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Shunt voltage references

LMV431

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1.5%, low-voltage (1.24-V) adjustable precision shunt regulator

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Data sheet

LMV431

ACTIVE
Data sheet Order now

Product details

Rating Catalog VO (V) 1.24 Initial accuracy (max) (%) 1.5 Iz for regulation (min) (µA) 80 VO adj (min) (V) 1.24 VO adj (max) (V) 30 Reference voltage (V) adjustable Temp coeff (max) (ppm/°C) 129, 138 Operating temperature range (°C) -40 to 85 Iout/Iz (max) (mA) 15
Rating Catalog VO (V) 1.24 Initial accuracy (max) (%) 1.5 Iz for regulation (min) (µA) 80 VO adj (min) (V) 1.24 VO adj (max) (V) 30 Reference voltage (V) adjustable Temp coeff (max) (ppm/°C) 129, 138 Operating temperature range (°C) -40 to 85 Iout/Iz (max) (mA) 15
SOT-23 (DBV) 5 8.12 mm² 2.9 x 2.8 TO-92 (LP) 3 19.136 mm² 5.2 x 3.68
  • 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
  • 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

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.

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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Top documentation Type Title Format options Date
* Data sheet LMV431l;LMV431Al;LMV431B Low-Voltage (1.24V) Adj Precision Shunt Regs datasheet (Rev. G) 22 Sep 2014
E-book Tips and tricks for designing with voltage references (Rev. A) 07 May 2021
Selection guide 431 Device Nomenclature (Rev. B) 18 Sep 2019
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019
White paper Voltage reference selection basics white paper (Rev. A) 23 Oct 2018
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EVM User's guide AN-2150 LM3450A Evaluation Board (Rev. B) 03 May 2013
Application note AN-2102 LM3464 and LM5021 DHC 25W Reference Designs (Rev. A) 01 May 2013
User guide Ambient Light Adaptive LED Driver User Guide 27 Jan 2012
Application note Precision Output Current Limiting Using Average Current Monitor Feature 21 Jun 2011
Application note TO-92 Packing Options / Ordering Instructions (Rev. A) 23 Jun 2010

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Evaluation board

LM5023-2NBEVM — LM5023 19V 65W Notebook Adapter Evaluation Module

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.

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SHUNT-REFERENCE-CALC — Shunt Reference Selector and Design Calculator

This tool guides the user through the design process for the TLx431 and LM40x0 family of shunt voltage references. This calculator will recommend resistance and capacitance values to optimally meet the user's desired specifications.
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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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