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

Also Recommended LM4120 Lower Supply Current, Lower Temperature Coefficient & Enable Pin LM4125 Lower Supply Current, Lower Temperature Coefficient LM4128 Lower Supply Current, Lower Temperature Coefficient & Enable Pin LM4132 Lower Supply Current, Lower Temperature Coefficient & Enable Pin

Typical Application click for larger image	Connection Diagram click for larger image
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	LMV431 Low-Voltage (1.24V) Adjustable Precision Shunt Regulators	943 Kbytes	27-May-05	日本語

Application Notes

Title		Size	Date	Other Language
	AN-1408: Application Note 1408 Designing Power Over Ethernet Using LM5070 and DP83865	1553 Kbytes	23-Nov-11	中文
	AN-2098: Application Note 2098 LM3450 Evaluation Board	3239 Kbytes	17-Nov-10
	AN-2150: Application Note 2150 LM3450A Evaluation Board	2781 Kbytes	21-Jun-11
	AN-1533: Application Note 1533 Over Voltage Protection Circuit for Automotive Load Dump	244 Kbytes	16-Mar-07	中文
	AN-2027: Application Note 2027 Inverting Application for the LMZ14203 SIMPLE SWITCHER® Power Module	1084 Kbytes	24-Mar-10	中文
	AN-2102: Application Note 2102 LM3464 and LM5021 DHC 25W Reference Designs	2723 Kbytes	31-Mar-11

Other Technical Documents

Title		Type	Date
	Precision Output Current Limiting Using Average Current Monitor Feature	Power Designer	2011-06-21
	Feedback Techniques for Crossing the Isolation Boundary	Power Designer	2007-03-22
	Powering The Signal Path: Using an integrated flyback IC along with post filtering will deliver a high-performance split-rail supply	External Article	2009-02-26

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMV431CM5/NOPB LMV431CM5 RoHS Status	SOT-23	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 9000 DIGI-KEY Worldwide 4015 FARNELL Europe and Asia 4282 MOUSER Worldwide 2990 NEWARK Americas 431 TAYLOR Americas 9450	$0.16 each at 1K+ pcs	reel of 1000
LMV431CM5X/NOPB LMV431CM5X RoHS Status	SOT-23	Full production Lead Time: 6 weeks	Distributor Region Qty AVNET-EM Worldwide 3000 DIGI-KEY Worldwide 0	$0.16 each at 1K+ pcs	reel of 3000
LMV431CZ/NOPB RoHS Status	TO-92	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 1950 DIGI-KEY Worldwide 0 FARNELL Europe and Asia 586 MOUSER Worldwide 3493 TAYLOR Americas 1950	$0.17 each at 1K+ pcs	box of 1800
LMV431IM5/NOPB LMV431IM5 RoHS Status	SOT-23	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 4000 AVNET-EM Worldwide 3000 DIGI-KEY Worldwide 2705 FARNELL Europe and Asia 8812 MOUSER Worldwide 1554 NEWARK Americas 1558 TAYLOR Americas 4000	$0.16 each at 1K+ pcs	reel of 1000
LMV431IM5X/NOPB LMV431IM5X RoHS Status	SOT-23	Full production Lead Time: 6 weeks	Distributor Region Qty AVNET-EM Worldwide 7095 DIGI-KEY Worldwide 0 MOUSER Worldwide 2985	$0.16 each at 1K+ pcs	reel of 3000
LMV431IZ/NOPB RoHS Status	TO-92	Full production Lead Time: 12 weeks	Distributor Region Qty DIGI-KEY Worldwide 0 TAYLOR Americas 9940	$0.19 each at 1K+ pcs	box of 1800

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LMV431ACZ	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LMV431BCZ	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LMV431IZ	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009

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

Moisture Sensitivity Level Data for LMV431.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMV431 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LMV431CM5/NOPB LMV431CM5	14.696 14.801	SOT-23	5	1 1	260 260	Detail	Download	N/A	N09B XTT
LMV431CM5X/NOPB LMV431CM5X	14.696 14.801	SOT-23	5	1 1	260 260	Detail	Download	N/A	N09B XTT
LMV431CZ/NOPB	201.662 202.003	TO-92	3	1	NA	Detail	Download	N/A	NSXYTT LMV431 CZ
LMV431IM5/NOPB LMV431IM5	14.696 14.801	SOT-23	5	1 1	260 260	Detail	Download	N/A	N08B XTT
LMV431IM5X/NOPB LMV431IM5X	14.696 14.801	SOT-23	5	1 1	260 260	Detail	Download	N/A	N08B XTT
LMV431IZ/NOPB	201.662 202.003	TO-92	3	1	NA	Detail	Download	N/A	NSXYTT LMV431 IZ

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

Moisture Sensitivity Level Data for LMV431.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMV431 is located at RoHS Status.

Design Tools

Title	Size	Date
LMV431 Qualification Package	792 Kbytes	24-Jun-1999

Reference Design

RD-166 - Load Detecting Power Supply

RD-168 - Ambient Light Adaptive LED Driver

CAD Symbols and Models Download LMV431 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LMV431CM5	LB300	0	34371	0	0	4164500	1	1181688246
LMV431CM5X	LB300	0	34371	0	0	4164500	1	1181688246
LMV431CZ	LB300	0	34371	0	0	4164500	1	1181688246
LMV431IM5	LB300	0	34371	0	0	4164500	1	1181688246
LMV431IM5X	LB300	0	34371	0	0	4164500	1	1181688246
LMV431IZ	LB300	0	34371	0	0	4164500	1	1181688246

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/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMV431.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMV431 is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LMV431ACZ	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LMV431BCZ	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LMV431IZ	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009