LM2931   
Series Low Dropout Regulators 		Click link to Download

Features
• Very low quiescent current
• Output current in excess of 100 mA
• Input-output differential less than 0.6V
• Reverse battery protection
• 60V load dump protection
• −50V reverse transient protection
• Short circuit protection
• Internal thermal overload protection
• Mirror-image insertion protection
• Available in TO-220, TO-92, TO-263, SO-8 or 6-Bump micro SMD packages
• Available as adjustable with TTL compatible switch
• See AN-1112 for micro SMD considerations

Description

The LM2931 positive voltage regulator features a very low quiescent current of 1mA or less when supplying 10mA loads. This unique characteristic and the extremely low input-output differential required for proper regulation (0.2V for output currents of 10mA) make the LM2931 the ideal regulator for standby power systems. Applications include memory standby circuits, CMOS and other low power processor power supplies as well as systems demanding as much as 100mA of output current.

Designed originally for automotive applications, the LM2931 and all regulated circuitry are protected from reverse battery installations or 2 battery jumps. During line transients, such as a load dump (60V) when the input voltage to the regulator can momentarily exceed the specified maximum operating voltage, the regulator will automatically shut down to protect both internal circuits and the load. The LM2931 cannot be harmed by temporary mirror-image insertion. Familiar regulator features such as short circuit and thermal overload protection are also provided.

The LM2931 family includes a fixed 5V output (±3.8% tolerance for A grade) or an adjustable output with ON/OFF pin. Both versions are available in a TO-220 power package, TO-263 surface mount package, and an 8-lead surface mount package. The fixed output version is also available in the TO-92 plastic and 6-Bump micro SMD packages.

Also Recommended
LP38691▲Higher Load Capability & Lower Ground Current
LP38693▲Higher Load Capability & Lower Ground Current
LP3878-ADJ▲Improved Output Current
LP5900▲Wide Selection Of Voltage Options, Supports Ceramic Capacitors
LM3480▲Higher Input Voltage, Ceramic Capacitors OK



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Also Recommended
LP38691▲Higher Load Capability & Lower Ground Current
LP38693▲Higher Load Capability & Lower Ground Current
LP3878-ADJ▲Improved Output Current
LP5900▲Wide Selection Of Voltage Options, Supports Ceramic Capacitors
LM3480▲Higher Input Voltage, Ceramic Capacitors OK

Typical Application
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Connection Diagram
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Typical Performance
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Paramaters / ValuesLM2931 LP38691 LP38693 LP3878-ADJ LP5900 LM3480
Output Current100 mA 500 mA 500 mA 800 mA 150 mA 100 mA
Output Min3, 5 Volt 1.8, 2.5, 3.3, 5 Volt 1.8, 2.5, 3.3, 5 Volt 1 Volt 3.3, 2.8, 1.5 Volt 3.3, 12, 15, 5 Volt
Input Max Voltage26 Volt 10 Volt 10 Volt 16 Volt 5.5 Volt 30 Volt
Dropout Voltage0.3 Volt Undefined, 0.25, 0.33, 0.43 Volt Undefined, 0.25, 0.33, 0.43 Volt 0.475 Volt 0.08 Volt
Adjustable OutputNo No No Yes No No
Quiescent Current0.4 mA 0.055 mA 0.055 mA 0.18 mA 0.025 mA
On/Off PinNo, Yes No Yes Yes Yes No
Error FlagNo No No No No No
RegTypeLDO LDO LDO LDO LDO QuasiLDO
Temperature Min-40 deg C -40 deg C -40 deg C -40 deg C -40 deg C -40 deg C
Temperature Max85 deg C 125 deg C 125 deg C 125 deg C 125 deg C 125 deg C
Output Max24, 5 Volt 1.8, 2.5, 3.3, 5 Volt 1.8, 2.5, 3.3, 5 Volt 5.5 Volt 3.3, 2.8, 1.5 Volt 3.3, 12, 15, 5 Volt
Output Voltage5 Volt 1.8, 2.5, 3.3, 5 Volt 1.8, 2.5, 3.3, 5 Volt Undefined Volt 3.3, 2.8, 1.5 Volt 3.3, 12, 15, 5 Volt

Datasheet
TitleSizeDateOther
Language
LM2931 Series Low Dropout Regulators412
Kbytes		6-Jun-05日本語


Featured Application Notes
TitleSizeDateOther
Language
AN-1074: Application Note-1074 CAN Products from National Semiconductor Users Guide and Application Note609
Kbytes		4-Oct-04 
AN-1073: Application Note 1073 SLIO-CAN CAN-Linked I/O Based on COP884BC862
Kbytes		4-Oct-04 


More Application Notes
TitleSizeDateOther
Language
AN-1836: Application Note 1836 LMH1251 Evaluation Board Users Guide v2.02267
Kbytes		24-Jun-08 

Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM2931AM-5.0/NOPB
LM2931AM-5.0

RoHS



SOIC NARROW		Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
ARROWWorldwide2683
AVNET-EMWorldwide10058
DIGIKEYWorldwide1338
KEIKONGAsia Pacific190
NEWARKAmericas618
RS COMPONENTSWorldwide230
TAYLORAmericas865
$0.29 each at 1K+ pcsrail
of
95
LM2931CM/NOPB
LM2931CM

RoHS



SOIC NARROW		Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
ARROWWorldwide1062
AVNET-EMWorldwide40
DIGIKEYWorldwide2192
FARNELLEurope and Asia2124
FUTUREWorldwide1100
NEWARKAmericas374
RS COMPONENTSWorldwide497
TAYLORAmericas6840
$0.30 each at 1K+ pcsrail
of
95
LM2931M-5.0/NOPB
LM2931M-5.0

RoHS



SOIC NARROW		Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
AVNET-EMWorldwide1138
DIGIKEYWorldwide19
FARNELLEurope and Asia4022
FUTUREWorldwide1100
RS COMPONENTSWorldwide655
TAYLORAmericas6175
$0.29 each at 1K+ pcsrail
of
95
LM2931AMX-5.0/NOPB
LM2931AMX-5.0

RoHS



SOIC NARROW		Full production
Lead Time: 12 weeks

 
DistributorRegionQty
ARROWWorldwide2550
AVNET-EMWorldwide2500
DIGIKEYWorldwide128
FUTUREWorldwide1100
KEIKONGAsia Pacific5000
$0.29 each at 1K+ pcsreel
of
2500
LM2931CMX/NOPB
LM2931CMX

RoHS



SOIC NARROW		Full production
Lead Time: 12 weeks

 
DistributorRegionQty
ARROWWorldwide3594
DIGIKEYWorldwide2500
FUTUREWorldwide1100
$0.30 each at 1K+ pcsreel
of
2500
LM2931MX-5.0/NOPB
LM2931MX-5.0

RoHS



SOIC NARROW		Full production
Lead Time: 8 weeks

 
DistributorRegionQty
AVNET-EMWorldwide5000
DIGIKEYWorldwide2500
FUTUREWorldwide1100
KEIKONGAsia Pacific32500
$0.29 each at 1K+ pcsreel
of
2500
LM2931AT-5.0/NOPB
LM2931AT-5.0

RoHS

Full production
Lead Time: 8 weeks

Samples
DistributorRegionQty
ARROWWorldwide115
AVNET-EMWorldwide288
DIGIKEYWorldwide1394
FUTUREWorldwide1100
TAYLORAmericas82
$0.51 each at 1K+ pcsrail
of
45
LM2931T-5.0/NOPB
LM2931T-5.0

RoHS

Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
ARROWWorldwide87
AVNET-EMWorldwide425
DIGIKEYWorldwide930
FARNELLEurope and Asia385
FUTUREWorldwide416
KEIKONGAsia Pacific8000
NEWARKAmericas658
RSL MICROAsia Pacific10350
TAYLORAmericas4375
$0.53 each at 1K+ pcsrail
of
45
LM2931CT/NOPB
LM2931CT

RoHS



TO-220		Full production
Lead Time: 8 weeks

 
DistributorRegionQty
ARROWWorldwide574
AVNET-EMWorldwide627
DIGIKEYWorldwide71
FARNELLEurope and Asia722
FUTUREWorldwide1100
KEIKONGAsia Pacific5800
RS COMPONENTSWorldwide342
TAYLORAmericas4040
$0.53 each at 1K+ pcsrail
of
45
LM2931AS-5.0/NOPB
LM2931AS-5.0

RoHS

Full production
Lead Time: 8 weeks

Samples
DistributorRegionQty
ARROWWorldwide828
AVNET-EMWorldwide405
DIGIKEYWorldwide156
FUTUREWorldwide143
NEWARKAmericas95
$0.97 each at 1K+ pcsrail
of
45
LM2931S-5.0/NOPB
LM2931S-5.0

RoHS

Full production
Lead Time: 8 weeks

Samples
DistributorRegionQty
ARROWWorldwide267
AVNET-EMWorldwide305
DIGIKEYWorldwide529
FUTUREWorldwide1100
$0.91 each at 1K+ pcsrail
of
45
LM2931SX-5.0/NOPB

RoHS

Lifetime buy
Lead Time: 8 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.91 each at 1K+ pcsreel
of
500
LM2931ASX-5.0/NOPB
LM2931ASX-5.0

RoHS

Full production
Lead Time: 8 weeks

 
DistributorRegionQty
AVNET-EMWorldwide2500
DIGIKEYWorldwide0
FUTUREWorldwide1100
$0.97 each at 1K+ pcsreel
of
500
LM2931CS/NOPB
LM2931CS

RoHS



TO-263		Full production
Lead Time: 8 weeks

 
DistributorRegionQty
AVNET-EMWorldwide41
DIGIKEYWorldwide888
TAYLORAmericas3050
$0.91 each at 1K+ pcsrail
of
45
LM2931CSX/NOPB
LM2931CSX

RoHS



TO-263		Lifetime buy
Lead Time: 8 weeks

 
DistributorRegionQty
AVNET-EMWorldwide1000
DIGIKEYWorldwide0
$0.91 each at 1K+ pcsreel
of
500
LM2931AZ-5.0/NOPB
LM2931AZ-5.0

RoHS

Full production
Lead Time: 12 weeks

 
DistributorRegionQty
ARROWWorldwide1495
AVNET-EMWorldwide545
DIGIKEYWorldwide321
FARNELLEurope and Asia3378
FUTUREWorldwide307
KEIKONGAsia Pacific80288
NEWARKAmericas409
RS COMPONENTSWorldwide871
TAYLORAmericas2379
$0.29 each at 1K+ pcsbox
of
1800
LM2931Z-5.0/NOPB
LM2931Z-5.0

RoHS

Full production
Lead Time: 12 weeks

 
DistributorRegionQty
ARROWWorldwide4899
AVNET-EMWorldwide322
DIGIKEYWorldwide1036
FARNELLEurope and Asia6796
FUTUREWorldwide1100
KEIKONGAsia Pacific34978
RS COMPONENTSWorldwide810
TAYLORAmericas5800
$0.30 each at 1K+ pcsbox
of
1800

Obsolete Versions
Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM2931C MWC
LM2931
MOTOROLA
06 Dec 2005
LM2931CSX
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2931IBP-3.3
MIC2950
MICRO-REL
16 Nov 2008
LM2931IBP-5.0
LM2931AM-5.0
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM2931IBPX-3.3
LM2931CM
NATIONAL SEMICONDUCTOR
05 Mar 2008
LM2931SX-5.0
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009

Part Number(s)
(NSID)		Top ViewTypePinsMSL RatingPeak ReflowRoHSCAD SymbolsModelsPackage
Marking
Format
LM2931AM-5.0/NOPB
LM2931AM-5.0
SOIC NARROW81
1		260
235		RoHSN/AN/A
NSZXTT
2931A
M-5.0
LM2931CM/NOPB
LM2931CM
SOIC NARROW81
1		260
235		RoHSN/AN/A
NSZXTT
LM29
31CM
LM2931M-5.0/NOPB
LM2931M-5.0
SOIC NARROW81
1		260
235		RoHSN/AN/A
NSZXTT
2931
M-5.0
LM2931AMX-5.0/NOPB
LM2931AMX-5.0
SOIC NARROW81
1		260
235		RoHSN/AN/A
NSZXTT
2931A
M-5.0
LM2931CMX/NOPB
LM2931CMX
SOIC NARROW81
1		260
235		RoHSN/AN/A
NSZXTT
LM29
31CM
LM2931MX-5.0/NOPB
LM2931MX-5.0
SOIC NARROW81
1		260
235		RoHSN/AN/A
NSZXTT
2931
M-5.0
LM2931AT-5.0/NOPB
LM2931AT-5.0
TO-22031
1		NA
NA		RoHSN/AN/A
NSUZXYTTE#
LM2931
AT5.0
LM2931T-5.0/NOPB
LM2931T-5.0
TO-22031
1		NA
NA		RoHSN/AN/A
NSUZXYTTE#
LM2931T
5.0
LM2931CT/NOPB
LM2931CT
TO-22051
1		NA
NA		RoHSN/AN/A
NSUZXYTTE#
LM2931CT
LM2931AS-5.0/NOPB
LM2931AS-5.0
TO-26333
3		245
235		RoHSN/AN/A
NSUZXYTTE#
LM2931
AS5.0
LM2931S-5.0/NOPB
LM2931S-5.0
TO-26333
3		245
235		RoHSN/AN/A
NSUZXYTTE#
LM2931S
5.0
LM2931SX-5.0/NOPB
TO-26333245RoHSN/AN/A
NSUZXYTTE#
LM2931S
5.0
LM2931ASX-5.0/NOPB
LM2931ASX-5.0
TO-26333
3		245
235		RoHSN/AN/A
NSUZXYTTE#
LM2931
AS5.0
LM2931CS/NOPB
LM2931CS
TO-26353
3		245
235		RoHSN/AN/A
NSUZXYTTE#
LM2931CS
LM2931CSX/NOPB
LM2931CSX
TO-26353
3		245
235		RoHSN/AN/A
NSUZXYTTE#
LM2931CS
LM2931AZ-5.0/NOPB
LM2931AZ-5.0
TO-9231
1		NA
NA		RoHSN/AN/A
NSXYTT
LM293
1AZ-5
LM2931Z-5.0/NOPB
LM2931Z-5.0
TO-9231
1		NA
NA		RoHSN/AN/A
NSXYTT
LM293
1Z-5

Obsolete Versions
Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM2931C MWC
LM2931
MOTOROLA
06 Dec 2005
LM2931CSX
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2931IBP-3.3
MIC2950
MICRO-REL
16 Nov 2008
LM2931IBP-5.0
LM2931AM-5.0
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM2931IBPX-3.3
LM2931CM
NATIONAL SEMICONDUCTOR
05 Mar 2008
LM2931SX-5.0
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009

[Information as of 22-Nov-2009]