LM2940 - 1A Low Dropout Regulator

LM2940

1A Low Dropout Regulator

Overview

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Diagrams

Parametrics

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Packaging

Reliability

Obsolete

Features

• Dropout voltage typically 0.5V @I_O = 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 (V_IN − V_OUT ≤ 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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LM2940

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 / Values	LM2940	LP38690	LP38692
Output Current	1000 mA	1000 mA	1000 mA
Output Min	9, 12, 15, 8, 10, 5 Volt	1.8, 5.0, 2.5, 3.3 Volt	1.8, 5.0, 2.5, 3.3 Volt
Input Min Voltage	Undefined Volt	2.75, 3.95, 3.3, 5.45 Volt	2.95, 2.7, 5.45, 3.75 Volt
Input Max Voltage	26 Volt	10 Volt	10 Volt
Dropout Voltage	0.5 Volt	0.45, 0.95, 0.8, 0.65 Volt	0.2 Volt
Adjustable Output	No	No	No
Quiescent Current	10 mA	0.055 mA	0.055 mA
On/Off Pin	No	No	Yes
Error Flag	No	No	No
RegType	LDO	LDO	LDO
Temperature Min	-40, -55 deg C	-40 deg C	-40 deg C
Temperature Max	125, 85 deg C	125 deg C	125 deg C
Output Max	9, 12, 15, 8, 10, 5 Volt	1.8, 5.0, 2.5, 3.3 Volt	1.8, 5.0, 2.5, 3.3 Volt
Output Voltage	9, 12, 15, 8, 10, 5 Volt	1.8, 5.0, 2.5, 3.3 Volt	1.8, 5.0, 2.5, 3.3 Volt

Datasheet
Title Size Date Other
Language

LM2940/LM2940C 1A Low Dropout Regulator 565
Kbytes 18-Mar-07 日本語

LM2940 Mil-Aero Datasheet MNLM2940-12-X 261 Kbytes
LM2940 Mil-Aero Datasheet MNLM2940-15-X 261 Kbytes
LM2940 Mil-Aero Datasheet MNLM2940-5.0-X 262 Kbytes

Featured Application Notes
Title Size Date Other
Language

AN-1836: Application Note 1836 LMH1251 Evaluation Board Users Guide v2.0 2267
Kbytes 24-Jun-08

More Application Notes
Title Size Date Other
Language

AN-1378: Application Note 1378 Method For Calculating Output Voltage Tolerances in Adjustable Regulators 647
Kbytes 15-Jul-05 中文

Part Number(s)
(NSID)

Top View

Availability

Current Reported Stock

Budgetary Pricing

Standard Pack Size

LM2940LD-12/NOPB

RoHS

LLP

Full production
Lead Time: 8 weeks

Distributor		Region	Qty
DIGIKEY		Worldwide	0
FUTURE		Worldwide	1100

$0.95 each at 1K+ pcs

reel
of
1000

LM2940LD-5.0/NOPB

RoHS

LLP

Full production
Lead Time: 8 weeks

Distributor		Region	Qty
AVNET-EM		Worldwide	1000
DIGIKEY		Worldwide	0

$0.95 each at 1K+ pcs

reel
of
1000

LM2940LDX-5.0/NOPB

RoHS

LLP

Lifetime buy
Lead Time: 8 weeks

Distributor		Region	Qty
DIGIKEY		Worldwide	0

$0.95 each at 1K+ pcs

reel
of
4500

LM2940IMP-8.0/NOPB
LM2940IMP-8.0

RoHS

Lifetime buy
Lead Time: 8 weeks

Distributor		Region	Qty
DIGIKEY		Worldwide	0
NEWARK		Americas	274

$0.81 each at 1K+ pcs

reel
of
1000

LM2940IMP-10/NOPB

RoHS

Full production
Lead Time: 8 weeks

Distributor	Region	Qty
AVNET-EM	Worldwide	1000
DIGIKEY	Worldwide	1855
FUTURE	Worldwide	1100
NEWARK	Americas	723

$0.81 each at 1K+ pcs

reel
of
1000

LM2940IMP-12/NOPB
LM2940IMP-12

RoHS

Full production
Lead Time: 8 weeks

Distributor		Region	Qty
DIGIKEY		Worldwide	3887
FUTURE		Worldwide	675

$0.81 each at 1K+ pcs

reel
of
1000

LM2940IMP-15/NOPB
LM2940IMP-15

RoHS

Full production
Lead Time: 8 weeks

Distributor		Region	Qty
DIGIKEY		Worldwide	2662
FUTURE		Worldwide	1100

$0.81 each at 1K+ pcs

reel
of
1000

LM2940IMP-5.0/NOPB
LM2940IMP-5.0

RoHS

Full production
Lead Time: 6 weeks

Distributor	Region	Qty
ARROW	Worldwide	585
DIGIKEY	Worldwide	25071
FARNELL	Europe and Asia	2651
FUTURE	Worldwide	1100
KEIKONG	Asia Pacific	1000
NEWARK	Americas	3951
TAYLOR	Americas	1818

$0.81 each at 1K+ pcs

reel
of
1000

LM2940IMP-9.0/NOPB

RoHS

Full production
Lead Time: 8 weeks

Distributor	Region	Qty
AVNET-EM	Worldwide	1000
DIGIKEY	Worldwide	1561
FUTURE	Worldwide	320
NEWARK	Americas	195

$0.81 each at 1K+ pcs

reel
of
1000

LM2940IMPX-15/NOPB

RoHS

Lifetime buy
Lead Time: 8 weeks

Distributor		Region	Qty
DIGIKEY		Worldwide	0

$0.81 each at 1K+ pcs

reel
of
2000

LM2940IMPX-10/NOPB

RoHS

Full production
Lead Time: 8 weeks

Distributor		Region	Qty
DIGIKEY		Worldwide	0

$0.81 each at 1K+ pcs

reel
of
2000

LM2940IMPX-12/NOPB

RoHS

Full production
Lead Time: 8 weeks

Distributor		Region	Qty
DIGIKEY		Worldwide	0

$0.81 each at 1K+ pcs

reel
of
2000

LM2940IMPX-5.0/NOPB
LM2940IMPX-5.0

RoHS

Full production
Lead Time: 12 weeks

Distributor	Region	Qty
ARROW	Worldwide	2000
DIGIKEY	Worldwide	0
FUTURE	Worldwide	1100
TECHMOSA	Asia Pacific	26000

$0.81 each at 1K+ pcs

reel
of
2000

LM2940IMPX-8.0/NOPB

RoHS

Full production
Lead Time: 8 weeks

Distributor		Region	Qty
DIGIKEY		Worldwide	0

$0.81 each at 1K+ pcs

reel
of
2000

LM2940T-10.0/NOPB
LM2940T-10.0

RoHS

Full production
Lead Time: 8 weeks

Distributor	Region	Qty
ARROW	Worldwide	2249
DIGIKEY	Worldwide	790
FARNELL	Europe and Asia	1665
FUTURE	Worldwide	1100
KEIKONG	Asia Pacific	340
NEWARK	Americas	1
RS COMPONENTS	Worldwide	535

$0.67 each at 1K+ pcs

rail
of
45

LM2940T-12.0/NOPB
LM2940T-12.0

RoHS

Full production
Lead Time: 8 weeks

Distributor	Region	Qty
ARROW	Worldwide	1619
AVNET-EM	Worldwide	601
DIGIKEY	Worldwide	1033
FARNELL	Europe and Asia	1233
FUTURE	Worldwide	1100
KEIKONG	Asia Pacific	500
NEWARK	Americas	382
RS COMPONENTS	Worldwide	290

$0.67 each at 1K+ pcs

rail
of
45

LM2940T-5.0/NOPB
LM2940T-5.0

RoHS

Full production
Lead Time: 12 weeks

Distributor	Region	Qty
ARROW	Worldwide	485
AVNET-EM	Worldwide	1504
DIGIKEY	Worldwide	1617
FARNELL	Europe and Asia	2973
FUTURE	Worldwide	1100
KEIKONG	Asia Pacific	7085
NEWARK	Americas	758
RS COMPONENTS	Worldwide	2941
TAYLOR	Americas	6795

$0.67 each at 1K+ pcs

rail
of
45

LM2940T-8.0/NOPB
LM2940T-8.0

RoHS

Full production
Lead Time: 8 weeks

Distributor	Region	Qty
ARROW	Worldwide	106
AVNET-EM	Worldwide	745
DIGIKEY	Worldwide	1214
FARNELL	Europe and Asia	1982
FUTURE	Worldwide	70
NEWARK	Americas	116
RS COMPONENTS	Worldwide	270

$0.67 each at 1K+ pcs

rail
of
45

LM2940T-9.0/NOPB
LM2940T-9.0

RoHS

Full production
Lead Time: 8 weeks

Distributor	Region	Qty
ARROW	Worldwide	414
AVNET-EM	Worldwide	17
DIGIKEY	Worldwide	455
FARNELL	Europe and Asia	1199
FUTURE	Worldwide	1100
NEWARK	Americas	410
RS COMPONENTS	Worldwide	260

$0.67 each at 1K+ pcs

rail
of
45

LM2940S-10/NOPB
LM2940S-10

RoHS

Full production
Lead Time: 8 weeks

Distributor	Region	Qty
ARROW	Worldwide	338
AVNET-EM	Worldwide	116
DIGIKEY	Worldwide	868
FUTURE	Worldwide	535
NEWARK	Americas	483

$0.81 each at 1K+ pcs

rail
of
45

LM2940S-12/NOPB
LM2940S-12

RoHS

Full production
Lead Time: 12 weeks

Distributor	Region	Qty
ARROW	Worldwide	892
DIGIKEY	Worldwide	415
FUTURE	Worldwide	1100
NEWARK	Americas	410
RS COMPONENTS	Worldwide	100
TAYLOR	Americas	660

$0.81 each at 1K+ pcs

rail
of
45

LM2940S-5.0/NOPB
LM2940S-5.0

RoHS

Full production
Lead Time: 12 weeks

Distributor	Region	Qty
ARROW	Worldwide	882
AVNET-EM	Worldwide	3419
DIGIKEY	Worldwide	1474
FARNELL	Europe and Asia	969
FUTURE	Worldwide	1100
KEIKONG	Asia Pacific	5
NEWARK	Americas	416
TAYLOR	Americas	585

$0.81 each at 1K+ pcs

rail
of
45

LM2940S-8.0/NOPB
LM2940S-8.0

RoHS

Full production
Lead Time: 8 weeks

Distributor	Region	Qty
ARROW	Worldwide	199
AVNET-EM	Worldwide	900
DIGIKEY	Worldwide	879
FUTURE	Worldwide	540
NEWARK	Americas	974

$0.85 each at 1K+ pcs

rail
of
45

LM2940S-9.0/NOPB

RoHS

Full production
Lead Time: 8 weeks

Distributor	Region	Qty
DIGIKEY	Worldwide	2058
FUTURE	Worldwide	5
NEWARK	Americas	194
TAYLOR	Americas	350

$0.85 each at 1K+ pcs

rail
of
45

LM2940SX-10/NOPB
LM2940SX-10

RoHS

Full production
Lead Time: 8 weeks

Distributor	Region	Qty
AVNET-EM	Worldwide	500
DIGIKEY	Worldwide	0
FUTURE	Worldwide	1100

$0.81 each at 1K+ pcs

reel
of
500

LM2940SX-12/NOPB
LM2940SX-12

RoHS

Full production
Lead Time: 12 weeks

Distributor		Region	Qty
DIGIKEY		Worldwide	0
FUTURE		Worldwide	1100

$0.81 each at 1K+ pcs

reel
of
500

LM2940SX-5.0/NOPB
LM2940SX-5.0

RoHS

Full production
Lead Time: 12 weeks

Distributor	Region	Qty
ARROW	Worldwide	1500
DIGIKEY	Worldwide	500
FUTURE	Worldwide	1100
NEWARK	Americas	45

$0.81 each at 1K+ pcs

reel
of
500

LM2940SX-8.0/NOPB
LM2940SX-8.0

RoHS

Full production
Lead Time: 8 weeks

Distributor	Region	Qty
ARROW	Worldwide	8000
DIGIKEY	Worldwide	0
FUTURE	Worldwide	500

$0.85 each at 1K+ pcs

reel
of
500

LM2940SX-9.0/NOPB

RoHS

Full production
Lead Time: 8 weeks

Distributor		Region	Qty
DIGIKEY		Worldwide	0
FUTURE		Worldwide	1100

$0.85 each at 1K+ pcs

reel
of
500

LM2940WG5.0/883

RoHS

Full production
Lead Time: 10 weeks

Contact your distributor

$76.90 each at 50+ pcs

tray
of
42

Obsolete Versions

Obsolete Part Alternate Part or Supplier Source Last 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

Part Number(s) (NSID)	Type	Pins	MSL Rating	Peak Reflow	RoHS	CAD Symbols	Models	Package Marking Format
LM2940LD-12/NOPB	LLP	8	3	260	RoHS	Download	N/A	NS UZXYTT L00018B
LM2940LD-5.0/NOPB	LLP	8	3	260	RoHS	Download	N/A	NS UZXYTT L00014B
LM2940LDX-5.0/NOPB	LLP	8	3	260	RoHS	Download	N/A	NS UZXYTT L00014B
LM2940IMP-8.0/NOPB LM2940IMP-8.0	SOT-223	4	1 1	260 260	RoHS	Download	N/A	XYTT L54B
LM2940IMP-10/NOPB	SOT-223	4	1	260	RoHS	Download	N/A	XYTT L55B
LM2940IMP-12/NOPB LM2940IMP-12	SOT-223	4	1 1	260 260	RoHS	Download	N/A	XYTT L56B
LM2940IMP-15/NOPB LM2940IMP-15	SOT-223	4	1 1	260 260	RoHS	Download	N/A	XYTT L70B
LM2940IMP-5.0/NOPB LM2940IMP-5.0	SOT-223	4	1 1	260 260	RoHS	Download	N/A	XYTT L53B
LM2940IMP-9.0/NOPB	SOT-223	4	1	260	RoHS	Download	N/A	XYTT L0EB
LM2940IMPX-15/NOPB	SOT-223	4	1	260	RoHS	Download	N/A	XYTT L70B
LM2940IMPX-10/NOPB	SOT-223	4	1	260	RoHS	Download	N/A	XYTT L55B
LM2940IMPX-12/NOPB	SOT-223	4	1	260	RoHS	Download	N/A	XYTT L56B
LM2940IMPX-5.0/NOPB LM2940IMPX-5.0	SOT-223	4	1 1	260 260	RoHS	Download	N/A	XYTT L53B
LM2940IMPX-8.0/NOPB	SOT-223	4	1	260	RoHS	Download	N/A	XYTT L54B
LM2940T-10.0/NOPB LM2940T-10.0	TO-220	3	1 1	NA NA	RoHS	Download	N/A	NSUZXYTTE# LM2940T 10.0 P+
LM2940T-12.0/NOPB LM2940T-12.0	TO-220	3	1 1	NA NA	RoHS	Download	N/A	NSUZXYTTE# LM2940T 12.0 P+
LM2940T-5.0/NOPB LM2940T-5.0	TO-220	3	1 1	NA NA	RoHS	Download	N/A	NSUZXYTTE# LM2940T -5.0 P+
LM2940T-8.0/NOPB LM2940T-8.0	TO-220	3	1 1	NA NA	RoHS	Download	N/A	NSUZXYTTE# LM2940T -8.0 P+
LM2940T-9.0/NOPB LM2940T-9.0	TO-220	3	1 1	NA NA	RoHS	Download	N/A	NSUZXYTTE# LM2940T -9.0 P+
LM2940S-10/NOPB LM2940S-10	TO-263	3	3 3	245 235	RoHS	Download	N/A	NSUZXYTTE# LM2940S -10 P+
LM2940S-12/NOPB LM2940S-12	TO-263	3	3 3	245 235	RoHS	Download	N/A	NSUZXYTTE# LM2940S -12 P+
LM2940S-5.0/NOPB LM2940S-5.0	TO-263	3	3 3	245 235	RoHS	Download	N/A	NSUZXYTTE# LM2940S -5.0 P+
LM2940S-8.0/NOPB LM2940S-8.0	TO-263	3	3 3	245 235	RoHS	Download	N/A	NSUZXYTTE# LM2940S -8.0 P+
LM2940S-9.0/NOPB	TO-263	3	3	245	RoHS	Download	N/A	NSUZXYTTE# LM2940S -9.0 P+
LM2940SX-10/NOPB LM2940SX-10	TO-263	3	3 3	245 235	RoHS	Download	N/A	NSUZXYTTE# LM2940S -10 P+
LM2940SX-12/NOPB LM2940SX-12	TO-263	3	3 3	245 235	RoHS	Download	N/A	NSUZXYTTE# LM2940S -12 P+
LM2940SX-5.0/NOPB LM2940SX-5.0	TO-263	3	3 3	245 235	RoHS	Download	N/A	NSUZXYTTE# LM2940S -5.0 P+
LM2940SX-8.0/NOPB LM2940SX-8.0	TO-263	3	3 3	245 235	RoHS	Download	N/A	NSUZXYTTE# LM2940S -8.0 P+
LM2940SX-9.0/NOPB	TO-263	3	3	245	RoHS	Download	N/A	NSUZXYTTE# LM2940S -9.0 P+
LM2940WG5.0/883	CERPACK	16	1	NA	RoHS	Download	N/A	NSZSSXXYYA LM2940WG5.0/ 883 Q 5962- 8958701XA

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)

LM2940IMP-10 SLM 0 44046 0 0 3532500 1 1002356520

LM2940IMP-12 SLM 0 44046 0 0 3532500 1 1002356520

LM2940IMP-15 SLM 0 44046 0 0 3532500 1 1002356520

LM2940IMP-5.0 SLM 0 44046 0 0 3532500 1 1002356520

LM2940IMP-8.0 SLM 0 44046 0 0 3532500 1 1002356520

LM2940IMP-9.0 SLM 0 44046 0 0 3532500 1 1002356520

LM2940IMPX-10 SLM 0 44046 0 0 3532500 1 1002356520

LM2940IMPX-12 SLM 0 44046 0 0 3532500 1 1002356520

LM2940IMPX-15 SLM 0 44046 0 0 3532500 1 1002356520

LM2940IMPX-5.0 SLM 0 44046 0 0 3532500 1 1002356520

LM2940IMPX-8.0 SLM 0 44046 0 0 3532500 1 1002356520

LM2940IMPX-9.0 SLM 0 44046 0 0 3532500 1 1002356520

LM2940LD-12 SLM 0 44046 0 0 3532500 1 1002356520

LM2940LD-15 SLM 0 44046 0 0 3532500 1 1002356520

LM2940LD-5.0 SLM 0 44046 0 0 3532500 1 1002356520

LM2940LD-8.0 SLM 0 44046 0 0 3532500 1 1002356520

LM2940LD-9.0 SLM 0 44046 0 0 3532500 1 1002356520

LM2940LDX-5.0 SLM 0 44046 0 0 3532500 1 1002356520

LM2940S-10 SLM 0 44046 0 0 3532500 1 1002356520

LM2940S-12 SLM 0 44046 0 0 3532500 1 1002356520

LM2940S-5.0 SLM 0 44046 0 0 3532500 1 1002356520

LM2940S-8.0 SLM 0 44046 0 0 3532500 1 1002356520

LM2940S-9.0 SLM 0 44046 0 0 3532500 1 1002356520

LM2940SX-10 SLM 0 44046 0 0 3532500 1 1002356520

LM2940SX-12 SLM 0 44046 0 0 3532500 1 1002356520

LM2940SX-5.0 SLM 0 44046 0 0 3532500 1 1002356520

LM2940SX-8.0 SLM 0 44046 0 0 3532500 1 1002356520

LM2940SX-9.0 SLM 0 44046 0 0 3532500 1 1002356520

LM2940T-10.0 SLM 0 44046 0 0 3532500 1 1002356520

LM2940T-12.0 SLM 0 44046 0 0 3532500 1 1002356520

LM2940T-5.0 SLM 0 44046 0 0 3532500 1 1002356520

LM2940T-8.0 SLM 0 44046 0 0 3532500 1 1002356520

LM2940T-9.0 SLM 0 44046 0 0 3532500 1 1002356520

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.

[Information as of 22-Nov-2009]