LM2940 - 1A Low Dropout Regulator

Datasheet Packaging Samples & Pricing Reliability Application Notes Knowledge Base

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

General 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. More...


  Typical Application
click for larger image


Parametric Table     expand
Parametric Table    collapse
Output Current 1000 mA
Output Min 8, 9, 10, 12, 15, 5 Volt
Input Min Voltage Undefined Volt
Input Max Voltage 26 Volt
Dropout Voltage 0.5 Volt
Adjustable Output No
Quiescent Current 10 mA
Output Current 1000 mA
Output Min 8, 9, 10, 12, 15, 5 Volt
Input Min Voltage Undefined Volt
Input Max Voltage 26 Volt
Dropout Voltage 0.5 Volt
Adjustable Output No
Quiescent Current 10 mA
On/Off Pin No
Error Flag No
RegType LDO
Temperature Min -40, -55 deg C
Temperature Max 85, 125 deg C
Output Max 8, 9, 10, 12, 15, 5 Volt
Output Voltage 8, 9, 10, 12, 15, 5 Volt
AEC Q-100 Automotive Grade 0
View Using Catalog


Typical Performance

click for larger image


  Also Recommended
LP38690Lower Quiescent Current, Stable With Ceramic Output Capacitors
LP38692Lower Quiescent Current, Stable With Ceramic Output Capacitors & Enable Pin

Additional Resources

Application Notes (see below)


Connection Diagram

click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM2940/LM2940C 1A Low Dropout Regulator 565 Kbytes 18-Mar-07 Download
LM2940/LM2940C 1A Low Dropout Regulator (Japanese)
 740 Kbytes   Download
LM2940 Mil-Aero Datasheet MNLM2940-12-X 261 Kbytes   Download
LM2940 Mil-Aero Datasheet MNLM2940-15-X 261 Kbytes   Download
LM2940 Mil-Aero Datasheet MNLM2940-5.0-X 262 Kbytes   Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.


Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LM2940LD-15LLP8NOPB3260RoHS Download ObsoleteN/A
 1K+$0.73reel
of
1000		NS
UZXYTT
L00019B
16 weeks2000
LM2940LD-8.0LLP8STD
NOPB		1
3		235
260		RoHS Download ObsoleteN/A
 1K+$0.73reel
of
1000		NS
UZXYTT
L00015B
16 weeksN/A
LM2940LD-9.0LLP8STD
NOPB		1
3		235
260		RoHS Download ObsoleteN/A
 1K+$0.73reel
of
1000		NS
UZXYTT
L00016B
12 weeks2000
LM2940LD-12LLP8NOPB3260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.95reel
of
1000		NS
UZXYTT
L00018B
8 weeksN/A
LM2940LD-5.0LLP8NOPB3260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.95reel
of
1000		NS
UZXYTT
L00014B
8 weeks2000
LM2940LDX-5.0LLP8NOPB3260RoHS Download Lifetime buyN/A
 
Buy Now 		1K+$0.95reel
of
4500		NS
UZXYTT
L00014B
8 weeksN/A
LM2940IMP-8.0SOT-2234STD
NOPB		1
1		260
260		RoHS Download Lifetime buyN/A
 
Buy Now 		1K+$0.81reel
of
1000		XYTT
L54B
8 weeks2000
LM2940IMP-10SOT-2234NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.81reel
of
1000		XYTT
L55B
8 weeks5000
LM2940IMP-12SOT-2234STD
NOPB		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.81reel
of
1000		XYTT
L56B
8 weeks2000
LM2940IMP-15SOT-2234STD
NOPB		1
1		260
260		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.81reel
of
1000		XYTT
L70B
8 weeks2000
LM2940IMP-5.0SOT-2234STD
NOPB		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.81reel
of
1000		XYTT
L53B
6 weeks2000
LM2940IMP-9.0SOT-2234NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.81reel
of
1000		XYTT
L0EB
8 weeks2500
LM2940IMPX-9.0SOT-2234NOPB1260RoHS Download ObsoleteN/A
 
Buy Now 		1K+$0.81reel
of
2000		XYTT
L0EB
16 weeksN/A
LM2940IMPX-15SOT-2234NOPB1260RoHS Download Lifetime buyN/A
 
Buy Now 		1K+$0.81reel
of
2000		XYTT
L70B
8 weeks5000
LM2940IMPX-10SOT-2234NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.81reel
of
2000		XYTT
L55B
8 weeks2500
LM2940IMPX-12SOT-2234NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.81reel
of
2000		XYTT
L56B
8 weeks10000
LM2940IMPX-5.0SOT-2234STD
NOPB		1
1		260
260		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.81reel
of
2000		XYTT
L53B
8 weeks2500
LM2940IMPX-8.0SOT-2234NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.81reel
of
2000		XYTT
L54B
8 weeks3000
LM2940T-10.0TO-2203STD
NOPB		1
1		NA
NA		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.69rail
of
45		NSUZXYTTE#
LM2940T
10.0 P+
8 weeks1000
LM2940T-12.0TO-2203STD
NOPB		1
1		NA
NA		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.69rail
of
45		NSUZXYTTE#
LM2940T
12.0 P+
8 weeks1000
LM2940T-5.0TO-2203STD
NOPB		1
1		NA
NA		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.69rail
of
45		NSUZXYTTE#
LM2940T
-5.0 P+
8 weeks7500
LM2940T-8.0TO-2203STD
NOPB		1
1		NA
NA		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.69rail
of
45		NSUZXYTTE#
LM2940T
-8.0 P+
8 weeks1000
LM2940T-9.0TO-2203STD
NOPB		1
1		NA
NA		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.69rail
of
45		NSUZXYTTE#
LM2940T
-9.0 P+
8 weeks1000
LM2940S-10TO-2633STD
NOPB		3
3		235
245		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.84rail
of
45		NSUZXYTTE#
LM2940S
-10 P+
8 weeks1000
LM2940S-12TO-2633STD
NOPB		3
3		235
245		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.84rail
of
45		NSUZXYTTE#
LM2940S
-12 P+
8 weeks1000
LM2940S-5.0TO-2633STD
NOPB		3
3		235
245		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.84rail
of
45		NSUZXYTTE#
LM2940S
-5.0 P+
8 weeks2000
LM2940S-8.0TO-2633STD
NOPB		3
3		235
245		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.82rail
of
45		NSUZXYTTE#
LM2940S
-8.0 P+
8 weeks1000
LM2940S-9.0TO-2633NOPB3245RoHS Download Full productionN/A
 
Buy Now 		1K+$0.82rail
of
45		NSUZXYTTE#
LM2940S
-9.0 P+
8 weeks2000
LM2940SX-10TO-2633STD
NOPB		3
3		235
245		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.84reel
of
500		NSUZXYTTE#
LM2940S
-10 P+
8 weeks2000
LM2940SX-12TO-2633STD
NOPB		3
3		235
245		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.84reel
of
500		NSUZXYTTE#
LM2940S
-12 P+
8 weeks3000
LM2940SX-5.0TO-2633STD
NOPB		3
3		235
245		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.84reel
of
500		NSUZXYTTE#
LM2940S
-5.0 P+
8 weeks2500
LM2940SX-8.0TO-2633STD
NOPB		3
3		235
245		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.82reel
of
500		NSUZXYTTE#
LM2940S
-8.0 P+
8 weeks2000
LM2940SX-9.0TO-2633NOPB3245RoHS Download Full productionN/A
 
Buy Now 		1K+$0.82reel
of
500		NSUZXYTTE#
LM2940S
-9.0 P+
8 weeks2000
5962-9088401QEA
(LM2940J-12/883)		CERDIP16RoHS Download ObsoleteN/A
 25+$57.00rail
of
25		NSZSSXXYYA
LM2940J-12/883
5962-9088401QEA Q
8 weeksN/A
5962-9088501QEA
(LM2940J-15/883)		CERDIP16RoHS Download ObsoleteN/A
 25+$51.90rail
of
25		NSZSSXXYYA
LM2940J-15/883
5962-9088501QEA Q
8 weeks500
5962-8958701EA
(LM2940J-5.0/883)		CERDIP16RoHS Download ObsoleteN/A
 
Buy Now 		25+$57.00rail
of
25		NSZSSXXYYA
LM2940J-5.0/883
5962-8958701EA Q
8 weeks50
5962-9088401QXA
(LM2940WG-12/883)		CERPACK16RoHS Download ObsoleteN/A
 50+$65.70tray
of
42		NSZSSXXYYA
LM2940WG-12/
883 Q 5962-
9088401QXA
10 weeksN/A
5962-9088501QXA
(LM2940WG-15/883)		CERPACK16RoHS Download ObsoleteN/A
 50+$65.70tray
of
42		NSZSSXXYYA
LM2940WG-15/
883 Q 5962-
9088501QXA
10 weeksN/A
LM2940WG5.0/883CERPACK16STD1NARoHS Download Full productionN/A
 
Buy Now 		50+$76.90tray
of
42		NSZSSXXYYA
LM2940WG5.0/
883 Q 5962-
8958701XA
10 weeks100

Obsolete Versions

Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM2940C-5 MWC
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2940IMP-8.0
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2940IMPX-15
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2940IMPX-9.0
LT1086
SEMTECH
16 Nov 2008
LM2940J-12/883
NONE
NATIONAL SEMICONDUCTOR
03 Dec 2008
LM2940J-15/883
NONE
NATIONAL SEMICONDUCTOR
03 Dec 2008
LM2940J-5.0/883
NONE
NATIONAL SEMICONDUCTOR
03 Dec 2008
LM2940K-12/883
NONE
NONE
08 Sep 1999
LM2940K-15-MIL
NONE
NONE
08 Sep 1999
LM2940K-15/883
NONE
NONE
07 Dec 1999
LM2940K-5.0/883
NONE
NONE
08 Sep 1999
LM2940K-8.0/883
NONE
NONE
08 Sep 1999
LM2940LD-10
LT1086
SEMTECH
16 Nov 2008
LM2940LD-15
EC1086
ECI
16 Nov 2008
LM2940LD-8.0
EC1086
ECI
16 Nov 2008
LM2940LD-9.0
LT1086
SEMTECH
16 Nov 2008
LM2940LDX-10
EC1086
ECI
16 Nov 2008
LM2940LDX-12
LT1086
SEMTECH
16 Nov 2008
LM2940LDX-15
EC1086
ECI
16 Nov 2008
LM2940LDX-5.0
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2940LDX-8.0
LT1086
SEMTECH
16 Nov 2008
LM2940LDX-9.0
EC1086
ECI
16 Nov 2008
LM2940WG-12/883
NONE
NATIONAL SEMICONDUCTOR
03 Dec 2008
LM2940WG-15/883
NONE
NATIONAL SEMICONDUCTOR
03 Dec 2008

General 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.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM2940IMP-10SLM0427860033525002951281028
LM2940IMP-12SLM0427860033525002951281028
LM2940IMP-15SLM0427860033525002951281028
LM2940IMP-5.0SLM0427860033525002951281028
LM2940IMP-8.0SLM0427860033525002951281028
LM2940IMP-9.0SLM0427860033525002951281028
LM2940IMPX-10SLM0427860033525002951281028
LM2940IMPX-12SLM0427860033525002951281028
LM2940IMPX-15SLM0427860033525002951281028
LM2940IMPX-5.0SLM0427860033525002951281028
LM2940IMPX-8.0SLM0427860033525002951281028
LM2940IMPX-9.0SLM0427860033525002951281028
LM2940LD-12SLM0427860033525002951281028
LM2940LD-15SLM0427860033525002951281028
LM2940LD-5.0SLM0427860033525002951281028
LM2940LD-8.0SLM0427860033525002951281028
LM2940LD-9.0SLM0427860033525002951281028
LM2940LDX-5.0SLM0427860033525002951281028
LM2940S-10SLM0427860033525002951281028
LM2940S-12SLM0427860033525002951281028
LM2940S-5.0SLM0427860033525002951281028
LM2940S-8.0SLM0427860033525002951281028
LM2940S-9.0SLM0427860033525002951281028
LM2940SX-10SLM0427860033525002951281028
LM2940SX-12SLM0427860033525002951281028
LM2940SX-5.0SLM0427860033525002951281028
LM2940SX-8.0SLM0427860033525002951281028
LM2940SX-9.0SLM0427860033525002951281028
LM2940T-10.0SLM0427860033525002951281028
LM2940T-12.0SLM0427860033525002951281028
LM2940T-5.0SLM0427860033525002951281028
LM2940T-8.0SLM0427860033525002951281028
LM2940T-9.0SLM0427860033525002951281028

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.


More Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1378: Application Note 1378 Method For Calculating Output Voltage Tolerances in Adjustable Regulators 647 Kbytes 15-Jul-05 Download
AN-1378 (Chinese): Application Note 1378 Method For Calculating Output Voltage Tolerances in Adjustable Regulators
 383 Kbytes  

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 4-Jul-2009]