LM2585   
SIMPLE SWITCHER 3-Amp Flyback Regulator 		Click link to Download

Features
• Requires few external components
• Family of standard inductors and transformers
• NPN output switches 3.0A, can stand off 65V
• Wide input voltage range: 4V to 40V
• Current-mode operation for improved transient response, line regulation, and current limit
• 100 kHz switching frequency
• Internal soft-start function reduces in-rush current during start-up
• Output transistor protected by current limit, under voltage lockout, and thermal shutdown
• System Output Voltage Tolerance of ±4% max over line and load conditions

Description

The LM2585 series of regulators are monolithic integrated circuits specifically designed for flyback, step-up (boost), and forward converter applications. The device is available in 4 different output voltage versions: 3.3V, 5.0V, 12V, and adjustable.

Requiring a minimum number of external components, these regulators are cost effective, and simple to use. Included in the datasheet are typical circuits of boost and flyback regulators. Also listed are selector guides for diodes and capacitors and a family of standard inductors and flyback transformers designed to work with these switching regulators.

The power switch is a 3.0A NPN device that can stand-off 65V. Protecting the power switch are current and thermal limiting circuits, and an undervoltage lockout circuit. This IC contains a 100 kHz fixed-frequency internal oscillator that permits the use of small magnetics. Other features include soft start mode to reduce in-rush current during start up, current mode control for improved rejection of input voltage and output load transients and cycle-by-cycle current limiting. An output voltage tolerance of ±4%, within specified input voltages and output load conditions, is guaranteed for the power supply system.

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LM2585
 
4.00 <=		 V in Lower
 V		  
<=		 V in Upper
 V		  
<= 40.00
V out 1.23 <=  V <= 300.00
I out    A <= 3.00
Ambient Temperature  °C <= 100


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LM2586▲LM2585 W/ Synchronizable, Adjustable Freq. And Soft Start
LM2587▲5A Version Of LM2585
LM2623▲Miniature 2.2A Switch (A Grade), Low Cost Versatile Converter
LM5000▲Higher Frequency (300Khz To 1.25Mhz), 2A 80V Integrated Switch In Smaller Package
LM2700Higher Frequency (600Khz, 1.25Mhz), Smaller Package, 3.6A Switch



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                                              LM2585
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Also Recommended
LM2586▲LM2585 W/ Synchronizable, Adjustable Freq. And Soft Start
LM2587▲5A Version Of LM2585
LM2623▲Miniature 2.2A Switch (A Grade), Low Cost Versatile Converter
LM5000▲Higher Frequency (300Khz To 1.25Mhz), 2A 80V Integrated Switch In Smaller Package
LM2700Higher Frequency (600Khz, 1.25Mhz), Smaller Package, 3.6A Switch

Typical Application
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Block Diagram
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Typical Performance
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Paramaters / ValuesLM2585 LM2586 LM2587 LM2623 LM5000
Output Range1.23V min, 5V, 12V, 3.3V 1.23V min, 5V, 12V, 3.3V 1.23V min, 5V, 12V, 3.3V 1.24V to 14V 1.259V min.
Switch Current3 Amp 3 Amp 5 Amp 1.2, 2.2 Amp 2 Amp
Input Min Voltage4 Volt 4 Volt 4 Volt 0.8 Volt 3.1 Volt
Input Max Voltage40 Volt 40 Volt 40 Volt 14 Volt 40 Volt
Feedback Voltage3.3, 1.23, 12, 5 Volt 3.3, 1.23, 12, 5 Volt 3.3, 1.23, 12, 5 Volt 1.259 Volt
Frequency Max100 kHz 200 kHz 100 kHz 2000 kHz 1300 kHz
Efficiency (peak)93, 80, 76 % 93, 80, 76 % 90, 75, 80 % 90 % 90 %
Sync PinNo Yes No No No
Adj Switch FrequencyNo Yes No Yes Yes
Frequency Min100 kHz 100 kHz 100 kHz 300 kHz 300 kHz
On/Off PinNo Yes No Yes Yes
Error FlagNo No No No No
SoftStartYes Yes Yes No Yes
Special FeaturesSIMPLE SWITCHER regulator SIMPLE SWITCHER regulator SIMPLE SWITCHER regulator Ratio-adaptive gated oscillator 80V internal switch, selectable frequency
TopologyBoost, Flyback Boost, Flyback Boost, Flyback Boost, Flyback Flyback, Boost, Forward, SEPIC
Step-UpYes Yes Yes Yes Yes
InvertingNo No No No No
FlybackYes Yes Yes Yes Yes
RegTypeSwitching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Regulator
Adjustable OutputYes, No Yes, No Yes, No Yes Yes
Temperature Min-40 deg C -40 deg C -40 deg C -40 deg C -40 deg C
Temperature Max125 deg C 125 deg C 125 deg C 85 deg C 125 deg C
Regulator FamilySIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER

Datasheet
TitleSizeDateOther
Language
LM2585 SIMPLE SWITCHER 3A Flyback Regulator991
Kbytes		8-Mar-07日本語


Featured Application Notes
TitleSizeDateOther
Language
AN-1082: Application Note 1082 Adjust or Synchronize LM2586/88 Switching Frequency50
Kbytes		4-Oct-04日本語
AN-1061: Application Note 1061 Power Conversion in Line-Powered Equipment162
Kbytes		1-Oct-02日本語


More Application Notes
TitleSizeDateOther
Language
AN-1095: Application Note 1095 Design of Isolated Converters Using Simple Switchers398
Kbytes		1-May-04日本語
中文
AN-116: Application Note 116 Use the LM158/LM258/LM358 Dual, Single Supply Op Amp101
Kbytes		1-Oct-02 

Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM2585T-12/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
ARROWWorldwide108
DIGIKEYWorldwide256
RS COMPONENTSWorldwide19
$3.17 each at 1K+ pcsrail
of
45
LM2585T-3.3/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide135
$3.17 each at 1K+ pcsrail
of
45
LM2585T-5.0/NOPB
LM2585T-5.0

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide161
AVNET-EMWorldwide70
DIGIKEYWorldwide125
FARNELLEurope and Asia119
FUTUREWorldwide260
NEWARKAmericas30
RS COMPONENTSWorldwide19
$3.17 each at 1K+ pcsrail
of
45
LM2585T-ADJ/NOPB
LM2585T-ADJ

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide125
AVNET-EMWorldwide18
DIGIKEYWorldwide1477
FARNELLEurope and Asia887
FUTUREWorldwide1100
NEWARKAmericas36
RS COMPONENTSWorldwide31
$3.17 each at 1K+ pcsrail
of
45
LM2585S-12/NOPB
LM2585S-12

RoHS



TO-263		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide70
AVNET-EMWorldwide30
DIGIKEYWorldwide1344
FUTUREWorldwide125
NEWARKAmericas63
RS COMPONENTSWorldwide21
$3.17 each at 1K+ pcsrail
of
45
LM2585S-3.3/NOPB

RoHS



TO-263		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide224
$3.17 each at 1K+ pcsrail
of
45
LM2585S-5.0/NOPB

RoHS



TO-263		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide324
RS COMPONENTSWorldwide1
$3.17 each at 1K+ pcsrail
of
45
LM2585S-ADJ/NOPB
LM2585S-ADJ

RoHS



TO-263		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide398
AVNET-EMWorldwide469
DIGIKEYWorldwide602
FUTUREWorldwide1100
NEWARKAmericas564
RS COMPONENTSWorldwide99
$3.17 each at 1K+ pcsrail
of
45
LM2585SX-12/NOPB
LM2585SX-12

RoHS



TO-263		Full production
Lead Time: 12 weeks

 
DistributorRegionQty
AVNET-EMWorldwide500
DIGIKEYWorldwide0
FUTUREWorldwide1100
$3.17 each at 1K+ pcsreel
of
500
LM2585SX-3.3/NOPB

RoHS



TO-263		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$3.17 each at 1K+ pcsreel
of
500
LM2585SX-5.0/NOPB
LM2585SX-5.0

RoHS



TO-263		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$3.17 each at 1K+ pcsreel
of
500
LM2585SX-ADJ/NOPB
LM2585SX-ADJ

RoHS



TO-263		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
ARROWWorldwide6000
BRITESTONESouth Korea46500
DIGIKEYWorldwide0
FUTUREWorldwide1100
NEWARKAmericas499
TECHMOSAAsia Pacific1000
$3.17 each at 1K+ pcsreel
of
500

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM2587EVAL
SIMPLE SWITCHER? 5A Flyback Regulator Eval BoardFull production


 
DistributorRegionQty
DIGIKEYWorldwide2
NATIONALWorldwide311
$34.40 each1

Features:

  • Requires few external components
  • Family of standard inductors and transformers
  • NPN output switches 5.0 A, can stand off 65 V
  • Wide input voltage range: 4 V to 40 V
  • Current-mode operation for imporved transient response, line regulation, and current limit
  • 100 kHz switching frequency
  • Internal soft-start function reduces in-rush current during start-up
  • Output transistor protected by current limit, under voltage lockout, and thermal shutdown
  • System output voltage tolerance of 4% max over line and load conditions

Applications:

  • Flyback regulator
  • Multiple-output regulator
  • Simple boost regulator
  • Forward converter

Contents:

  • A fully assembled LM2587 Flyback evaluation board
    • LM2587S-12 fixed output regulator
    • VIN      8-16V
    • VOUT 12V
    • IOUT  1A
  • LM258x datasheets
  • Product information

Part Number(s)
(NSID)		Top ViewTypePinsMSL RatingPeak ReflowRoHSCAD SymbolsModelsPackage
Marking
Format
LM2585T-12/NOPB
TO-22051NARoHSDownloadN/A
NSUZXYTTE#
LM2585T
-12 P+
LM2585T-3.3/NOPB
TO-22051NARoHSDownloadN/A
NSUZXYTTE#
LM2585T
-3.3 P+
LM2585T-5.0/NOPB
LM2585T-5.0
TO-22051
1		NA
NA		RoHSDownloadN/A
NSUZXYTTE#
LM2585T
-5.0 P+
LM2585T-ADJ/NOPB
LM2585T-ADJ
TO-22051
1		NA
NA		RoHSDownloadN/A
NSUZXYTTE#
LM2585T
-ADJ P+
LM2585S-12/NOPB
LM2585S-12
TO-26353
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM2585S
-12 P+
LM2585S-3.3/NOPB
TO-26353245RoHSDownloadN/A
NSUZXYTTE#
LM2585S
-3.3 P+
LM2585S-5.0/NOPB
TO-26353245RoHSDownloadN/A
NSUZXYTTE#
LM2585S
-5.0 P+
LM2585S-ADJ/NOPB
LM2585S-ADJ
TO-26353
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM2585S
-ADJ P+
LM2585SX-12/NOPB
LM2585SX-12
TO-26353
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM2585S
-12 P+
LM2585SX-3.3/NOPB
TO-26353245RoHSDownloadN/A
NSUZXYTTE#
LM2585S
-3.3 P+
LM2585SX-5.0/NOPB
LM2585SX-5.0
TO-26353
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM2585S
-5.0 P+
LM2585SX-ADJ/NOPB
LM2585SX-ADJ
TO-26353
3		245
235		RoHSDownloadN/A
NSUZXYTTE#
LM2585S
-ADJ P+

Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM2585S-12SLM04404600353250011002356520
LM2585S-3.3SLM04404600353250011002356520
LM2585S-5.0SLM04404600353250011002356520
LM2585S-ADJSLM04404600353250011002356520
LM2585SX-12SLM04404600353250011002356520
LM2585SX-3.3SLM04404600353250011002356520
LM2585SX-5.0SLM04404600353250011002356520
LM2585SX-ADJSLM04404600353250011002356520
LM2585T-12SLM04404600353250011002356520
LM2585T-3.3SLM04404600353250011002356520
LM2585T-5.0SLM04404600353250011002356520
LM2585T-ADJSLM04404600353250011002356520

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 21-Nov-2009]