LM2577   
SIMPLE SWITCHER® Step-Up Voltage Regulator 		Click link to Download

Features
•Requires few external components
•NPN output switches 3.0A, can stand off 65V
•Wide input voltage range: 3.5V to 40V
•Current-mode operation for improved transient response, line regulation, and current limit
•52 kHz internal oscillator
•Soft-start function reduces in-rush current during start-up
•Output switch protected by current limit, under-voltage lockout, and thermal shutdown

Description

The LM1577/LM2577 are monolithic integrated circuits that provide all of the power and control functions for step-up (boost), flyback, and forward converter switching regulators. The device is available in three different output voltage versions: 12V, 15V, and adjustable.

Requiring a minimum number of external components, these regulators are cost effective, and simple to use. Listed in this data sheet are a family of standard inductors and flyback transformers designed to work with these switching regulators.

Included on the chip is a 3.0A NPN switch and its associated protection circuitry, consisting of current and thermal limiting, and undervoltage lockout. Other features include a 52 kHz fixed-frequency oscillator that requires no external components, a soft start mode to reduce in-rush current during start-up, and current mode control for improved rejection of input voltage and output load transients.

Applications
•Simple boost regulator
•Flyback and forward regulators
•Multiple-output regulator
WEBENCH Power Designer My Designs

LM2577
 
3.50 <=		 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


What are WEBENCH® tools?

Also Recommended
LM2585▲Higher Switching Frequency (100Khz - 200Khz)
LM2586▲Additional Features, Higher Switching Frequency (100Khz - 200Khz)
LM3224▲Higher Efficiency, Pin Selectable PWM Frequency Allowing Easy Filtering And Low Noise
LM5000▲Higher Frequency (300Khz To 1.25Mhz), 1.3A 80V Integrated Switch In Smaller Package
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                                              LM2577
Drag-Select for Table Reset Graph
Also Recommended
LM2585▲Higher Switching Frequency (100Khz - 200Khz)
LM2586▲Additional Features, Higher Switching Frequency (100Khz - 200Khz)
LM3224▲Higher Efficiency, Pin Selectable PWM Frequency Allowing Easy Filtering And Low Noise
LM5000▲Higher Frequency (300Khz To 1.25Mhz), 1.3A 80V Integrated Switch In Smaller Package
Paramaters / ValuesLM2577 LM2585 LM2586 LM3224 LM5000
Output Range15V, 1.23V min, 12V 1.23V min, 5V, 12V, 3.3V 1.23V min, 5V, 12V, 3.3V Vin to 20V 1.259V min.
Switch Current3 Amp 3 Amp 3 Amp 2.6 Amp 2 Amp
Input Min Voltage3.5 Volt 4 Volt 4 Volt 2.7 Volt 3.1 Volt
Input Max Voltage40 Volt 40 Volt 40 Volt 7 Volt 40 Volt
Feedback Voltage1.23, 12, 15 Volt 3.3, 1.23, 12, 5 Volt 3.3, 1.23, 12, 5 Volt 1.259 Volt
Frequency Max52 kHz 100 kHz 200 kHz 1250 kHz 1300 kHz
Efficiency (peak)80 % 93, 80, 76 % 93, 80, 76 % 90 % 90 %
Sync PinNo No Yes No No
Adj Switch FrequencyNo No Yes Yes Yes
Frequency Min52 kHz 100 kHz 100 kHz 615 kHz 300 kHz
On/Off PinNo No Yes Yes Yes
Error FlagNo No No No No
SoftStartYes Yes Yes Yes Yes
Special FeaturesSIMPLE SWITCHER regulator SIMPLE SWITCHER regulator SIMPLE SWITCHER regulator Pin-selected switching frequency, External compensation, Ceramic cap stable, Flat panel display power, High current LED driver 80V internal switch, selectable frequency
TopologyBoost, Flyback Boost, Flyback Boost, Flyback Boost 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 OutputNo, Yes 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 125 deg C 125 deg C
Regulator FamilySIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER

Datasheets
TitleSizeDateOther
Language
LM1577/LM2577 SIMPLE SWITCHER® Step-Up Voltage Regulator1406
Kbytes		14-Apr-05日本語


Featured Application Notes
TitleSizeDateOther
Language
AN-777: Application Note 777 LM2577 Three Output, Isolated Flyback Regulator112
Kbytes		26-Sep-02 
AN-776: Application Note 776 20 Watt Simple Switcher Forward Converter459
Kbytes		26-Sep-02 
AN-1061: Application Note 1061 Power Conversion in Line-Powered Equipment162
Kbytes		1-Oct-02日本語


More Application Notes
TitleSizeDateOther
Language
AN-1229: Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines229
Kbytes		1-May-04日本語
中文
AN-946: Application Note 946 High-Efficiency 3A Battery Chargers Use LM2576 Regulators109
Kbytes		3-Oct-02日本語

Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM2577M-ADJ/NOPB
LM2577M-ADJ

RoHS Status



SOIC WIDE		Full production
Lead Time: 8 weeks

 
DistributorRegionQty
ARROWWorldwide30
DIGIKEYWorldwide29
KEIKONGAsia Pacific1160
$3.12 each at 1K+ pcsrail
of
30
LM2577N-ADJ/NOPB
LM2577N-ADJ

RoHS Status



MDIP		Full production
Lead Time: 8 weeks

 
DistributorRegionQty
DIGIKEYWorldwide419
TAYLORAmericas142
$3.12 each at 1K+ pcsrail
of
20
LM2577S-12/NOPB
LM2577S-12

RoHS Status



TO-263		Full production
Lead Time: 8 weeks

 
DistributorRegionQty
ARROWWorldwide135
AVNET-EMWorldwide225
BRITESTONESouth Korea14
DIGIKEYWorldwide464
FUTUREWorldwide344
NEWARKAmericas48
$3.12 each at 1K+ pcsrail
of
45
LM2577S-ADJ/NOPB
LM2577S-ADJ

RoHS Status



TO-263		Full production
Lead Time: 16 weeks

Samples
DistributorRegionQty
ARROWWorldwide295
BRITESTONESouth Korea357
DIGIKEYWorldwide0
FUTUREWorldwide1100
NEWARKAmericas102
$3.12 each at 1K+ pcsrail
of
45
LM2577SX-12/NOPB
LM2577SX-12

RoHS Status



TO-263		Full production
Lead Time: 8 weeks

 
DistributorRegionQty
AVNET-EMWorldwide500
DIGIKEYWorldwide0
$3.12 each at 1K+ pcsreel
of
500
LM2577SX-ADJ/NOPB
LM2577SX-ADJ

RoHS Status



TO-263		Full production
Lead Time: 16 weeks

 
DistributorRegionQty
ARROWWorldwide500
AVNET-EMWorldwide500
DIGIKEYWorldwide0
FUTUREWorldwide970
$3.12 each at 1K+ pcsreel
of
500
LM2577T-12/NOPB
LM2577T-12

RoHS Status



TO-220		Full production
Lead Time: 16 weeks

Samples
DistributorRegionQty
ARROWWorldwide135
AVNET-EMWorldwide90
DIGIKEYWorldwide123
FUTUREWorldwide1100
KEIKONGAsia Pacific4390
NEWARKAmericas160
RS COMPONENTSWorldwide53
RSL MICROAsia Pacific2175
TECHMOSAAsia Pacific1800
$3.12 each at 1K+ pcsrail
of
45
LM2577T-15/NOPB
LM2577T-15

RoHS Status



TO-220		Full production
Lead Time: 16 weeks

 
DistributorRegionQty
ARROWWorldwide240
AVNET-EMWorldwide25
DIGIKEYWorldwide129
FARNELLEurope and Asia168
KEIKONGAsia Pacific1590
NEWARKAmericas8
$3.12 each at 1K+ pcsrail
of
45
LM2577T-ADJ/NOPB
LM2577T-ADJ

RoHS Status



TO-220		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide150
AVNET-EMWorldwide80
DIGIKEYWorldwide0
FARNELLEurope and Asia1317
FUTUREWorldwide1100
KEIKONGAsia Pacific405
NEWARKAmericas1409
RS COMPONENTSWorldwide40
TAYLORAmericas6725
$3.12 each at 1K+ pcsrail
of
45

Obsolete Versions
Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM2577-ADJ MDC
NONE
NATIONAL SEMICONDUCTOR
03 Dec 2008
LM2577M-12
LM2577S-ADJ
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2577M-15
LM2585S-ADJ
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM2577MX-12
LM2585SX-12
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2577MX-15
LM2585SX-ADJ
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM2577MX-ADJ
LM2585SX-ADJ
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2577N-12
LM2585S-12
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2577N-15
LM2585S-ADJ
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM2577S-15
LM2585S-ADJ
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM2577SX-15
LM2585SX-ADJ
NATIONAL SEMICONDUCTOR
16 Nov 2008

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Part Number(s)
(NSID)		Top ViewTypePinsMSL RatingPeak ReflowRoHS
Status		CAD SymbolsModelsPackage
Marking
Format
LM2577M-ADJ/NOPB
LM2577M-ADJ
SOIC WIDE243
3		260
260		DetailN/AN/A
NSUZXYTTE#
LM2577M
-ADJ P+
LM2577N-ADJ/NOPB
LM2577N-ADJ
MDIP161
1		NA
NA		DetailN/AN/A
NSUZXYYTTE#
LM2577N-ADJ
P+
LM2577S-12/NOPB
LM2577S-12
TO-26353
3		245
235		DetailN/AN/A
NSUZXYTTE#
LM2577S
-12 P+
LM2577S-ADJ/NOPB
LM2577S-ADJ
TO-26353
3		245
235		DetailN/AN/A
NSUZXYTTE#
LM2577S
-ADJ P+
LM2577SX-12/NOPB
LM2577SX-12
TO-26353
3		245
235		DetailN/AN/A
NSUZXYTTE#
LM2577S
-12 P+
LM2577SX-ADJ/NOPB
LM2577SX-ADJ
TO-26353
3		245
235		DetailN/AN/A
NSUZXYTTE#
LM2577S
-ADJ P+
LM2577T-12/NOPB
LM2577T-12
TO-22051
1		NA
NA		DetailN/AN/A
NSUZXYTTE#
LM2577T-12
P+
LM2577T-15/NOPB
LM2577T-15
TO-22051
1		NA
NA		DetailN/AN/A
NSUZXYTTE#
LM2577T-15
P+
LM2577T-ADJ/NOPB
LM2577T-ADJ
TO-22051
1		NA
NA		DetailN/AN/A
NSUZXYTTE#
LM2577T
-ADJ
P+

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Design Tools
TitleSizeDate
SimpleSwitcher® DC-DC Converters Design Software  

CAD Symbols and Models
N/A
 Models
N/A

WEBENCH Power Designer My Designs

LM2577
 
3.50 <=		 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


What are WEBENCH® tools?

Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM2577M-12SLM04404600353250011002356520
LM2577M-ADJSLM04404600353250011002356520
LM2577MX-12SLM04404600353250011002356520
LM2577MX-ADJSLM04404600353250011002356520
LM2577N-12SLM04404600353250011002356520
LM2577N-15SLM04404600353250011002356520
LM2577N-ADJSLM04404600353250011002356520
LM2577S-12SLM04404600353250011002356520
LM2577S-15SLM04404600353250011002356520
LM2577S-ADJSLM04404600353250011002356520
LM2577SX-12SLM04404600353250011002356520
LM2577SX-15SLM04404600353250011002356520
LM2577SX-ADJSLM04404600353250011002356520
LM2577T-12SLM04404600353250011002356520
LM2577T-15SLM04404600353250011002356520
LM2577T-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.


All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Obsolete Versions
Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM2577-ADJ MDC
NONE
NATIONAL SEMICONDUCTOR
03 Dec 2008
LM2577M-12
LM2577S-ADJ
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2577M-15
LM2585S-ADJ
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM2577MX-12
LM2585SX-12
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2577MX-15
LM2585SX-ADJ
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM2577MX-ADJ
LM2585SX-ADJ
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2577N-12
LM2585S-12
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2577N-15
LM2585S-ADJ
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM2577S-15
LM2585S-ADJ
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM2577SX-15
LM2585SX-ADJ
NATIONAL SEMICONDUCTOR
16 Nov 2008

[Information as of 9-Feb-2010]