LM1084   
5A Low Dropout Positive Regulators 		Click link to Download

Features
  • Available in 3.3V, 5.0V, 12V and Adjustable Versions
  • Current Limiting and Thermal Protection

Output Current

5A

Industrial Temperature Range

-40°C to 125°C

Line Regulation

0.015% (typical)

Load Regulation

0.1% (typical)

Description

The LM1084 is a series of low dropout voltage positive regulators with a maximum dropout of 1.5V at 5A of load current. It has the same pin-out as National Semiconductor's industry standard LM317.

The LM1084 is available in an adjustable version, which can set the output voltage with only two external resistors. It is also available in three fixed voltages: 3.3V, 5.0V and 12.0V. The fixed versions intergrate the adjust resistors.

The LM1084 circuit includes a zener trimmed bandgap reference, current limiting and thermal shutdown.

The LM1084 series is available in TO-220 and TO-263 packages. Refer to the LM1085 for the 3A version, and the LM1086 for the 1.5A version.

Applications
•Post Regulator for Switching DC/DC Conveter
•High Efficiency Linear Regulators
•Battery Charger
Also Recommended
LM2677Switching Solution With Higher Efficiency , Wider Voltage Range , Shutdown Mode
LM2678Switching Solution With Higher Efficiency , Wider Voltage Range , Shutdown Mode
LM2679Switching Solution With Higher Efficiency , Wider Voltage Range , Adjustable Current Limit
LM1085▲3A Version
LM1086▲1.5A Version



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                                              LM1084
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Also Recommended
LM2677Switching Solution With Higher Efficiency , Wider Voltage Range , Shutdown Mode
LM2678Switching Solution With Higher Efficiency , Wider Voltage Range , Shutdown Mode
LM2679Switching Solution With Higher Efficiency , Wider Voltage Range , Adjustable Current Limit
LM1085▲3A Version
LM1086▲1.5A Version

Typical Application
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Connection Diagram
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Typical Performance
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Paramaters / ValuesLM1084 LM1085 LM1086
Output Current5000 mA 3000 mA 1500 mA
Output Min1.25, 3.3, 5 Volt 3.3, 1.25, 12, 5 Volt 3.3, 1.25, 5, 2.5 Volt
Input Min Voltage2.6 Volt 2.6 Volt 2.6 Volt
Input Max Voltage25, 27, 29 Volt 25, 27, 18, 29 Volt 27, 25, 30, 29 Volt
Dropout Voltage1.3 Volt 1.3 Volt 1.3 Volt
Adjustable OutputNo No No
Quiescent Current5 mA 5 mA 2 mA
On/Off PinNo No No
Error FlagNo No No
RegTypeLDO LDO LDO
Temperature Min-40 deg C -40 deg C -40 deg C
Temperature Max125 deg C 125 deg C 125 deg C
Output Max3.3, 27.5, 5 Volt 3.3, 27.5, 12, 5 Volt 3.3, 27.5, 5, 2.5 Volt
Output Voltage3.3, 5 Volt 3.3, 12, 5 Volt 3.3, 5, 2.5 Volt

Datasheet
TitleSizeDateOther
Language
LM1084 5A Low Dropout Positive Regulators750
Kbytes		6-Jun-05日本語


Featured Application Notes
TitleSizeDateOther
Language
AN-30: Application Note 30 Log Converters124
Kbytes		2-Oct-02 
AN-29: Application Note 29 IC Op Amp Beats FETs on Input Current444
Kbytes		1-Oct-02 
AN-241: Application Note 241 Working with High Impedance Op Amps130
Kbytes		4-Oct-04 
AN-56: 1.2 Volt Reference116
Kbytes		4-Nov-95 中文
AN-41: Application Note 41 Precision IC Comparator Runs from +5V Logic Supply150
Kbytes		2-Oct-02 


More Application Notes
TitleSizeDateOther
Language
AN-79: Application Note 79 IC Preamplifier Challenges Choppers on Drift380
Kbytes		1-Oct-02 
AN-29: Application Note 29 IC Op Amp Beats FETs on Input Current444
Kbytes		1-Oct-02 
AN-241: Application Note 241 Working with High Impedance Op Amps130
Kbytes		4-Oct-04 
AN-173: Application Note 173 IC Zener Eases Reference Design54
Kbytes		1-Oct-02 
AN-161: Application Note 161 IC Voltage Reference has 1 ppm per Degree Drift138
Kbytes		10-Oct-02 
AN-222: Application Note 222 Super Matched Bipolar Transistor Pair Sets New Standards for Drift and Noise399
Kbytes		1-Oct-02 
AN-178: Application Note 178 Applications for an Adjustable IC Power Regulator40
Kbytes		3-Oct-02 
AN-1148: Application Note 1148 Linear Regulators: Theory Of Operation and Compensation200
Kbytes		10-May-04日本語
中文
AN-30: Application Note 30 Log Converters124
Kbytes		2-Oct-02 
AN-41: Application Note 41 Precision IC Comparator Runs from +5V Logic Supply150
Kbytes		2-Oct-02 
AN-56: 1.2 Volt Reference116
Kbytes		4-Nov-95 中文

Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM1084IT-3.3/NOPB
LM1084IT-3.3

RoHS

Full production
Lead Time: 8 weeks

Samples
DistributorRegionQty
ARROWWorldwide103
AVNET-EMWorldwide76
DIGIKEYWorldwide1022
FUTUREWorldwide1100
NEWARKAmericas92
RS COMPONENTSWorldwide350
TAYLORAmericas2340
$1.41 each at 1K+ pcsrail
of
45
LM1084IT-5.0/NOPB
LM1084IT-5.0

RoHS

Full production
Lead Time: 8 weeks

 
DistributorRegionQty
DIGIKEYWorldwide594
FARNELLEurope and Asia1093
FUTUREWorldwide1100
NEWARKAmericas194
RS COMPONENTSWorldwide369
TAYLORAmericas3670
$1.41 each at 1K+ pcsrail
of
45
LM1084IT-ADJ/NOPB
LM1084IT-ADJ

RoHS

Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide0
FARNELLEurope and Asia1041
NEWARKAmericas492
RS COMPONENTSWorldwide500
TAYLORAmericas1876
$1.41 each at 1K+ pcsrail
of
45
LM1084IS-12/NOPB

RoHS

Lifetime buy
Lead Time: 8 weeks

 
DistributorRegionQty
ARROWWorldwide68
DIGIKEYWorldwide0
NEWARKAmericas33
RS COMPONENTSWorldwide25
$1.40 each at 1K+ pcsrail
of
45
LM1084IS-3.3/NOPB
LM1084IS-3.3

RoHS

Full production
Lead Time: 8 weeks

Samples
DistributorRegionQty
ARROWWorldwide40
AVNET-EMWorldwide14
DIGIKEYWorldwide328
FUTUREWorldwide578
NEWARKAmericas340
RS COMPONENTSWorldwide64
$1.40 each at 1K+ pcsrail
of
45
LM1084IS-5.0/NOPB
LM1084IS-5.0

RoHS

Full production
Lead Time: 8 weeks

 
DistributorRegionQty
AVNET-EMWorldwide109
DIGIKEYWorldwide791
FUTUREWorldwide263
NEWARKAmericas116
RS COMPONENTSWorldwide50
TAYLORAmericas1468
$1.40 each at 1K+ pcsrail
of
45
LM1084IS-ADJ/NOPB
LM1084IS-ADJ

RoHS

Full production
Lead Time: 8 weeks

Samples
DistributorRegionQty
ARROWWorldwide720
AVNET-EMWorldwide857
DIGIKEYWorldwide916
FUTUREWorldwide1100
NEWARKAmericas556
RS COMPONENTSWorldwide330
$1.40 each at 1K+ pcsrail
of
45
LM1084ISX-12/NOPB

RoHS

Lifetime buy
Lead Time: 8 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.40 each at 1K+ pcsreel
of
500
LM1084ISX-3.3/NOPB
LM1084ISX-3.3

RoHS

Full production
Lead Time: 8 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
FUTUREWorldwide145
$1.40 each at 1K+ pcsreel
of
500
LM1084ISX-5.0/NOPB
LM1084ISX-5.0

RoHS

Full production
Lead Time: 8 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
FUTUREWorldwide500
$1.40 each at 1K+ pcsreel
of
500
LM1084ISX-ADJ/NOPB
LM1084ISX-ADJ

RoHS

Full production
Lead Time: 12 weeks

 
DistributorRegionQty
ARROWWorldwide665
AVNET-EMWorldwide500
DIGIKEYWorldwide0
FUTUREWorldwide850
$1.40 each at 1K+ pcsreel
of
500

Obsolete Versions
Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM1084IS-12
LM1084IS-ADJ
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM1084ISX-12
LM1084IS-ADJ
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM1084IT-12
NONE
NATIONAL SEMICONDUCTOR
16 Nov 2008

Part Number(s)
(NSID)		Top ViewTypePinsMSL RatingPeak ReflowRoHSCAD SymbolsModelsPackage
Marking
Format
LM1084IT-3.3/NOPB
LM1084IT-3.3
TO-22031
1		NA
NA		RoHSDownloadN/A
NSUZXYTTE#
LM1084
IT-3.3
LM1084IT-5.0/NOPB
LM1084IT-5.0
TO-22031
1		NA
NA		RoHSDownloadN/A
NSUZXYTTE#
LM1084
IT-5.0
LM1084IT-ADJ/NOPB
LM1084IT-ADJ
TO-22031
1		NA
NA		RoHSDownloadN/A
NSUZXYTTE#
LM1084
IT-ADJ
LM1084IS-12/NOPB
TO-26333245RoHSDownloadN/A
NSUZXYTTE#
LM1084
IS-12
LM1084IS-3.3/NOPB
LM1084IS-3.3
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM1084
IS-3.3
LM1084IS-5.0/NOPB
LM1084IS-5.0
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM1084
IS-5.0
LM1084IS-ADJ/NOPB
LM1084IS-ADJ
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM1084
IS-ADJ
LM1084ISX-12/NOPB
TO-26333245RoHSDownloadN/A
NSUZXYTTE#
LM1084
IS-12
LM1084ISX-3.3/NOPB
LM1084ISX-3.3
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM1084
IS-3.3
LM1084ISX-5.0/NOPB
LM1084ISX-5.0
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM1084
IS-5.0
LM1084ISX-ADJ/NOPB
LM1084ISX-ADJ
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM1084
IS-ADJ

Design Tools
TitleSizeDate
LM108X Qualification Package1455 Kbytes24-Jun-1999

Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM1084IS-12LB30003366400383050011086914834
LM1084IS-3.3LB30003366400383050011086914834
LM1084IS-5.0LB30003366400383050011086914834
LM1084IS-ADJLB30003366400383050011086914834
LM1084ISX-12LB30003366400383050011086914834
LM1084ISX-3.3LB30003366400383050011086914834
LM1084ISX-5.0LB30003366400383050011086914834
LM1084ISX-ADJLB30003366400383050011086914834
LM1084IT-12LB30003366400383050011086914834
LM1084IT-3.3LB30003366400383050011086914834
LM1084IT-5.0LB30003366400383050011086914834
LM1084IT-ADJLB30003366400383050011086914834

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.


Obsolete Versions
Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM1084IS-12
LM1084IS-ADJ
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM1084ISX-12
LM1084IS-ADJ
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM1084IT-12
NONE
NATIONAL SEMICONDUCTOR
16 Nov 2008

[Information as of 22-Nov-2009]