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Product details

Parameters

VO (V) 2.495 Reference voltage Adjustable Initial accuracy (Max) (%) 0.5, 1 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) 63 Operating temperature range (C) -40 to 125, 0 to 70, -40 to 85 Iout/Iz (Max) (mA) 15 open-in-new Find other Shunt voltage references

Package | Pins | Size

SOT-23 (DBZ) 3 7 mm² 2.92 x 2.37 open-in-new Find other Shunt voltage references

Features

  • 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)

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Description

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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Technical documentation

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No results found. Please clear your search and try again. View all 8
Type Title Date
* Datasheet TL431LI / TL432LI Programmable Shunt Regulator with Optimized Reference Current datasheet (Rev. A) Nov. 12, 2018
Application notes Using the TL431 for Undervoltage and Overvoltage Detection (Rev. A) Dec. 11, 2019
Application notes Voltage Reference Design Tips For ADC Pairing Nov. 05, 2019
Selection guides 431 Device Nomenclature (Rev. B) Sep. 18, 2019
Application notes An Isolated 24 V Power Supply Window Monitor Aug. 01, 2019
Application notes Designing With the Improved TL431LI (Rev. A) Jun. 28, 2019
More literature Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun. 28, 2019
Application notes Voltage and Processor Monitoring Solutions in Factory Automation and Control App May 02, 2019

Design & development

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Design tools & simulation

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SLVMCW2.ZIP (56 KB) - PSpice Model
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SLVMCX4.ZIP (1 KB) - PSpice Model
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SLVMCX5.ZIP (78 KB) - PSpice Model

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Videos

Shunt Reference Considerations for Flyback Converters with Optocoupler Feedback

Learn how a lower Iref and Ildev can achieve higher output voltage accuracy. See how the new TL431LI is able to achieve these needs.

Posted: 31-Jan-2018
Duration: 07:37

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