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


ParametersValues
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
LP38691Higher Load Capability & Lower Ground Current
LP38693Higher Load Capability & Lower Ground Current
LP3878-ADJImproved Output Current
LP5900Wide Selection Of Voltage Options, Supports Ceramic Capacitors
LM3480Higher Input Voltage, Ceramic Capacitors OK
Additional Resources
Application Notes


Connection Diagram


click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM2931 Series Low Dropout Regulators 412
Kbytes
6-Jun-05 Download
LM2931 Series Low Dropout Regulators (Japanese)
331 Kbytes   Download

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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
LM2931AM-5.0SOIC NARROW8NOPB
STD
1
1
260
235
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.29rail
of
95
NSZXTT
2931A
M-5.0
12 weeks2500
LM2931CMSOIC NARROW8NOPB
STD
1
1
260
235
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.30rail
of
95
NSZXTT
LM29
31CM
12 weeks5000
LM2931M-5.0SOIC NARROW8NOPB
STD
1
1
260
235
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.29rail
of
95
NSZXTT
2931
M-5.0
12 weeks5000
LM2931AMX-5.0SOIC NARROW8NOPB
STD
1
1
260
235
RoHS N/A Full productionN/A
 
Buy Now
1K+$0.29reel
of
2500
NSZXTT
2931A
M-5.0
8 weeks7500
LM2931CMXSOIC NARROW8NOPB
STD
1
1
260
235
RoHS N/A Full productionN/A
 
Buy Now
1K+$0.30reel
of
2500
NSZXTT
LM29
31CM
8 weeks7500
LM2931MX-5.0SOIC NARROW8NOPB
STD
1
1
260
235
RoHS N/A Full productionN/A
 
Buy Now
1K+$0.29reel
of
2500
NSZXTT
2931
M-5.0
8 weeks7500
LM2931AT-5.0TO-2203NOPB
STD
1
1
NA
NA
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.51rail
of
45
NSUZXYTTE#
LM2931
AT5.0
8 weeks5000
LM2931T-5.0TO-2203NOPB
STD
1
1
NA
NA
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.53rail
of
45
NSUZXYTTE#
LM2931T
5.0
8 weeks10000
LM2931CTTO-2205NOPB
STD
1
1
NA
NA
RoHS N/A Full productionN/A
 
Buy Now
1K+$0.53rail
of
45
NSUZXYTTE#
LM2931CT
8 weeks1000
LM2931AS-5.0TO-2633NOPB
STD
3
3
245
235
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.97rail
of
45
NSUZXYTTE#
LM2931
AS5.0
8 weeks500
LM2931S-5.0TO-2633NOPB
STD
3
3
245
235
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.91rail
of
45
NSUZXYTTE#
LM2931S
5.0
8 weeks2000
LM2931SX-5.0TO-2633NOPB3245RoHS N/A Lifetime buyN/A
 
Buy Now
1K+$0.91reel
of
500
NSUZXYTTE#
LM2931S
5.0
8 weeks1000
LM2931ASX-5.0TO-2633NOPB
STD
3
3
245
235
RoHS N/A Full productionN/A
 
Buy Now
1K+$0.97reel
of
500
NSUZXYTTE#
LM2931
AS5.0
8 weeks2000
LM2931CSTO-2635NOPB
STD
3
3
245
235
RoHS N/A Full productionN/A
 
Buy Now
1K+$0.91rail
of
45
NSUZXYTTE#
LM2931CS
8 weeks1000
LM2931CSXTO-2635NOPB
STD
3
3
245
235
RoHS N/A Lifetime buyN/A
 
Buy Now
1K+$0.91reel
of
500
NSUZXYTTE#
LM2931CS
8 weeks2000
LM2931AZ-5.0TO-923NOPB
STD
1
1
NA
NA
RoHS N/A Full productionN/A
 
Buy Now
1K+$0.29box
of
1800
NSXYTT
LM293
1AZ-5
16 weeks20000
LM2931Z-5.0TO-923NOPB
STD
1
1
NA
NA
RoHS N/A Full productionN/A
 
Buy Now
1K+$0.30box
of
1800
NSXYTT
LM293
1Z-5
8 weeks7500

Obsolete Versions

Obsolete PartAlternate Part or SupplierSourceLast 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


TitleSize in Kbytes Date Click link below to Download
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]