LM1085   
3A 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

3A

Line Regulation

0.015% (typical)

Load Regulation

0.1% (typical)

Description

The LM1085 is a series of low dropout positive voltage regulators with a maximum dropout of 1.5V at 3A of load current. It has the same pin-out as National Semiconductor's industry standard LM317.

The LM1085 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 integrate the adjust resistors.

The LM1085 circuit includes a zener trimmed bandgap reference, current limiting and thermal shutdown.

The LM1085 series is available in TO-220 and TO-263 packages. Refer to the LM1084 for the 5A version, and the LM1086 for the 1.5A version.

Applications
•High Efficiency Linear Regulators
•Battery Charger
•Post Regulation for Switching Supplies
•Constant Current Regulator
•Microprocessor Supply
Also Recommended
LP38513▲New! National's LP38k Family Of High
LP38853▲Performance LDOs Power Digital ICs
LP38859▲See More At LDO.NATIONAL.COM



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                                              LM1085
Drag-Select for Table Reset Graph
Also Recommended
LP38513▲New! National's LP38k Family Of High
LP38853▲Performance LDOs Power Digital ICs
LP38859▲See More At LDO.NATIONAL.COM

Typical Application
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Connection Diagram
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Typical Performance
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Paramaters / ValuesLM1085 LP38513 LP38853 LP38859
Output Current3000 mA 3000 mA 3000 mA 3000 mA
Output Min3.3, 1.25, 12, 5 Volt 0.8 Volt 1.2, 0.8 Volt
Input Min Voltage2.6 Volt 2.25 Volt 1.55, 1.15 Volt
Input Max Voltage25, 27, 18, 29 Volt 5.5 Volt 5.5 Volt 5.5 Volt
Dropout Voltage1.3 Volt 0.425 Volt 0.240 Volt 0.35 Volt
Adjustable OutputNo No Yes No
Quiescent Current5 mA 10 mA 10 mA 10 mA
On/Off PinNo Yes Yes No
Error FlagNo Yes No No
RegTypeLDO LDO LDO LDO
Temperature Min-40 deg C -40 deg C -40 deg C -40 deg C
Temperature Max125 deg C +125 deg C 125 deg C 125 deg C
Output Max3.3, 27.5, 12, 5 Volt 1.8 Volt 1.2, 0.8 Volt
Output Voltage3.3, 12, 5 Volt 1.8 Volt 1.2, 0.8 Volt
Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM1085IT-12/NOPB
LM1085IT-12

RoHS

Full production
Lead Time: 8 weeks

 
DistributorRegionQty
AVNET-EMWorldwide361
DIGIKEYWorldwide513
RS COMPONENTSWorldwide187
$1.03 each at 1K+ pcsrail
of
45
LM1085IT-3.3/NOPB
LM1085IT-3.3

RoHS

Full production
Lead Time: 8 weeks

Samples
DistributorRegionQty
ARROWWorldwide16
DIGIKEYWorldwide374
FUTUREWorldwide835
KEIKONGAsia Pacific1045
NEWARKAmericas230
RS COMPONENTSWorldwide210
$1.03 each at 1K+ pcsrail
of
45
LM1085IT-5.0/NOPB
LM1085IT-5.0

RoHS

Full production
Lead Time: 8 weeks

Samples
DistributorRegionQty
ARROWWorldwide20
AVNET-EMWorldwide223
DIGIKEYWorldwide922
FUTUREWorldwide1100
NEWARKAmericas109
RS COMPONENTSWorldwide498
TAYLORAmericas2300
$1.03 each at 1K+ pcsrail
of
45
LM1085IT-ADJ/NOPB
LM1085IT-ADJ

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide486
AVNET-EMWorldwide16
DIGIKEYWorldwide505
FUTUREWorldwide1100
KEIKONGAsia Pacific1000
NEWARKAmericas158
RS COMPONENTSWorldwide765
TAYLORAmericas2185
$1.03 each at 1K+ pcsrail
of
45
LM1085IS-12/NOPB
LM1085IS-12

RoHS

Full production
Lead Time: 8 weeks

 
DistributorRegionQty
ARROWWorldwide814
DIGIKEYWorldwide1357
NEWARKAmericas118
RS COMPONENTSWorldwide40
TAYLORAmericas2910
$1.09 each at 1K+ pcsrail
of
45
LM1085IS-3.3/NOPB
LM1085IS-3.3

RoHS

Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
ARROWWorldwide6345
AVNET-EMWorldwide83
DIGIKEYWorldwide47
FUTUREWorldwide1100
NEWARKAmericas383
RS COMPONENTSWorldwide103
TAYLORAmericas2625
TECHMOSAAsia Pacific180
$1.09 each at 1K+ pcsrail
of
45
LM1085IS-5.0/NOPB
LM1085IS-5.0

RoHS

Full production
Lead Time: 8 weeks

Samples
DistributorRegionQty
ARROWWorldwide69
AVNET-EMWorldwide80
DIGIKEYWorldwide792
FUTUREWorldwide1100
NEWARKAmericas415
RS COMPONENTSWorldwide529
TAYLORAmericas3631
$1.09 each at 1K+ pcsrail
of
45
LM1085IS-ADJ/NOPB
LM1085IS-ADJ

RoHS

Full production
Lead Time: 8 weeks

Samples
DistributorRegionQty
ARROWWorldwide450
AVNET-EMWorldwide640
DIGIKEYWorldwide25
FUTUREWorldwide1100
NEWARKAmericas228
RS COMPONENTSWorldwide516
TAYLORAmericas1931
$1.09 each at 1K+ pcsrail
of
45
LM1085ISX-12/NOPB
LM1085ISX-12

RoHS

Lifetime buy
Lead Time: 8 weeks

 
DistributorRegionQty
DIGIKEYWorldwide5629
TAYLORAmericas2500
$1.09 each at 1K+ pcsreel
of
500
LM1085ISX-3.3/NOPB
LM1085ISX-3.3

RoHS

Full production
Lead Time: 8 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
FUTUREWorldwide1100
TAYLORAmericas2500
$1.09 each at 1K+ pcsreel
of
500
LM1085ISX-5.0/NOPB
LM1085ISX-5.0

RoHS

Full production
Lead Time: 12 weeks

 
DistributorRegionQty
ARROWWorldwide500
DIGIKEYWorldwide0
TAYLORAmericas2500
$1.09 each at 1K+ pcsreel
of
500
LM1085ISX-ADJ/NOPB
LM1085ISX-ADJ

RoHS

Full production
Lead Time: 16 weeks

 
DistributorRegionQty
ARROWWorldwide454
DIGIKEYWorldwide0
FUTUREWorldwide1100
TAYLORAmericas2500
$1.09 each at 1K+ pcsreel
of
500
LM1085I-3.3 MDC

RoHS

Lifetime buy
Lead Time: 6 weeks

 

Contact your distributor
CALLtray
of
N/A
LM1085I-ADJ MDC

RoHS

Full production
Lead Time: 6 weeks

 

Contact your distributor
CALLtray
of
N/A

Obsolete Versions
Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM1085I-3.3 MDC
LM1085I-ADJ MDC
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM1085ISX-12
LM1085IS-ADJ
NATIONAL SEMICONDUCTOR
01 Dec 2009

Part Number(s)
(NSID)		Top ViewTypePinsMSL RatingPeak ReflowRoHSCAD SymbolsModelsPackage
Marking
Format
LM1085IT-12/NOPB
LM1085IT-12
TO-22031
1		NA
NA		RoHSDownloadN/A
NSUZXYTTE#
LM1085
IT-12
LM1085IT-3.3/NOPB
LM1085IT-3.3
TO-22031
1		NA
NA		RoHSDownloadN/A
NSUZXYTTE#
LM1085
IT-3.3
LM1085IT-5.0/NOPB
LM1085IT-5.0
TO-22031
1		NA
NA		RoHSDownloadN/A
NSUZXYTTE#
LM1085
IT-5.0
LM1085IT-ADJ/NOPB
LM1085IT-ADJ
TO-22031
1		NA
NA		RoHSDownloadN/A
NSUZXYTTE#
LM1085
IT-ADJ
LM1085IS-12/NOPB
LM1085IS-12
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM1085
IS-12
LM1085IS-3.3/NOPB
LM1085IS-3.3
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM1085
IS-3.3
LM1085IS-5.0/NOPB
LM1085IS-5.0
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM1085
IS-5.0
LM1085IS-ADJ/NOPB
LM1085IS-ADJ
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM1085
IS-ADJ
LM1085ISX-12/NOPB
LM1085ISX-12
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM1085
IS-12
LM1085ISX-3.3/NOPB
LM1085ISX-3.3
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM1085
IS-3.3
LM1085ISX-5.0/NOPB
LM1085ISX-5.0
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM1085
IS-5.0
LM1085ISX-ADJ/NOPB
LM1085ISX-ADJ
TO-26333
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM1085
IS-ADJ
LM1085I-3.3 MDC
Unpackaged DieN/A
-
LM1085I-ADJ MDC
Unpackaged DieN/A
-

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)
LM1085I-3.3 MDCLB30003366400383050011086914834
LM1085I-ADJ MDCLB30003366400383050011086914834
LM1085IS-12LB30003366400383050011086914834
LM1085IS-3.3LB30003366400383050011086914834
LM1085IS-5.0LB30003366400383050011086914834
LM1085IS-ADJLB30003366400383050011086914834
LM1085ISX-12LB30003366400383050011086914834
LM1085ISX-3.3LB30003366400383050011086914834
LM1085ISX-5.0LB30003366400383050011086914834
LM1085ISX-ADJLB30003366400383050011086914834
LM1085IT-12LB30003366400383050011086914834
LM1085IT-3.3LB30003366400383050011086914834
LM1085IT-5.0LB30003366400383050011086914834
LM1085IT-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
LM1085I-3.3 MDC
LM1085I-ADJ MDC
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM1085ISX-12
LM1085IS-ADJ
NATIONAL SEMICONDUCTOR
01 Dec 2009

[Information as of 21-Nov-2009]