LM2937   
500 mA Low Dropout Regulator 		Click link to Download

Features
•Fully specified for operation over -40°C to +125°C
•Output current in excess of 500 mA
•Output trimmed for 5% tolerance under all operating conditions
•Typical dropout voltage of 0.5V at full rated load current
•Wide output capacitor ESR range, up to 3
•Internal short circuit and thermal overload protection
•Reverse battery protection
•60V input transient protection
•Mirror image insertion protection

Description

The LM2937 is a positive voltage regulator capable of supplying up to 500 mA of load current. The use of a PNP power transistor provides a low dropout voltage characteristic. With a load current of 500 mA the minimum input to output voltage differential required for the output to remain in regulation is typically 0.5V (1V guaranteed maximum over the full operating temperature range). Special circuitry has been incorporated to minimize the quiescent current to typically only 10 mA with a full 500 mA load current when the input to output voltage differential is greater than 3V.

The LM2937 requires an output bypass capacitor for stability. As with most low dropout regulators, the ESR of this capacitor remains a critical design parameter, but the LM2937 includes special compensation circuitry that relaxes ESR requirements. The LM2937 is stable for all ESR below 3. This allows the use of low ESR chip capacitors.

Ideally suited for automotive applications, the LM2937 will protect itself and any load circuitry from reverse battery connections, two-battery jumps and up to +60V/-50V load dump transients. Familiar regulator features such as short circuit and thermal shutdown protection are also built in.
Also Recommended
LP2989▲Better Performance, Lower Voltage
LP38691▲Higher Load Capability, Lower Supply Current, Stable With Lower ESR Ceramic Output Cap
LP38693▲Higher Load Capability, Lower Supply Current, Stable With Lower ESR Ceramic Output Cap
LP3878-ADJ▲Higher Load Capability, Lower Supply Current, Stable With Lower ESR Ceramic Output Cap
LM2937-2.5▲2.5V Output Voltage
LM2937-3.3▲3.3V Output Voltage



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                                              LM2937
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Also Recommended
LP2989▲Better Performance, Lower Voltage
LP38691▲Higher Load Capability, Lower Supply Current, Stable With Lower ESR Ceramic Output Cap
LP38693▲Higher Load Capability, Lower Supply Current, Stable With Lower ESR Ceramic Output Cap
LP3878-ADJ▲Higher Load Capability, Lower Supply Current, Stable With Lower ESR Ceramic Output Cap
LM2937-2.5▲2.5V Output Voltage
LM2937-3.3▲3.3V Output Voltage

Typical Application
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Connection Diagram
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Typical Performance
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Paramaters / ValuesLM2937 LP2989 LP38691 LP38693 LP3878-ADJ LM2937-2.5 LM2937-3.3
Output Current500 mA 500 mA 500 mA 500 mA 800 mA 500, 400 mA 500, 400 mA
Output Min12, 15, 8, 10, 5 Volt 2.5, 3.3, 3, 2.8, 5 Volt 1.8, 2.5, 3.3, 5 Volt 1.8, 2.5, 3.3, 5 Volt 1 Volt 2.5 Volt 3.3 Volt
Input Max Voltage26 Volt 16 Volt 10 Volt 10 Volt 16 Volt 26 Volt 26 Volt
Dropout Voltage0.5 Volt 0.31 Volt Undefined, 0.25, 0.33, 0.43 Volt Undefined, 0.25, 0.33, 0.43 Volt 0.475 Volt
Adjustable OutputNo No No No Yes No No
Quiescent Current2 mA 0.11 mA 0.055 mA 0.055 mA 0.18 mA 2 mA 2 mA
On/Off PinNo Yes No Yes Yes No No
Error FlagNo Yes No No No No No
RegTypeLDO LDO LDO LDO LDO LDO LDO
Temperature Min-40 deg C -40 deg C -40 deg C -40 deg C -40 deg C -40 deg C -40 deg C
Temperature Max125 deg C 125 deg C 125 deg C 125 deg C 125 deg C 125, 85 deg C 125, 85 deg C
Output Max12, 15, 8, 10, 5 Volt 2.5, 3.3, 3, 2.8, 5 Volt 1.8, 2.5, 3.3, 5 Volt 1.8, 2.5, 3.3, 5 Volt 5.5 Volt 2.5 Volt 3.3 Volt
Output Voltage12, 15, 8, 10, 5 Volt 2.5, 3.3, 3, 2.8, 5 Volt 1.8, 2.5, 3.3, 5 Volt 1.8, 2.5, 3.3, 5 Volt Undefined Volt 2.5 Volt 3.3 Volt

Datasheet
TitleSizeDateOther
Language
LM2937 500 mA Low Dropout Regulator746
Kbytes		29-Aug-05日本語


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


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
LM2937IMP-15/NOPB
LM2937IMP-15

RoHS

Lifetime buy
Lead Time: 8 weeks

 
DistributorRegionQty
AVNET-EMWorldwide721
DIGIKEYWorldwide0
NEWARKAmericas150
$0.69 each at 1K+ pcsreel
of
1000
LM2937IMP-10/NOPB
LM2937IMP-10

RoHS

Full production
Lead Time: 8 weeks

Samples
DistributorRegionQty
AVNET-EMWorldwide1000
DIGIKEYWorldwide4117
FUTUREWorldwide1100
NEWARKAmericas2310
RS COMPONENTSWorldwide225
$0.69 each at 1K+ pcsreel
of
1000
LM2937IMP-12/NOPB

RoHS

Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide179
FUTUREWorldwide1100
NEWARKAmericas1148
$0.69 each at 1K+ pcsreel
of
1000
LM2937IMP-5.0/NOPB
LM2937IMP-5.0

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide3000
DIGIKEYWorldwide5007
FUTUREWorldwide1100
KEIKONGAsia Pacific11000
$0.69 each at 1K+ pcsreel
of
1000
LM2937IMP-8.0/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide1000
AVNET-EMWorldwide34000
DIGIKEYWorldwide1894
FUTUREWorldwide1100
$0.69 each at 1K+ pcsreel
of
1000
LM2937IMPX-10/NOPB

RoHS

Full production
Lead Time: 8 weeks

 
DistributorRegionQty
AVNET-EMWorldwide14000
DIGIKEYWorldwide0
$0.69 each at 1K+ pcsreel
of
2000
LM2937IMPX-12/NOPB
LM2937IMPX-12

RoHS

Full production
Lead Time: 8 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.69 each at 1K+ pcsreel
of
2000
LM2937IMPX-15/NOPB

RoHS

Full production
Lead Time: 8 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.69 each at 1K+ pcsreel
of
2000
LM2937IMPX-5.0/NOPB
LM2937IMPX-5.0

RoHS

Full production
Lead Time: 8 weeks

 
DistributorRegionQty
ARROWWorldwide2000
DIGIKEYWorldwide0
FUTUREWorldwide1100
$0.69 each at 1K+ pcsreel
of
2000
LM2937IMPX-8.0/NOPB
LM2937IMPX-8.0

RoHS

Full production
Lead Time: 8 weeks

 
DistributorRegionQty
ARROWWorldwide2000
AVNET-EMWorldwide12000
DIGIKEYWorldwide0
$0.69 each at 1K+ pcsreel
of
2000
LM2937ET-10/NOPB

RoHS

Full production
Lead Time: 8 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide1050
FUTUREWorldwide1100
KEIKONGAsia Pacific810
NEWARKAmericas25
$0.74 each at 1K+ pcsrail
of
45
LM2937ET-12/NOPB
LM2937ET-12

RoHS

Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
ARROWWorldwide21
AVNET-EMWorldwide430
DIGIKEYWorldwide445
FARNELLEurope and Asia810
FUTUREWorldwide1100
NEWARKAmericas503
RS COMPONENTSWorldwide385
$0.74 each at 1K+ pcsrail
of
45
LM2937ET-15/NOPB
LM2937ET-15

RoHS

Full production
Lead Time: 8 weeks

Samples
DistributorRegionQty
ARROWWorldwide252
AVNET-EMWorldwide267
DIGIKEYWorldwide0
FARNELLEurope and Asia1322
NEWARKAmericas143
RS COMPONENTSWorldwide20
$0.74 each at 1K+ pcsrail
of
45
LM2937ET-5.0/NOPB
LM2937ET-5.0

RoHS

Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
AVNET-EMWorldwide361
DIGIKEYWorldwide893
FARNELLEurope and Asia1757
FUTUREWorldwide1100
KEIKONGAsia Pacific46830
NEWARKAmericas196
RS COMPONENTSWorldwide362
TAYLORAmericas2050
$0.74 each at 1K+ pcsrail
of
45
LM2937ET-8.0/NOPB
LM2937ET-8.0

RoHS

Full production
Lead Time: 8 weeks

Samples
DistributorRegionQty
ARROWWorldwide585
DIGIKEYWorldwide249
FUTUREWorldwide1100
NEWARKAmericas99
$0.74 each at 1K+ pcsrail
of
45
LM2937ES-10/NOPB
LM2937ES-10

RoHS

Full production
Lead Time: 8 weeks

 
DistributorRegionQty
ARROWWorldwide282
AVNET-EMWorldwide28
DIGIKEYWorldwide391
FUTUREWorldwide857
NEWARKAmericas67
TAYLORAmericas405
$0.88 each at 1K+ pcsrail
of
45
LM2937ES-12/NOPB
LM2937ES-12

RoHS

Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
ARROWWorldwide217
AVNET-EMWorldwide219
DIGIKEYWorldwide575
FUTUREWorldwide891
NEWARKAmericas421
RS COMPONENTSWorldwide130
TAYLORAmericas255
$0.88 each at 1K+ pcsrail
of
45
LM2937ES-15/NOPB
LM2937ES-15

RoHS

Full production
Lead Time: 8 weeks

Samples
DistributorRegionQty
ARROWWorldwide83
AVNET-EMWorldwide82
DIGIKEYWorldwide210
FUTUREWorldwide121
NEWARKAmericas72
RS COMPONENTSWorldwide75
$0.88 each at 1K+ pcsrail
of
45
LM2937ES-5.0/NOPB
LM2937ES-5.0

RoHS

Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
ARROWWorldwide765
DIGIKEYWorldwide0
FUTUREWorldwide1100
NEWARKAmericas520
RS COMPONENTSWorldwide105
TAYLORAmericas355
$0.88 each at 1K+ pcsrail
of
45
LM2937ES-8.0/NOPB

RoHS

Full production
Lead Time: 8 weeks

Samples
DistributorRegionQty
ARROWWorldwide1800
AVNET-EMWorldwide60
DIGIKEYWorldwide541
FUTUREWorldwide1100
NEWARKAmericas106
$0.88 each at 1K+ pcsrail
of
45
LM2937ESX-10/NOPB
LM2937ESX-10

RoHS

Lifetime buy
Lead Time: 8 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.88 each at 1K+ pcsreel
of
500
LM2937ESX-12/NOPB
LM2937ESX-12

RoHS

Full production
Lead Time: 8 weeks

 
DistributorRegionQty
ARROWWorldwide500
DIGIKEYWorldwide0
FUTUREWorldwide500
$0.88 each at 1K+ pcsreel
of
500
LM2937ESX-15/NOPB

RoHS

Full production
Lead Time: 8 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.88 each at 1K+ pcsreel
of
500
LM2937ESX-5.0/NOPB
LM2937ESX-5.0

RoHS

Full production
Lead Time: 8 weeks

 
DistributorRegionQty
ARROWWorldwide4500
DIGIKEYWorldwide4159
FUTUREWorldwide1100
TAYLORAmericas500
$0.88 each at 1K+ pcsreel
of
500
LM2937ESX-8.0/NOPB
LM2937ESX-8.0

RoHS

Full production
Lead Time: 12 weeks

 
DistributorRegionQty
ARROWWorldwide500
AVNET-EMWorldwide10000
DIGIKEYWorldwide0
FUTUREWorldwide500
$0.88 each at 1K+ pcsreel
of
500
LM2937E-5.0 MWC

RoHS

Full production
Lead Time: N/A

 

Contact your distributor
CALLwafer jar
of
N/A

Obsolete Versions
Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM2937ESX-10
MIC2937
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2937ESX-2.5
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2937IMP-15
LM2937IMPX-15
NATIONAL SEMICONDUCTOR
01 Dec 2009

Part Number(s)
(NSID)		Top ViewTypePinsMSL RatingPeak ReflowRoHSCAD SymbolsModelsPackage
Marking
Format
LM2937IMP-15/NOPB
LM2937IMP-15
SOT-22341
1		260
260		RoHSDownloadN/A
XYTT
L75B
LM2937IMP-10/NOPB
LM2937IMP-10
SOT-22341
1		260
260		RoHSDownloadN/A
XYTT
L73B
LM2937IMP-12/NOPB
SOT-22341260RoHSDownloadN/A
XYTT
L74B
LM2937IMP-5.0/NOPB
LM2937IMP-5.0
SOT-22341
1		260
260		RoHSDownloadN/A
XYTT
L71B
LM2937IMP-8.0/NOPB
SOT-22341260RoHSDownloadN/A
XYTT
L72B
LM2937IMPX-10/NOPB
SOT-22341260RoHSDownloadN/A
XYTT
L73B
LM2937IMPX-12/NOPB
LM2937IMPX-12
SOT-22341
1		260
260		RoHSDownloadN/A
XYTT
L74B
LM2937IMPX-15/NOPB
SOT-22341260RoHSDownloadN/A
XYTT
L75B
LM2937IMPX-5.0/NOPB
LM2937IMPX-5.0
SOT-22341
1		260
260		RoHSDownloadN/A
XYTT
L71B
LM2937IMPX-8.0/NOPB
LM2937IMPX-8.0
SOT-22341
1		260
260		RoHSDownloadN/A
XYTT
L72B
LM2937ET-10/NOPB
TO-22031NARoHSDownloadN/A
NSUZXYTTE#
LM2937ET
-10
LM2937ET-12/NOPB
LM2937ET-12
TO-22031
1		NA
NA		RoHSDownloadN/A
NSUZXYTTE#
LM2937ET
-12
LM2937ET-15/NOPB
LM2937ET-15
TO-22031
1		NA
NA		RoHSDownloadN/A
NSUZXYTTE#
LM2937ET
-15
LM2937ET-5.0/NOPB
LM2937ET-5.0
TO-22031
1		NA
NA		RoHSDownloadN/A
NSUZXYTTE#
LM2937ET
-5.0
LM2937ET-8.0/NOPB
LM2937ET-8.0
TO-22031
1		NA
NA		RoHSDownloadN/A
NSUZXYTTE#
LM2937ET
-8.0
LM2937ES-10/NOPB
LM2937ES-10
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM2937ES
-10
LM2937ES-12/NOPB
LM2937ES-12
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM2937ES
-12
LM2937ES-15/NOPB
LM2937ES-15
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM2937ES
-15
LM2937ES-5.0/NOPB
LM2937ES-5.0
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM2937ES
-5.0
LM2937ES-8.0/NOPB
TO-26333245RoHSDownloadN/A
NSUZXYTTE#
LM2937ES
-8.0
LM2937ESX-10/NOPB
LM2937ESX-10
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM2937ES
-10
LM2937ESX-12/NOPB
LM2937ESX-12
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM2937ES
-12
LM2937ESX-15/NOPB
TO-26333245RoHSDownloadN/A
NSUZXYTTE#
LM2937ES
-15
LM2937ESX-5.0/NOPB
LM2937ESX-5.0
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM2937ES
-5.0
LM2937ESX-8.0/NOPB
LM2937ESX-8.0
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM2937ES
-8.0
LM2937E-5.0 MWC
WaferN/A
-

Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM2937E-5.0 MWCSLM04404600353250011002356520
LM2937ES-10SLM04404600353250011002356520
LM2937ES-12SLM04404600353250011002356520
LM2937ES-15SLM04404600353250011002356520
LM2937ES-5.0SLM04404600353250011002356520
LM2937ES-8.0SLM04404600353250011002356520
LM2937ESX-10SLM04404600353250011002356520
LM2937ESX-12SLM04404600353250011002356520
LM2937ESX-15SLM04404600353250011002356520
LM2937ESX-5.0SLM04404600353250011002356520
LM2937ESX-8.0SLM04404600353250011002356520
LM2937ET-10SLM04404600353250011002356520
LM2937ET-12SLM04404600353250011002356520
LM2937ET-15SLM04404600353250011002356520
LM2937ET-5.0SLM04404600353250011002356520
LM2937ET-8.0SLM04404600353250011002356520
LM2937IMP-10SLM04404600353250011002356520
LM2937IMP-12SLM04404600353250011002356520
LM2937IMP-15SLM04404600353250011002356520
LM2937IMP-5.0SLM04404600353250011002356520
LM2937IMP-8.0SLM04404600353250011002356520
LM2937IMPX-10SLM04404600353250011002356520
LM2937IMPX-12SLM04404600353250011002356520
LM2937IMPX-15SLM04404600353250011002356520
LM2937IMPX-5.0SLM04404600353250011002356520
LM2937IMPX-8.0SLM04404600353250011002356520

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.


Obsolete Versions
Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM2937ESX-10
MIC2937
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2937ESX-2.5
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2937IMP-15
LM2937IMPX-15
NATIONAL SEMICONDUCTOR
01 Dec 2009

[Information as of 22-Nov-2009]