LMV431A   
Low-Voltage (1.24V) Adjustable Precision Shunt Regulators 		Click link to Download

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

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.

Applications
•Shunt Regulator
•Series Regulator
•Current Source or Sink
•Voltage Monitor
•Error Amplifier
•3V Off-Line Switching Regulator
•Low Dropout N-Channel Series Regulator



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                                              LMV431A
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Typical Application
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Connection Diagram
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Typical Performance
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ParametersValues
Initial Accuracy (+/-) Max 1 %
Reference Voltage 1.2 V
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 deg C
Temperature Max 85 deg C
PowerWise Undefined

Datasheets
TitleSizeDateOther
Language
LMV431/LMV431A/LMV431B Low-Voltage (1.24V) Adjustable Precision Shunt Regulators943
Kbytes		27-May-05日本語


Featured Application Notes
TitleSizeDateOther
Language
AN-1346: Application Note 1346 LM5070 'HE' Evaluation Board550
Kbytes		13-Mar-06 中文
AN-1724: Application Note 1724 LM5015 Isolated Two-Switch DC-DC Regulator Evaluation Board167
Kbytes		29-Oct-07 
AN-1455: Application Note 1455 LM5072 Evaluation Board708
Kbytes		30-Mar-06 中文
AN-1430: Application Note 1430 LM5071 Evaluation Board738
Kbytes		4-Jan-06 
AN-1521: Application Note 1521 POEPHYTEREV-I / -E User Guide14913
Kbytes		4-Apr-08 


More Application Notes
TitleSizeDateOther
Language
AN-1533: Application Note 1533 Over Voltage Protection Circuit for Automotive Load Dump244
Kbytes		16-Mar-07 中文
AN-1408: Application Note 1408 Designing Power Over Ethernet Using LM5070 and DP838651072
Kbytes		10-Jan-06 中文

Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LMV431ACM5/NOPB
LMV431ACM5

RoHS Status



SOT-23		Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
ARROWWorldwide8419
AVNET-EMWorldwide2000
DIGIKEYWorldwide8465
FARNELLEurope and Asia2317
FUTUREWorldwide1100
NEWARKAmericas315
TAYLORAmericas7000
$0.22 each at 1K+ pcsreel
of
1000
LMV431ACM5X/NOPB
LMV431ACM5X

RoHS Status



SOT-23		Full production
Lead Time: 12 weeks

 
DistributorRegionQty
AITGAsia Pacific140
ARROWWorldwide15000
DIGIKEYWorldwide0
FUTUREWorldwide1100
$0.22 each at 1K+ pcsreel
of
3000
LMV431AIM5/NOPB
LMV431AIM5

RoHS Status



SOT-23		Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
ARROWWorldwide2000
DIGIKEYWorldwide10995
FUTUREWorldwide1100
TAYLORAmericas11000
TECHMOSAAsia Pacific30000
$0.22 each at 1K+ pcsreel
of
1000
LMV431AIM5X/NOPB
LMV431AIM5X

RoHS Status



SOT-23		Full production
Lead Time: 16 weeks

 
DistributorRegionQty
ARROWWorldwide3000
AVNET-EMWorldwide3000
DIGIKEYWorldwide0
FUTUREWorldwide1100
RSL MICROAsia Pacific3000
TAYLORAmericas11900
$0.22 each at 1K+ pcsreel
of
3000
LMV431AIMF/NOPB
LMV431AIMF

RoHS Status



SOT-23		Full production
Lead Time: 16 weeks

Samples
DistributorRegionQty
ARROWWorldwide990
DIGIKEYWorldwide0
FUTUREWorldwide1100
$0.24 each at 1K+ pcsreel
of
1000
LMV431AIMFX/NOPB
LMV431AIMFX

RoHS Status



SOT-23		Full production
Lead Time: 16 weeks

 
DistributorRegionQty
ARROWWorldwide48000
DIGIKEYWorldwide0
FUTUREWorldwide1100
$0.24 each at 1K+ pcsreel
of
3000
LMV431AIZ/NOPB
LMV431AIZ

RoHS Status



TO-92		Full production
Lead Time: 16 weeks

Samples
DistributorRegionQty
ARROWWorldwide1201
DIGIKEYWorldwide2858
FUTUREWorldwide767
KEIKONGAsia Pacific7200
NEWARKAmericas1332
TAYLORAmericas7200
TECHMOSAAsia Pacific3600
$0.23 each at 1K+ pcsbox
of
1800

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

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Part Number(s)
(NSID)		Top ViewTypePinsMSL RatingPeak ReflowRoHS
Status		CAD SymbolsModelsPackage
Marking
Format
LMV431ACM5/NOPB
LMV431ACM5
SOT-2351
1		260
260		DetailDownloadN/A
N09A
XTT
LMV431ACM5X/NOPB
LMV431ACM5X
SOT-2351
1		260
260		DetailDownloadN/A
N09A
XTT
LMV431AIM5/NOPB
LMV431AIM5
SOT-2351
1		260
260		DetailDownloadN/A
N08A
XTT
LMV431AIM5X/NOPB
LMV431AIM5X
SOT-2351
1		260
260		DetailDownloadN/A
N08A
XTT
LMV431AIMF/NOPB
LMV431AIMF
SOT-2331
1		260
260		DetailDownloadN/A
RLA
XTT
LMV431AIMFX/NOPB
LMV431AIMFX
SOT-2331
1		260
260		DetailDownloadN/A
RLA
XTT
LMV431AIZ/NOPB
LMV431AIZ
TO-9231
1		NA
NA		DetailDownloadN/A
NSXYTT
LMV431
AIZ

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Design Tools
TitleSizeDate
LMV431A Qualification Package792 Kbytes24-Jun-1999

CAD Symbols and Models
Download LMV431A CAD Symbols
 Models
N/A

Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LMV431ACM5LB30003366400383050011086914834
LMV431ACM5XLB30003366400383050011086914834
LMV431ACZLB30003366400383050011086914834
LMV431AIM5LB30003366400383050011086914834
LMV431AIM5XLB30003366400383050011086914834
LMV431AIMFLB30003366400383050011086914834
LMV431AIMFXLB30003366400383050011086914834
LMV431AIZLB30003366400383050011086914834

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.


All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

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

[Information as of 21-Mar-2010]