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ATL431LI ACTIVE Low-IQ programmable shunt regulator offered in an ultra-small DQN package This pin-to-pin upgrade offers improved stability boundaries and lower reference input current to optimize voltage-output accuracy.

Product details

VO (V) 2.5 Reference voltage Adjustable Initial accuracy (Max) (%) 0.5, 1 VO adj (Min) (V) 2.5 VO adj (Max) (V) 36 Iz for regulation (Min) (uA) 20 Rating Catalog Temp coeff (Max) (ppm/ degree C) 92 Operating temperature range (C) -40 to 125, -40 to 85 Iout/Iz (Max) (mA) 100
VO (V) 2.5 Reference voltage Adjustable Initial accuracy (Max) (%) 0.5, 1 VO adj (Min) (V) 2.5 VO adj (Max) (V) 36 Iz for regulation (Min) (uA) 20 Rating Catalog Temp coeff (Max) (ppm/ degree C) 92 Operating temperature range (C) -40 to 125, -40 to 85 Iout/Iz (Max) (mA) 100
SOT-23 (DBZ) 3 7 mm² 2.92 x 2.37
  • 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)
  • 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)

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.

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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Technical documentation

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Type Title Date
* Data sheet ATL431, ATL432 2.5-V Low Iq Adjustable Precision Shunt Regulator datasheet (Rev. D) 20 Oct 2016
E-book Tips and tricks for designing with voltage references (Rev. A) 07 May 2021
Analog design journal High-power, low-cost, discrete linear pre-regulator for automotive rear lights 21 Dec 2020
White paper Simplifying Signal Chain Design for High Performance in Small Systems 22 Oct 2020
Technical article How modern voltage references help shrink small designs 01 Jun 2020
Application note Using the TL431 for Undervoltage and Overvoltage Detection (Rev. A) 11 Dec 2019
Selection guide 431 Device Nomenclature (Rev. B) 18 Sep 2019
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019
Application note Diode-Based Temperature Measurements (Rev. A) 17 May 2019
Technical article How to use a voltage reference as a voltage regulator 04 Dec 2018
Technical article The great compromise: voltage references 07 Dec 2015
Technical article Designing for isolated DC/DC converter shunt safety 29 Aug 2015
User guide ATL431EVM User's Guide 28 Apr 2015
Application note Designing with the Advanced TL431, ATL431 08 Jan 2015
Application note Designing Overcurrent protection for TPL7407L Peripheral Driver 05 Nov 2014

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

ATL431EVM-001 — ATL431 adjustable shunt regulator evaluation module

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. (...)

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Limit: 3
Evaluation board

UCC28780EVM-002 — UCC28780 active clamp flyback 45W AC/DC EVM with GaN FET

The UCC28780EVM-002 demonstrates high-efficiency and high-density for a 45-W off-line adapter using the UCC28780 active-clamp flyback controller at high frequency nominal 300 kHz using GaN MOSFET Power ICs, NV6115 and NV6117.  The EVM also uses the UCC24612 synchronous rectifier controller on (...)

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Limit: 2
Evaluation board

UCC28780EVM-021 — UCC28780 active clamp flyback converter 45W EVM with UCC24612 and Si MOSFET

The UCC28780EVM-021 is a 45-W evaluation module (EVM) for evaluating an off-line active-clamp flyback adapter for notebook charging and other applications. The EVM meets CoC Tier 2 and DoE Level 6 efficiency requirements. It is intended for evaluation purposes and is not intended to be an end (...)

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Limit: 2
Simulation model

ATL431B PSpice Transient Model (Rev. C)

SLVMAS9C.ZIP (58 KB) - PSpice Model
Simulation model

ATL431A PSpice Transient Model (Rev. D)

SLVMAT0D.ZIP (51 KB) - PSpice Model
Simulation model

ATL431A Unencrypted PSpice Transient Model (Rev. B)

SLVMBJ2B.ZIP (2 KB) - PSpice Model
Simulation model

ATL431B Unencrypted PSpice Transient Model

SLVMBN7.ZIP (1 KB) - PSpice Model
Simulation model

ATL431A TINA-TI TRANSIENT SPICE MODEL

SLVMD60.ZIP (8 KB) - TINA-TI Spice Model
Simulation model

ATL431A TINA-TI TRANSIENT REFERENCE DESIGN

SLVMD61.TSC (753 KB) - TINA-TI Reference Design
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Calculation tool

SHUNT_VOLTAGE_REFERENCE_RESISTOR_CALCULATOR — Shunt voltage reference external resistor quick-start calculator

This external resistor quick-start calculator tool lets you easily calculate valid external resistor values relative to voltage reference, supply and load-current bounds. With these inputs, you can instantly view the resulting calculations and use the color-coded indications to understand (...)
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