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TLV431A

ACTIVE
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1% accuracy, low-voltage, adjustable precision shunt regulator

Data sheet
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1% accuracy, low-voltage, adjustable precision shunt regulator

TLV431A

ACTIVE
Data sheet Order now

Product details

Parameters

VO (V) 1.24 Reference voltage Adjustable Initial accuracy (Max) (%) 1 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

SOIC (D) 8 19 mm² 3.91 x 4.9 SOT-23 (DBV) 5 5 mm² 2.9 x 1.6 SOT-23 (DBV) 5 5 mm² 2.926 x 1.626 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 but is not pin-for-pin or parametrically equivalent to the compared device:
TLVH432A ACTIVE 1% low-voltage wide-operating current adjustable precision shunt regulator (reverse pinout) It offers a wider range for Vout (18V max) and Iz (80mA max), as well as different pinouts for SOT23-3 & SOT-89 packages.
Same functionality and pinout but is not an equivalent to the compared device:
TLVH431A ACTIVE 1% low-voltage wide-operating current adjustable precision shunt regulator It offers a wider range for Vout (18V max) and Iz (80mA max).

Technical documentation

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No results found. Please clear your search and try again. View all 4
Type Title Date
* Datasheet TLV431x Low-Voltage Adjustable Precision Shunt Regulator datasheet (Rev. X) May 01, 2018
More literature Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun. 28, 2019
Selection guides Voltage Reference Overview Jul. 26, 2013
Application notes Supplying TPS61200 With a Single Solar Cell (Rev. B) Sep. 06, 2011

Design & development

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Design tools & simulation

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Design files
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Class 2- Low Cost 3.3V/1.8A Flyback Converter for PoE Applications
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Design files
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36Vdc-72Vdc Input, 1.2V/25A Active Clamp Forward
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36VDC-75VDC Input, 3.3V/30A 1/8th Brick Active Clamp Forward
PMP4234 — This reference design generates an isolated 3.3V/10A output from a standard 48V telecom bus input. The UCC2897A is used to control an active clamp forward topology with self-driven synchronous rectifiers. The electrical components fit into the area of a standard 1/8th brick footprint. Peak (...)
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Isolated Flyback that generates - 48 Vin, 20Vout at 3A
PMP4696 — 60W isolated telecom flyback, 20V @3A
Design files
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195VAC - 265VAC in, 4.5V@ 4.5A out
PMP5512 — The "cascode" topology associated to a quasi-resonant isolated Flyback and synchronous rectification on output allow this converter to show small form factor and high performance. From high line input to 4.5V @ 4.5A.
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Isolated discontinuous mode isolated flyback 3.3V @ 1.5A
PMP6516 — This compact and low-cost (5W) isolated flyback regulator produces a 3.3V output from a 48V input, such as Telecom. A full-load efficiency of 82% was achieved from a 48V nominal input.
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REFERENCE DESIGNS Download
Flyback 5V@0.6A
PMP5192 — The PMP5192 reference design uses the UCC28600 green-mode controller to generate a 5V/2.5W output. The quasi-resonant switching of the UCC28600 allows this low-cost design to achieve efficiencies up to 80%, while the no load losses are less than 100mW.

CAD/CAE symbols

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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

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Posted: 07-Jan-2018
Duration: 05:53

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