LMV431 - Low-Voltage (1.24V) Adjustable Precision Shunt Regulators
Datasheet Packaging Samples & Pricing Reliability Design Tools Reference Designs Application Notes Knowledge Base

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

General Description


The LMV431, LMV431A and LMV431B are precision 1.24V shunt regulators capable of adjustment to 30V. More...


Applications


Shunt Regulator
Series Regulator
Current Source or Sink
Voltage Monitor
Error Amplifier
3V Off-Line Switching Regulator
Low Dropout N-Channel Series Regulator
  Typical Application
click for larger image


ParametersValues
Initial Accuracy (+/-) Max 1.5 %
Reference Voltage Adjustable
Tempco, max (ppm/C) 129, 138 ppm
Operating Current 0.055 mA
Output Current Undefined mA
Reference with respect to Anode (low side)
Temperature Min -40, 0 deg C
Temperature Max 70, 85 deg C


Typical Performance


click for larger image


  Also Recommended
LM4120Lower Supply Current, Lower Temperature Coefficient & Enable Pin
LM4125Lower Supply Current, Lower Temperature Coefficient
LM4128Lower Supply Current, Lower Temperature Coefficient & Enable Pin
LM4132Lower Supply Current, Lower Temperature Coefficient & Enable Pin
Additional Resources
Online Seminars Design Tools

Application Notes


Connection Diagram


click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LMV431/LMV431A/LMV431B Low-Voltage (1.24V) Adjustable Precision Shunt Regulators 943
Kbytes
27-May-05 Download
LMV431/LMV431A/LMV431B Low-Voltage (1.24V) Adjustable Precision Shunt Regulators (Japanese)
865 Kbytes   Download

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Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders
Budgetary PricingStd
Pack
Size
Package
Marking
Format
TypePinsSpec.MSL
Rating
Peak
Reflow
RoHS
Report
CAD
Symbols
WeeksQtyQty$US each
LMV431CM5SOT-235NOPB
STD
1
1
260
260
RoHS Download Full productionN/A
Samples
Buy Now
1K+$0.17reel
of
1000
N09B
XTT
8 weeks15000
LMV431IM5SOT-235NOPB
STD
1
1
260
260
RoHS Download Full productionN/A
Samples
Buy Now
1K+$0.17reel
of
1000
N08B
XTT
8 weeks5000
LMV431CM5XSOT-235NOPB
STD
1
1
260
260
RoHS Download Full productionN/A
 
Buy Now
1K+$0.17reel
of
3000
N09B
XTT
8 weeks10000
LMV431IM5XSOT-235NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$0.17reel
of
3000
N08B
XTT
8 weeks150000
LMV431IZTO-923NOPB1NARoHS Download Lifetime buyN/A
 
Buy Now
1K+$0.19box
of
1800
NSXYTT
LMV431
IZ
8 weeksN/A
LMV431CZTO-923NOPB1NARoHS Download Full productionN/A
 
Buy Now
1K+$0.19box
of
1800
NSXYTT
LMV431
CZ
8 weeks7500

Obsolete Versions

Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LMV431ACZ
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009
LMV431BCZ
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009
LMV431IZ
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009

General Description


The LMV431, LMV431A and LMV431B are precision 1.24V shunt regulators capable of adjustment to 30V. 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 1.24V band-gap reference. Shorting the cathode to the adjust pin (voltage follower) provides a cathode voltage of a 1.24V.

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

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

Reliability Metrics


Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LMV431CM5LB30003366400383050011086914834
LMV431CM5XLB30003366400383050011086914834
LMV431CZLB30003366400383050011086914834
LMV431IM5LB30003366400383050011086914834
LMV431IM5XLB30003366400383050011086914834
LMV431IZLB30003366400383050011086914834

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


Design Tools


TitleSize in Kbytes Date Click link below to Download    
LMV431 Qualification Package 792 Kbytes 24-Jun-1999 View Online Download  

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Reference Designs
RD-166 - Load Detecting Power Supply
RD-168 - Ambient Light Adaptive LED Driver

Application Notes


TitleSize in Kbytes Date Click link below to Download
AN-1533: Application Note 1533 Over Voltage Protection Circuit for Automotive Load Dump 244
Kbytes
16-Mar-07 Download
AN-1533 (Chinese): Application Note 1533 Over Voltage Protection Circuit for Automotive Load Dump
268 Kbytes  
AN-1408: Application Note 1408 Designing Power Over Ethernet Using LM5070 and DP83865 1072
Kbytes
10-Jan-06 Download
AN-1408 (Chinese): Application Note 1408 Designing Power Over Ethernet Using LM5070 and DP83865
697 Kbytes  

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More Application Notes


TitleSize in Kbytes Date Click link below to Download
AN-1521: Application Note 1521 POEPHYTEREV-I / -E User Guide 14913
Kbytes
4-Apr-08 Download
AN-1346: Application Note 1346 LM5070 'HE' Evaluation Board 550
Kbytes
13-Mar-06 Download
AN-1346 (Chinese): Application Note 1346 LM5070 'HE' Evaluation Board
399 Kbytes  
AN-1724: Application Note 1724 LM5015 Isolated Two-Switch DC-DC Regulator Evaluation Board 167
Kbytes
29-Oct-07 Download
AN-1455: Application Note 1455 LM5072 Evaluation Board 708
Kbytes
30-Mar-06 Download
AN-1455 (Chinese): Application Note 1455 LM5072 Evaluation Board
600 Kbytes  
AN-1430: Application Note 1430 LM5071 Evaluation Board 738
Kbytes
4-Jan-06 Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 7-Nov-2009]