref (approximately 2.495 V) and 36 V, with two external resistors. These devices have a typical output impedance of 0.3 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. This device is a pin-to-pin alternative to the industry standard TL431, with optimized Iref and IIdev performance. The lower Iref and IIdev values enable designers to achieve higher system accuracy and lower leakage current. The TL432LI device has exactly the same functionality and electrical specifications as the TL431LI device, but has a different pinout for the DBZ package.

The TL431LI device is offered in two grades, with initial tolerances (at 25°C) of 0.5% and 1%, for the B and A grade, respectively. In addition, low output drift versus temperature ensures good stability over the entire temperature range.

The TL43xLIxQ devices are characterized for operation from –40°C to 125°C.

The TL431LI device is a three-terminal adjustable shunt regulator, with specified thermal stability over applicable automotive, commercial, and military temperature ranges. The output voltage can be set to any value between Vref (approximately 2.495 V) and 36 V, with two external resistors. These devices have a typical output impedance of 0.3 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. This device is a pin-to-pin alternative to the industry standard TL431, with optimized Iref and IIdev performance. The lower Iref and IIdev values enable designers to achieve higher system accuracy and lower leakage current. The TL432LI device has exactly the same functionality and electrical specifications as the TL431LI device, but has a different pinout for the DBZ package.

The TL431LI device is offered in two grades, with initial tolerances (at 25°C) of 0.5% and 1%, for the B and A grade, respectively. In addition, low output drift versus temperature ensures good stability over the entire temperature range.

The TL43xLIxQ devices are characterized for operation from –40°C to 125°C.

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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Descargar la versión más reciente en inglés Fecha
* Hoja de datos TL431LI / TL432LI Programmable Shunt Regulator with Optimized Reference Current datasheet (Rev. A) PDF | HTML 12/11/2018
Nota sobre la aplicación Precision Current Sources and Sinks Using Voltage References (Rev. A) PDF | HTML 15/04/2026
Artículo técnico Make sure your optocoupler is properly biased PDF | HTML 16/02/2024
Nota sobre la aplicación Voltage Reference Selection and Design Tips For Data Converters (Rev. B) PDF | HTML 9/01/2024
Nota sobre la aplicación Optimization of a Shunt Reference for Flyback Converters PDF | HTML 18/10/2023
Nota sobre la aplicación Designing Stable Isolated Power Supplies with Shunt Regulators PDF | HTML 29/12/2022
Nota sobre la aplicación IEEE 802.3cg 10BASE-T1L Power over Data Lines Powered Device Design (Rev. A) PDF | HTML 2/06/2022
Nota sobre la aplicación Voltage and Processor Monitoring Solutions in Factory Automation and Control App (Rev. A) 5/08/2021
Analog Design Journal High-power, low-cost, discrete linear pre-regulator for automotive rear lights 21/12/2020
Artículo técnico How modern voltage references help shrink small designs PDF | HTML 1/06/2020
Nota sobre la aplicación Using the TL431 for Undervoltage and Overvoltage Detection (Rev. A) 11/12/2019
Guía de selección 431 Device Nomenclature (Rev. B) 18/09/2019
Application brief An Isolated 24 V Power Supply Window Monitor 1/08/2019
Nota sobre la aplicación Designing With the Improved TL431LI (Rev. A) 28/06/2019
Libro electrónico Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28/06/2019

Diseño y desarrollo

Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.

Placa de evaluación

ATL431EVM-001 — Módulo de evaluación del regulador de derivación ajustable ATL431

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. (...)

Guía del usuario: PDF
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Modelo de simulación

TL431LI and ATL431LI PSpice Average Model

SLVMCX5.ZIP (78 KB) - Modelo PSpice
Productos y hardware compatibles
Modelo de simulación

TL431LI and ATL431LI Unencrypted PSpice Average Model

SLVMCX4.ZIP (1 KB) - Modelo PSpice
Productos y hardware compatibles
Modelo de simulación

TL431LI PSpice Transient Model

SLVMCW2.ZIP (56 KB) - Modelo PSpice
Productos y hardware compatibles
Modelo de simulación

TL431LI Unencrypted PSpice Transient Model

SLVMCW1.ZIP (2 KB) - Modelo PSpice
Productos y hardware compatibles
Herramienta de cálculo

SHUNT-REFERENCE-CALC — Shunt Reference Selector and Design Calculator

This tool guides the user through the design process for the TLx431 and LM40x0 family of shunt voltage references. This calculator will recommend resistance and capacitance values to optimally meet the user's desired specifications.
Productos y hardware compatibles

Muchos diseños de referencia de TI incluyen TL431LI

Utilice nuestra herramienta de selección de diseños de referencia para revisar e identificar los diseños que mejor se adaptan a su aplicación y parámetros.

Encapsulado Pines Símbolos CAD, huellas y modelos 3D
SOT-23 (DBZ) 3 Ultra Librarian

Pedidos y calidad

Soporte y capacitación

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