LM2940C   
1A Low Dropout Regulator 		Click link to Download

Features
• Dropout voltage typically 0.5V @IO = 1A
• Output current in excess of 1A
• Output voltage trimmed before assembly
• Reverse battery protection
• Internal short circuit current limit
• Mirror image insertion protection
• P + Product Enhancement tested

Description

The LM2940/LM2940C positive voltage regulator features the ability to source 1A of output current with a dropout voltage of typically 0.5V and a maximum of 1V over the entire temperature range. Furthermore, a quiescent current reduction circuit has been included which reduces the ground current when the differential between the input voltage and the output voltage exceeds approximately 3V. The quiescent current with 1A of output current and an input-output differential of 5V is therefore only 30 mA. Higher quiescent currents only exist when the regulator is in the dropout mode (VIN − VOUT ≤ 3V).

Designed also for vehicular applications, the LM2940/LM2940C and all regulated circuitry are protected from reverse battery installations or 2-battery jumps. During line transients, such as load dump when the input voltage can momentarily exceed the specified maximum operating voltage, the regulator will automatically shut down to protect both the internal circuits and the load. The LM2940/LM2940C cannot be harmed by temporary mirror-image insertion. Familiar regulator features such as short circuit and thermal overload protection are also provided.

Also Recommended
LP38690▲Lower Quiescent Current, Stable With Ceramic Output Capacitors
LP38692▲Lower Quiescent Current, Stable With Ceramic Output Capacitors & Enable Pin



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                                              LM2940C
Drag-Select for Table Reset Graph
Also Recommended
LP38690▲Lower Quiescent Current, Stable With Ceramic Output Capacitors
LP38692▲Lower Quiescent Current, Stable With Ceramic Output Capacitors & Enable Pin

Typical Application
click for larger image


Connection Diagram
click for larger image



Typical Performance
click for larger image


Paramaters / ValuesLM2940C LP38690 LP38692
Output Current1000 mA
Output Min9, 12, 15, 5 Volt
Input Max Voltage26 Volt
Dropout Voltage0.5 Volt
Adjustable OutputNo
Quiescent Current10 mA
On/Off PinNo
Error FlagNo
RegTypeLDO
Temperature Min0 deg C
Temperature Max125 deg C
Output Max9, 12, 15, 5 Volt
Output Voltage9, 12, 15, 5 Volt

Datasheets
TitleSizeDateOther
Language
LM2940/LM2940C 1A Low Dropout Regulator565
Kbytes		18-Mar-07日本語

Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM2940CS-12/NOPB
LM2940CS-12

RoHS Status



TO-263		Full production
Lead Time: 16 weeks

Samples
DistributorRegionQty
ARROWWorldwide924
AVNET-EMWorldwide1639
DIGIKEYWorldwide0
FUTUREWorldwide1100
RS COMPONENTSWorldwide270
$0.76 each at 1K+ pcsrail
of
45
LM2940CS-15/NOPB
LM2940CS-15

RoHS Status



TO-263		Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
ARROWWorldwide30
AVNET-EMWorldwide3
DIGIKEYWorldwide229
FUTUREWorldwide528
NEWARKAmericas329
$0.76 each at 1K+ pcsrail
of
45
LM2940CS-5.0/NOPB
LM2940CS-5.0

RoHS Status



TO-263		Full production
Lead Time: 16 weeks

Samples
DistributorRegionQty
ARROWWorldwide4230
DIGIKEYWorldwide215
FARNELLEurope and Asia2187
RS COMPONENTSWorldwide425
$0.76 each at 1K+ pcsrail
of
45
LM2940CS-9.0/NOPB
LM2940CS-9.0

RoHS Status



TO-263		Full production
Lead Time: 16 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide0
FARNELLEurope and Asia1867
FUTUREWorldwide90
NEWARKAmericas39
RS COMPONENTSWorldwide120
$0.76 each at 1K+ pcsrail
of
45
LM2940CSX-12/NOPB
LM2940CSX-12

RoHS Status



TO-263		Full production
Lead Time: 16 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.76 each at 1K+ pcsreel
of
500
LM2940CSX-15/NOPB
LM2940CSX-15

RoHS Status



TO-263		Full production
Lead Time: 16 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.76 each at 1K+ pcsreel
of
500
LM2940CSX-5.0/NOPB
LM2940CSX-5.0

RoHS Status



TO-263		Full production
Lead Time: 16 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
FUTUREWorldwide60
NEWARKAmericas642
$0.76 each at 1K+ pcsreel
of
500
LM2940CSX-9.0/NOPB
LM2940CSX-9.0

RoHS Status



TO-263		Full production
Lead Time: 16 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.76 each at 1K+ pcsreel
of
500
LM2940CT-12/NOPB
LM2940CT-12

RoHS Status



TO-220		Full production
Lead Time: 16 weeks

Samples
DistributorRegionQty
AECO TECHAsia Pacific225
ARROWWorldwide363
AVNET-EMWorldwide1596
DIGIKEYWorldwide2099
FARNELLEurope and Asia1549
FUTUREWorldwide1100
KEIKONGAsia Pacific20455
NEWARKAmericas1106
RS COMPONENTSWorldwide880
TAYLORAmericas3747
$0.65 each at 1K+ pcsrail
of
45
LM2940CT-15/NOPB
LM2940CT-15

RoHS Status



TO-220		Full production
Lead Time: 16 weeks

Samples
DistributorRegionQty
ARROWWorldwide658
AVNET-EMWorldwide30
DIGIKEYWorldwide797
FARNELLEurope and Asia1208
FUTUREWorldwide1100
NEWARKAmericas451
RS COMPONENTSWorldwide275
TAYLORAmericas3005
$0.65 each at 1K+ pcsrail
of
45
LM2940CT-5.0/NOPB
LM2940CT-5.0

RoHS Status



TO-220		Full production
Lead Time: 16 weeks

Samples
DistributorRegionQty
ARROWWorldwide728
AVNET-EMWorldwide1180
DIGIKEYWorldwide36
FARNELLEurope and Asia3365
FUTUREWorldwide1100
KEIKONGAsia Pacific10225
NEWARKAmericas877
RS COMPONENTSWorldwide2603
TAYLORAmericas27360
$0.65 each at 1K+ pcsrail
of
45
LM2940CT-9.0/NOPB
LM2940CT-9.0

RoHS Status



TO-220		Full production
Lead Time: 16 weeks

 
DistributorRegionQty
ARROWWorldwide2396
DIGIKEYWorldwide0
FUTUREWorldwide813
NEWARKAmericas305
RS COMPONENTSWorldwide285
TAYLORAmericas3015
$0.65 each at 1K+ pcsrail
of
45
LM2940C-12 MWC

RoHS Status

Full production
Lead Time: 12 weeks

 

Contact your distributor
CALLwafer jar
of
N/A

Obsolete Versions
Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM2940C-5 MWC
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
LM2940CS-12/NOPB
LM2940CS-12
TO-26333
3		245
235		DetailDownloadN/A
NSUZXYTTE#
LM2940CS
-12 P+
LM2940CS-15/NOPB
LM2940CS-15
TO-26333
3		245
235		DetailDownloadN/A
NSUZXYTTE#
LM2940CS
-15 P+
LM2940CS-5.0/NOPB
LM2940CS-5.0
TO-26333
3		245
235		DetailDownloadN/A
NSUZXYTTE#
LM2940CS
-5.0 P+
LM2940CS-9.0/NOPB
LM2940CS-9.0
TO-26333
3		245
235		DetailDownloadN/A
NSUZXYTTE#
LM2940CS
-9.0 P+
LM2940CSX-12/NOPB
LM2940CSX-12
TO-26333
3		245
235		DetailDownloadN/A
NSUZXYTTE#
LM2940CS
-12 P+
LM2940CSX-15/NOPB
LM2940CSX-15
TO-26333
3		245
235		DetailDownloadN/A
NSUZXYTTE#
LM2940CS
-15 P+
LM2940CSX-5.0/NOPB
LM2940CSX-5.0
TO-26333
3		245
235		DetailDownloadN/A
NSUZXYTTE#
LM2940CS
-5.0 P+
LM2940CSX-9.0/NOPB
LM2940CSX-9.0
TO-26333
3		245
235		DetailDownloadN/A
NSUZXYTTE#
LM2940CS
-9.0 P+
LM2940CT-12/NOPB
LM2940CT-12
TO-22031
1		NA
NA		DetailDownloadN/A
NSUZXYTTE#
LM2940CT
-12 P+
LM2940CT-15/NOPB
LM2940CT-15
TO-22031
1		NA
NA		DetailDownloadN/A
NSUZXYTTE#
LM2940CT
-15 P+
LM2940CT-5.0/NOPB
LM2940CT-5.0
TO-22031
1		NA
NA		DetailDownloadN/A
NSUZXYTTE#
LM2940CT
-5.0 P+
LM2940CT-9.0/NOPB
LM2940CT-9.0
TO-22031
1		NA
NA		DetailDownloadN/A
NSUZXYTTE#
LM2940CT
-9.0 P+
LM2940C-12 MWC
WaferN/A
-

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.

CAD Symbols and Models
Download LM2940C CAD Symbols
 Models
N/A

Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM2940C-12 MWCSLM04404600353250011002356520
LM2940CS-12SLM04404600353250011002356520
LM2940CS-15SLM04404600353250011002356520
LM2940CS-5.0SLM04404600353250011002356520
LM2940CS-9.0SLM04404600353250011002356520
LM2940CSX-12SLM04404600353250011002356520
LM2940CSX-15SLM04404600353250011002356520
LM2940CSX-5.0SLM04404600353250011002356520
LM2940CSX-9.0SLM04404600353250011002356520
LM2940CT-12SLM04404600353250011002356520
LM2940CT-15SLM04404600353250011002356520
LM2940CT-5.0SLM04404600353250011002356520
LM2940CT-9.0SLM04404600353250011002356520

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.


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
LM2940C-5 MWC
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009

[Information as of 9-Feb-2010]