LM2931 - Series Low Dropout Regulators

LM2931 - Series Low Dropout Regulators

Datasheet	Packaging	Samples & Pricing	Application Notes	Knowledge Base

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

General Description

The LM2931 positive voltage regulator features a very low quiescent current of 1mA or less when supplying 10mA loads. More...

Typical Application

click for larger image

Parameters Values

Output Current 100 mA

Output Min 3, 5 Volt

Input Max Voltage 26 Volt

Dropout Voltage 0.3 Volt

Adjustable Output No

Quiescent Current 0.4 mA

On/Off Pin No, Yes

Error Flag No

RegType LDO

Temperature Min -40 deg C

Temperature Max 85 deg C

Output Max 24, 5 Volt

Output Voltage 5 Volt

Typical Performance

click for larger image

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

Additional Resources

Application Notes

Connection Diagram

click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LM2931 Series Low Dropout Regulators	412 Kbytes	6-Jun-05	Download
LM2931 Series Low Dropout Regulators (Japanese)	331 Kbytes

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Package Availability, Models, Samples & Pricing

Part Number

Package

Factory Lead Time

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking
Format

Type

Pins

Spec.

MSL
Rating

Peak
Reflow

RoHS
Report

CAD
Symbols

Qty

Qty

$US each

LM2931AM-5.0

8

NOPB
STD

1
1

260
235

N/A

Full production

N/A

Samples

Buy Now

1K+

$0.29

rail
of
95

NSZXTT
2931A
M-5.0

12 weeks

2500

LM2931CM

8

NOPB
STD

1
1

260
235

N/A

Full production

N/A

Samples

Buy Now

1K+

$0.30

rail
of
95

NSZXTT
LM29
31CM

12 weeks

5000

LM2931M-5.0

8

NOPB
STD

1
1

260
235

N/A

Full production

N/A

Samples

Buy Now

1K+

$0.29

rail
of
95

NSZXTT
2931
M-5.0

12 weeks

5000

LM2931AMX-5.0

8

NOPB
STD

1
1

260
235

N/A

Full production

N/A

Buy Now

1K+

$0.29

reel
of
2500

NSZXTT
2931A
M-5.0

8 weeks

7500

LM2931CMX

8

NOPB
STD

1
1

260
235

N/A

Full production

N/A

Buy Now

1K+

$0.30

reel
of
2500

NSZXTT
LM29
31CM

8 weeks

7500

LM2931MX-5.0

8

NOPB
STD

1
1

260
235

N/A

Full production

N/A

Buy Now

1K+

$0.29

reel
of
2500

NSZXTT
2931
M-5.0

8 weeks

7500

LM2931AT-5.0

3

NOPB
STD

1
1

NA
NA

N/A

Full production

N/A

Samples

Buy Now

1K+

$0.51

rail
of
45

NSUZXYTTE#
LM2931
AT5.0

8 weeks

5000

LM2931T-5.0

3

NOPB
STD

1
1

NA
NA

N/A

Full production

N/A

Samples

Buy Now

1K+

$0.53

rail
of
45

NSUZXYTTE#
LM2931T
5.0

8 weeks

10000

LM2931CT

5

NOPB
STD

1
1

NA
NA

N/A

Full production

N/A

Buy Now

1K+

$0.53

rail
of
45

NSUZXYTTE#
LM2931CT

8 weeks

1000

LM2931AS-5.0

3

NOPB
STD

3
3

245
235

N/A

Full production

N/A

Samples

Buy Now

1K+

$0.97

rail
of
45

NSUZXYTTE#
LM2931
AS5.0

8 weeks

500

LM2931S-5.0

3

NOPB
STD

3
3

245
235

N/A

Full production

N/A

Samples

Buy Now

1K+

$0.91

rail
of
45

NSUZXYTTE#
LM2931S
5.0

8 weeks

2000

LM2931SX-5.0

3

NOPB

3

245

N/A

Lifetime buy

N/A

Buy Now

1K+

$0.91

reel
of
500

NSUZXYTTE#
LM2931S
5.0

8 weeks

1000

LM2931ASX-5.0

3

NOPB
STD

3
3

245
235

N/A

Full production

N/A

Buy Now

1K+

$0.97

reel
of
500

NSUZXYTTE#
LM2931
AS5.0

8 weeks

2000

LM2931CS

5

NOPB
STD

3
3

245
235

N/A

Full production

N/A

Buy Now

1K+

$0.91

rail
of
45

NSUZXYTTE#
LM2931CS

8 weeks

1000

LM2931CSX

5

NOPB
STD

3
3

245
235

N/A

Lifetime buy

N/A

Buy Now

1K+

$0.91

reel
of
500

NSUZXYTTE#
LM2931CS

8 weeks

2000

LM2931AZ-5.0

3

NOPB
STD

1
1

NA
NA

N/A

Full production

N/A

Buy Now

1K+

$0.29

box
of
1800

NSXYTT
LM293
1AZ-5

16 weeks

20000

LM2931Z-5.0

3

NOPB
STD

1
1

NA
NA

N/A

Full production

N/A

Buy Now

1K+

$0.30

box
of
1800

NSXYTT
LM293
1Z-5

8 weeks

7500

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last 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

General 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.

More Application Notes

Title	Size in Kbytes	Date
AN-1836: Application Note 1836 LMH1251 Evaluation Board Users Guide v2.0	2267 Kbytes	24-Jun-08	Download

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[Information as of 8-Nov-2009]