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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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ATL431LI ACTIVE High-bandwidth, low-IQ programmable shunt regulator (pinout: KRA) The ATL431LI low-Iq adjustable shunt reference offers higher bandwidth

Technical documentation

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No results found. Please clear your search and try again. View all 13
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
More literature Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun. 28, 2019
Application notes Diode-Based Temperature Measurements (Rev. A) May 17, 2019
Technical articles How to use a voltage reference as a voltage regulator Dec. 03, 2018
More literature Tips and tricks for designing with voltage references May 30, 2017
Technical articles The great compromise: voltage references Dec. 07, 2015
Technical articles Designing for isolated DC/DC converter shunt safety Aug. 29, 2015
Technical articles Can overcurrent protection be simple and precise, while minimizing cost? Jul. 31, 2015
User guides ATL431EVM User's Guide Apr. 28, 2015
Application notes Designing with the Advanced TL431, ATL431 Jan. 08, 2015
Application notes Designing Overcurrent protection for TPL7407L Peripheral Driver Nov. 05, 2014

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
EVALUATION BOARDS Download
document-generic User guide
$199.00
Description

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 (...)

Features
  • 45-W, 20-V AC-to-DC converter using active-clamp flyback controller, GaN MOSFET Power IC, and synchronous rectification
  • High Efficiency (> 94%), High Power Density (> 20W/in3), Low Standby Power (55mW), and High Switching Frequency (300kHz)
  • Exceeds EU Code of Conduct and US Department of Energy (...)
EVALUATION BOARDS Download
document-generic User guide
$149.00
Description

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 (...)

Features
  • 45-W, 20-V AC-to-DC converter using active-clamp flyback controller, Si MOSFET Power IC, and synchronous rectification.
  • High Efficiency (> 93%), High Power Density (> 20W/in3), Low Standby Power (55mW), and High Switching Frequency (300kHz).
  • Exceeds EU Code of Conduct and US Department of Energy (...)

Design tools & simulation

SIMULATION MODELS Download
SLVMAS9C.ZIP (58 KB) - PSpice Model
SIMULATION MODELS Download
SLVMAT0D.ZIP (51 KB) - PSpice Model
SIMULATION MODELS Download
SLVMBJ2B.ZIP (2 KB) - PSpice Model
SIMULATION MODELS Download
SLVMBN7.ZIP (1 KB) - PSpice Model
SIMULATION MODELS Download
SLVMD60.ZIP (8 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SLVMD61.TSC (753 KB) - TINA-TI Reference Design
CALCULATION TOOLS Download
Shunt voltage reference external resistor quick-start calculator
SHUNT_VOLTAGE_REFERENCE_RESISTOR_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 (...)
Features
  • Case-specific tool to calculate external resistor value associated with shunt voltage reference
  • Input fields for: voltage reference, supply voltage, load current and Iq bound values
  • Real-time effects of input values on schematic
  • Quick indicators notifying user of valid and invalid outputs
  • Error messages (...)

Reference designs

REFERENCE DESIGNS Download
65W Active clamp flyback with Si FETs reference design for a high power density 5-20V AC/DC adapter
PMP21479 — This reference design uses the UCC28780 active clamp flyback controller to generate a 20-V/15-V/9-V/5-V adjustable output voltage. The maximum power rating is 65 W at 20-V output and up to 3 A at all other output voltage settings. This design reaches a peak efficiency of over 93% using silicon FETs (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
>95% Efficiency, 1-kW analog control AC/DC reference design for 5G telecom rectifier
TIDA-010081 — This compact, high efficiency reference design with a 54-V DC, 1000-W output targets 5G telecom power and industrial AC/DC power supplies. The circuit consists of a front-end continuous conduction mode (CCM) power factor correction (PFC) circuit based on the UCC28180, followed by a robust LLC stage (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
65-W USB Type-C ZVS-flyback reference design
PMP21552 — This reference design is a low-cost, high-density USB adapter that uses the UCC28780 active-clamp flyback controller and UCC5304 isolated driver in a ZVS-flyback topology. The maximum power rating is 65 W at 20-V output but is adjustable for 20-V/15-V/9-V/5-V output voltage and 3 A.  This (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
22-W/in3, 93.1% peak efficiency, 100-W USB-PD 3.0 AC/DC adapter reference design with Si MOSFET
TIDA-010047 — This fully-tested reference design is a high-efficiency, high-power-density, AC/DC adapter solution with a wide input voltage range (100- to 240-V AC) for laptop adapters and smartphone charger applications. This design consists of a front-end transition-mode (TM) power factor correction (PFC (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Back-up battery power reference design for automotive emergency calling applications
TIDA-050031 — This back-up power reference design is for automotive E-Call application. It uses one cell LiFePO4 as the backup battery. The minimum backup battery voltage can be down to 2 V with boost converter TPS61088-Q1; the maximum output power can be 8 V/1.7A. This reference design is low-cost, high (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High efficiency, 70-W AC/DC active clamp flyback reference design
PMP30631 — This reference design uses the UCC28780 active clamp flyback controller to generate an isolated output of 20 V @ 3.5 A over an input voltage rage of 90 Vac to 264 Vac. The design also uses the UCC24612 synchronous rectifier controller on the secondary side. Zero voltage switching (ZVS) ensures high (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
30-W/in3, 94% Efficiency, 65-W USB Type-C PD AC/DC adapter reference design
TIDA-01622 — This fully tested, USB power delivery reference design is a high efficiency, high power density, AC/DC adapter solution with a wide input voltage range (85 - 265VAC) for laptop adapters and smartphone charger applications. It adopts active-clamp-flyback topology controlled by TI’s newest ACF (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
75V/10A Protected Full-Bridge Power Stage Reference Design for Bipolar Stepper Drives
TIDA-00210 — Stepper drives are used in many applications operating typically from 12VDC to 48VDC. TI offers a rich family of stepper motor driver solutions with industry standard step/direction and parallel control interfaces.

For applications which require higher torque and power, often voltages above 48VDC (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Self-Powered AC Solid State Relay with MOSFETs Reference Design
TIDA-00377 — The self-powered AC solid state relay with MOSFETs reference design is a single relay replacement that enables efficient power management for a low-power alternative to standard electromechanical relays in thermostat applications. This SSR reference design is self-powered through the 24V AC power (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
36W, Universal Input, >90% Efficiency, Dual Output Aux Supply Ref Design for PSU
TIDA-00709 — The TIDA-00709 is a 36-W, dual output, auxiliary power supply with provision to accept both wide ranges of DC as well as AC input. Based on the input, this TI Design can be used as an adapter or auxiliary power supply designed for use in power converters targeted for server, telecom, and industrial (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Energy Harvesting from Current Transformer with Super Capacitor for Fault Indicator Reference Design
TIDA-01385 — Power management for the energy harvesting, energy buffering and back-up power is a key challenge in the fault indicator design. The TIDA-01385 introduces a circuit about harvesting energy from a current transformer for the system load of a fault indicator while storing the extra energy in a super (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Energy Harvesting and Fault Indicator Subsystem for Overhead Fault Indicators Reference Design
TIDA-00998 — The TIDA-00998 TI Design shows multiple architectures for extending primary battery life using a secondary battery or supercapacitor with energy harvested from a current transformer (CT) or solar cells. Optimal Power management is done using efficient LED Drivers to drive series or parallel strings (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
75V/10A Protected Full-Bridge Power Stage Reference Design for Brushed DC Drives
TIDA-00365 — Low voltage brushed DC drives are used in many applications. TI offers a rich family of brushed DC motor driver solutions with flexible control interface options for one or more brushed DC motors up to 60V.  For applications which require higher torque and power, often voltages above 60VDC are (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High Efficiency, High Power Density Active Clamp Flyback Adapter with SJ FET Reference Design
PMP40328 — PMP40328 is a maximum 9V 5A reference design for high frequency and high density adapter applications. The solution implements a high efficiency active clamp flyback  controller UCC28780 and secondary rectifier controller UCC24612-2. The efficiency is around 90% at full load. Integrated input (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
5-V/2-A, 12-V/2.5-A Dual-output flyback reference design with <50-mW standby power
TIDA-010058 — This reference design is a dual-output flyback converter using secondary-side regulation based on the UCC28742. A 5-V rail is regulated within ±1% precision and a cross regulation of a 12-V rail is within -8% to +14% at 25% to 100% load. The design utilizes a single-layer PCB for cost (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
15-W multi-output off-line flyback reference design
PMP21927 — This reference design takes a universal Vac input and creates three isolated 15-Vdc outputs. The main output can be loaded up to 1-A and achieves over 86% efficiency. The other isolated 15-V outputs can be loaded to 50-mA. These outputs have linear regulators to keep the voltages within 1 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
156-VAC - 440-VAC input magnetically resistant anti-tamper flyback reference design
PMP30435 — This offline flyback reference design uses the UCC28740 controller to generate an isolated output (12 V at 1 A) from a wide AC input (156 VAC - 440 VAC). The design was developed to be resistant to large magnetic fields (200mT) near the transformer. The transformer, the frequency and modulation (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
AC Input, 5-V/1-A and 5-V/1-A dual-output flyback reference design
PMP40487 — This design is auxiliary power supply with 5-V/1-A and 5-V/1-A dual output. The line and load regulation of the power supply is designed to be within 1% using the secondary side regulator, UCC28742. The system's reliability is improved through input UVLO and output OVP, OCP, SCP. The four point's (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
AC Input,12-V/5-A and 50-V/1-A dual-output flyback reference design
PMP40467 — This reference design is a 12-V/5-A and 50-V/1-A isolated dual-output auxiliary power supply. Secondary-side regulation improves the line and load regulation using UCC28742. DCM valley-switching operation enable higher efficiency at light load. All components height below 20 mm enable slim TV (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
58-VAC - 255-VAC 3-phase input multiple output flyback reference design
PMP30495 — This offline flyback reference design uses the LM5021 controller to generate 3 isolated outputs (12 V at 705 mA, 12 V at 733 mA, 35 V at 25 mA) from an 3 phase AC input (58 VAC - 255 VAC). The DC input voltage range is between 100 V and 623 V. The design can provide 18-W output power. The LM5021 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
180-VAC - 264-VAC input multiple output flyback reference design
PMP30462 — This offline flyback reference design uses the UCC28740 controller to generate 3 isolated outputs (5 V at 30 mA, 15 V at 20 mA, 15 V at 20 mA) from an AC input (180 VAC - 264 VAC). The design can provide 750-mW output power. The UCC28740 uses an optical coupler to regulate the 5-V output and to (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
12.4W Offline Valley Switching Flyback Reference Design with Output Referenced to Input
PMP30285 — The PMP30285 reference design uses the UCC28740 flyback controller to generate two outputs (5V @ 2A / 8V @ 0.3A) from an 120VAC to 437VAC input. The negative terminal of the 5V output is connected to the primary side (LINE). A transformer with a common mode cancellation winding is used to lower the (...)
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REFERENCE DESIGNS Download
Ultra-wide Input Range (48VAC to 240VAC) Flyback Reference Design
PMP30280 — The PMP30280 reference design generates two isolated outputs (6V @ 1.2A / 20V @ 0.15A) from an AC input (48VAC to 240VAC). The LM5021 operates at either a fixed switching frequency or in a skip cycle mode when the converter load is light. The design uses an optical coupler to regulate the output and (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
100V to 410V DC Input to 12V/4.5A Output Bias Supply Reference Design
PMP20432 — PMP20432 is an isolated bias supply reference design. With 100V or above input voltage, this design can provide maximum 2W output power. With 300V or above input voltage, this design can provide maximum 52W output power with 12V regulated output voltage. Peak 91.5% efficiency is achieved in this (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Isolated Self-Powered AC Solid State Relay with MOSFETs Reference Design
TIDA-01065 — The isolated self-powered AC solid state relay with MOSFETs reference design is a relay replacement that enables efficient power management for a low-power alternative to standard electromechanical relays. The galvanic isolation is implemented capacitively, creating a cost-efficient, reduced (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Low BOM Cost AC Solid State Relay with MOSFETs Reference Design
TIDA-01064 The low BOM cost ac solid state relay with MOSFETs reference design is a single relay replacement that enables efficient power management for a low-power alternative to standard electromechanical relays in thermostat applications. This SSR reference design is the base model of the self-powered solid (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Backup Power Reference Design for Smart Meters and Data Concentrators with GPRS
PMP9802 — The reference design describes a power management solution for data concentrators and smart meters that require both super capacitor and battery as backup power. The designed circuit implements uninterrupted power supply to drive GPRS module and other system loads by switching among the power grid (...)
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REFERENCE DESIGNS Download
Low-Cost, Flexible Voltage Supervisor and Battery Tester Reference Design
TIDA-00670 This is a low-cost, flexible voltage supervisor that uses a voltage reference in order to test the voltage of a battery. This solution can also be used as a voltage rail monitor for many applications that require accurate power delivery with multiple rails. With TI's ultra-low power voltage (...)
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REFERENCE DESIGNS Download
Ten Output QR Flyback and Buck Converter Reference Design
PMP10822 The PMP10822 reference design utilizes two QR flyback, and four buck converters. The efficiency for the 12V and 24V flyback approaches 87%, while the 16V buck converter has efficiency greater than 89%.
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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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