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Product details

Parameters

VO (V) 1.24 Reference voltage Adjustable Initial accuracy (Max) (%) 1.5 Rating Catalog VO adj (Min) (V) 1.24 VO adj (Max) (V) 6 Iz for regulation (Min) (uA) 55 Temp coeff (Max) (ppm/ degree C) 138 Operating temperature range (C) -40 to 125, -40 to 85, 0 to 70 Iout/Iz (Max) (mA) 15 open-in-new Find other Shunt voltage references

Package | Pins | Size

SOT-23 (DBV) 5 5 mm² 2.926 x 1.626 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 TO-92 (LP) 3 19 mm² 5.2 x 3.68 open-in-new Find other Shunt voltage references

Features

  • Low-Voltage Operation, VREF = 1.24 V
  • Adjustable Output Voltage, VO = VREF to 6 V
  • Reference Voltage Tolerances at 25°C
    • 0.5% for TLV431B
    • 1% for TLV431A
    • 1.5% for TLV431
  • Typical Temperature Drift
    • 4 mV (0°C to 70°C)
    • 6 mV (–40°C to 85°C)
    • 11 mV (–40°C to 125°C)
  • Low Operational Cathode Current, 80 µA Typical
  • 0.25-Ω Typical Output Impedance
  • Ultra-Small SC-70 Package Offers 40% Smaller Footprint Than SOT-23-3
  • See TLVH431 and TLVH432 for:
    • Wider VKA (1.24 V to 18 V) and IK (80 mA)
    • Additional SOT-89 Package
    • Multiple Pinouts for SOT-23-3 and SOT-89 Packages
  • On Products Compliant to MIL-PRF-38535,
    All Parameters Are Tested Unless Otherwise Noted. On All Other Products, Production Processing Does Not Necessarily Include Testing of All Parameters.

All trademarks are the property of their respective owners.

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Description

The TLV431 device is a low-voltage 3-terminal adjustable voltage reference with specified thermal stability over applicable industrial and commercial temperature ranges. Output voltage can be set to any value between VREF (1.24 V) and 6 V with two external resistors (see the Parameter Measurement Information section). These devices operate from a lower voltage (1.24 V) than the widely used TL431 and TL1431 shunt-regulator references.

When used with an optocoupler, the TLV431 device is an ideal voltage reference in isolated feedback circuits for 3-V to 3.3-V switching-mode power supplies. These devices have a typical output impedance of 0.25 Ω. Active output circuitry provides a very sharp turnon characteristic, making them excellent replacements for low-voltage Zener diodes in many applications, including on-board regulation and adjustable power supplies.

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Same functionality and pinout but is not an equivalent to the compared device:
TL431 ACTIVE Adjustable precision shunt regulator Wider range for Vout (36V max) and Iz (80mA max), as well as different pinouts for SOT23-3 & SOT-89 packages, Vref=2.495, 2% trim accuracy.
TLVH431 ACTIVE 1.5% low-voltage wide-operating current adjustable precision shunt regulator Wider range for Vout (18V max) and Iz (80mA max), as well as different pinouts for SOT23-3 & SOT-89 packages.
TLVH432 ACTIVE 1.5% low-voltage wide-operating current adjustable precision shunt regulator (reverse pinout) Wider range for Vout (18V max) and Iz (80mA max), as well as different pinouts for SOT23-3 & SOT-89 packages.

Technical documentation

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No results found. Please clear your search and try again. View all 20
Type Title Date
* Datasheet TLV431x Low-Voltage Adjustable Precision Shunt Regulator datasheet (Rev. X) May 01, 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
More literature Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun. 28, 2019
Application notes High-side current sources for industrial applications Mar. 12, 2019
Application notes Window comparator circuit (Rev. A) Feb. 06, 2019
White papers Voltage reference selection basics white paper (Rev. A) Oct. 23, 2018
Application notes Low Cost Bidirectional Current Sensing Using INA181 Jul. 28, 2017
More literature Tips and tricks for designing with voltage references May 30, 2017
Technical articles Digitally select your reference voltage Apr. 27, 2016
Technical articles Understanding Voltage References: Using a Shunt Reference as a Comparator May 12, 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
Technical articles Power Tips: How to Regulate a Low-Voltage, Isolated Supply Jan. 16, 2014
Application notes Supplying TPS61200 With a Single Solar Cell (Rev. B) Sep. 06, 2011
Application notes Setting the shunt voltage on an adjustable shunt regulator Sep. 01, 2011
Application notes Implementing a Buck Converter With the TPS23753A Sep. 20, 2010
User guides Low Cost Isolated Power Supply for PoE Applications May 20, 2003
User guides 10-Watt Flyback Converter Utilizing the UCC3809 (Rev. B) Sep. 14, 2001

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
Description
The PSEMTHR24EVM-081 mother board features 24 port 2pair/4pair PSE system. When paired with the TPS23881EVM-083 48-channel 4-Pair (90W) PSE daughter card or TPS23882EVM-084 24-channel 2-Pair (30W) PSE daughter card and PSEMCUDAUEVM-082 MCU daughter card (sold separately), users can evaluate this (...)
Features
  • 24 port PoE PSE system and expandable to 48 ports
  • Highly flexible system with configurable GUI and host interface
  • Multiport power management
  • IEEE802.3bt compliance
  • Mutiple power supplies
  • Supporting Legacy PD

Design tools & simulation

SIMULATION MODELS Download
SLIM005A.ZIP (161 KB) - PSpice Model
SIMULATION MODELS Download
SLVM088.ZIP (3 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SLVM089.TSC (45 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SLVM090.TSC (80 KB) - TINA-TI Reference Design
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.

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Design files
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REFERENCE DESIGNS Download
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PMP8965 The PMP8965 is a 12.5W USB adapter reference design using the UCC28740 quasi-resonant/discontinues flyback controller, with synchronous rectification to improve efficiency using the UCC24610 Green Rectifier Controller.
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REFERENCE DESIGNS Download
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PMP7174 This design is a compact, low AC line input (Maximum 130Vac) Flyback converter which provides a regulated and fully-isolated 24V@1.45A output. Featuring TI's LM5021 current mode controller working at 135kHz, the converter features fast start-up and delivers greater than 85% efficiency from 30-100 (...)
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REFERENCE DESIGNS Download
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PMP4679 This reference evaluation module, featuring the TPS23750 PoE DC-to-DC controller, is used for class 3 PoE applications where low-cost and high efficiency are required.

The module accepts input voltages between 37-57V ac and output 12V at 0.95A.

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Design files
REFERENCE DESIGNS Download
Class 3 Efficiency-Optimized Flyback Converter for PoE Applications Reference Design
PMP8896 — This converter is used for Class 3 PoE applications where high efficiency is required. The flyback converter with synchronous rectifier provides excellent efficiency and small size for PoE applications. The TPS23753A contains both the PoE Powered Device and the PWM controller functions.
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REFERENCE DESIGNS Download
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REFERENCE DESIGNS Download
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Design files

CAD/CAE symbols

Package Pins Download
SOT-23 (DBV) 5 View options
SOT-23 (DBZ) 3 View options
SOT-89 (PK) 3 View options
TO-92 (LP) 3 View options

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Videos

What is a voltage reference?

Learn more about TI's voltage reference products in this video.

Posted: 05-Jan-2017
Duration: 20:23

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