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Product details

Parameters

VO (V) 2.5 Reference voltage Adjustable Initial accuracy (Max) (%) 0.5, 1 Rating Catalog VO adj (Min) (V) 2.5 VO adj (Max) (V) 36 Iz for regulation (Min) (uA) 20 Temp coeff (Max) (ppm/ degree C) 92 Operating temperature range (C) -40 to 125, -40 to 85 Iout/Iz (Max) (mA) 100 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

  • Adjustable Regulated Output of 2.5 V to 36 V
  • Very-Low Operating Current
    • IKA(min) = 35 µA (Max)
    • IREF = 150 nA (Max)
  • Internally Compensated for Stability
    • Stable With No Capacitive Load
  • Reference Voltage Tolerances at 25°C
    • 0.5% for B Grade
    • 1% for A Grade
  • Typical Temperature Drift
    • 5 mV (–40°C to +85°C); I Version
    • 6 mV (–40°C to +125°C); Q Version
  • Extended Cathode Current Range 35 µA to 100 mA
  • Low Output Impedance of 0.3 Ω (Max)
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Description

The ATL431 and ATL432 are three-terminal adjustable shunt regulators, with specified thermal stability over applicable automotive, commercial, and industrial 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 0.05 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 ATL43x has > 20x improvement cathode current range over it’s TL43x predecessor. It also is stable with a wider range of load capacitance types and values.

ATL431 and ATL432 are the exact same parts but with different pinouts and order numbers. The ATL43x is offered in two grades, with initial tolerances (at 25°C) of 0.5%, 1%, for the B and A grade, respectively. In addition, low output drift vs temperature ensures consistent voltage regulation over the entire temperature range.

The ATL43xxI devices are characterized for operation from –40°C to +85°C, and the ATL43xxQ devices are characterized for operation from –40°C to +125°C.

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ATL432LI ACTIVE High-bandwidth, low-IQ programmable shunt regulator (pinout: RKA) The ATL432LI low-Iq adjustable shunt reference offers higher bandwidth

Technical documentation

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Type Title Date
* Datasheet ATL431, ATL432 2.5-V Low Iq Adjustable Precision Shunt Regulator datasheet (Rev. D) Oct. 20, 2016
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
White papers Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun. 28, 2019
White papers Tips and tricks for designing with voltage references May 30, 2017
Technical articles Designing for isolated DC/DC converter shunt safety Aug. 29, 2015

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
$10.00
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
SLVMAT1B.ZIP (59 KB) - PSpice Model
SIMULATION MODELS Download
SLVMAT2B.ZIP (59 KB) - PSpice Model
SIMULATION MODELS Download
SLVMBN8.ZIP (1 KB) - PSpice Model
SIMULATION MODELS Download
SLVMBN9.ZIP (1 KB) - PSpice Model

CAD/CAE symbols

Package Pins Download
SOT-23 (DBZ) 3 View options

Ordering & quality

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