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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) 30 Iz for regulation (Min) (uA) 80 Temp coeff (Max) (ppm/ degree C) 129, 138 Operating temperature range (C) -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 2.9 x 1.6 TO-92 (LP) 3 19 mm² 5.2 x 3.68 open-in-new Find other Shunt voltage references

Features

  • Low-Voltage Operation/Wide Adjust Range
    (1.24 V/30 V)
  • 0.5% Initial Tolerance (LMV431B)
  • Temperature Compensated for Industrial
    Temperature Range (39 PPM/°C for
    the LMV431AI)
  • Low Operation Current (55 µA)
  • Low Output Impedance (0.25 Ω)
  • Fast Turn-On Response
  • Low Cost
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Description

The LMV431, LMV431A and LMV431B are precision 1.24 V shunt regulators capable of adjustment to 30 V. Negative feedback from the cathode to the adjust pin controls the cathode voltage, much like a non-inverting op amp configuration (Refer to Symbol and Functional Diagrams). A two-resistor voltage divider terminated at the adjust pin controls the gain of a 1.24 V band-gap reference. Shorting the cathode to the adjust pin (voltage follower) provides a cathode voltage of a 1.24 V.

The LMV431, LMV431A and LMV431B have respective initial tolerances of 1.5%, 1%, and 0.5%, and functionally lend themselves to several applications that require zener diode type performance at low voltages. Applications include a 3 V to 2.7 V low drop-out regulator, an error amplifier in a 3 V off-line switching regulator and even as a voltage detector. These parts are typically stable with capacitive loads greater than 10 nF and less than 50 pF.

The LMV431, LMV431A and LMV431B provide performance at a competitive price.

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Exact equivalent in functionality and parametrics to the compared device:
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Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
LM4041-N ACTIVE Fixed & adjustable, 45-µA, precision micropower shunt voltage reference Better accuracy & temperature coefficient
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Technical documentation

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Type Title Date
* Datasheet LMV431l;LMV431Al;LMV431B Low-Voltage (1.24V) Adj Precision Shunt Regs datasheet (Rev. G) Sep. 22, 2014
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 Voltage reference selection basics white paper (Rev. A) Oct. 23, 2018
Technical articles Achieving the programmable power supply function in USB PD applications Oct. 22, 2018
Technical articles How to add overvoltage protection to a synchronous boost controller Sep. 17, 2018
Technical articles How to design a simple constant current/constant voltage buck converter Nov. 24, 2017
White papers Tips and tricks for designing with voltage references May 30, 2017
Technical articles Quantifying the value of wide VIN Jun. 15, 2016
Selection guides Voltage Reference Overview Jul. 26, 2013
User guides AN-2150 LM3450A Evaluation Board (Rev. B) May 03, 2013
Application notes AN-2102 LM3464 and LM5021 DHC 25W Reference Designs (Rev. A) May 01, 2013
User guides Ambient Light Adaptive LED Driver User Guide Jan. 27, 2012
Application notes Precision Output Current Limiting Using Average Current Monitor Feature Jun. 21, 2011
Application notes TO-92 Packing Options / Ordering Instructions (Rev. A) Jun. 23, 2010

Design & development

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

Hardware development

EVALUATION BOARDS Download
$49.00
Description

The Texas Instruments LM5023-2NBEVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM5023 AC-DC Quasi-Resonant Current Mode PWM Controller. This is a 65W evaluation modules for off-line notebook adapter applications.

Features
  • Standby power <30mW
  • Output voltage regulation <1%
  • Efficiency >88%

Design tools & simulation

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 (...)
CALCULATION TOOLS Download
SNVC184.ZIP (53 KB)
CAD/CAE SYMBOLS Download
SNVC025.ZIP (123 KB)

Reference designs

Many TI reference designs include the LMV431 Use our reference design selection tool to review and identify designs that best match your application and parameters.

CAD/CAE symbols

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

Ordering & quality

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