LM2576   
SIMPLE SWITCHER® 3A Step-Down Voltage Regulator 		Click link to Download

Features
•3.3V, 5V, 12V, 15V, and adjustable output versions
•Adjustable version output voltage range, 1.23V to 37V (57V for HV version) ±4% max over line and load conditions
•Guaranteed 3A output current
•Wide input voltage range, 40V up to 60V for HV version
•Requires only 4 external components
•52 kHz fixed frequency internal oscillator
•TTL shutdown capability, low power standby mode
•High efficiency
•Uses readily available standard inductors
•Thermal shutdown and current limit protection
•P+ Product Enhancement tested

Description

The LM2576 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed-frequency oscillator.

The LM2576 series offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially reduces the size of the heat sink, and in some cases no heat sink is required.

A standard series of inductors optimized for use with the LM2576 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a guaranteed ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50 µA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

Applications
•Simple high-efficiency step-down (buck) regulator
•Efficient pre-regulator for linear regulators
•On-card switching regulators
•Positive to negative converter (Buck-Boost)
WEBENCH Power Designer My Designs

LM2576
 
6.00 <=		 V in Lower
 V		  
<=		 V in Upper
 V		  
<= 40.00
V out 1.24 <=  V <= 37.00
I out    A <= 3.00
Ambient Temperature  °C <= 100


What are WEBENCH® tools?

Also Recommended
LM25005▲Enhanced Package, More Efficient And Better Transient Response
LM25576▲Enhanced Package, More Efficient And Better Transient Response
LM2596▲More Efficient
LM2599▲Improved Switching Frequency, And Efficiency
LM2673▲Much Improved Switching Frequency
LM2676▲Much Improved Efficiency And Switching Frequency
LM2696▲Higher Efficiency, Enhanced Package, Better Transient Response
LM5005▲Higher Input Voltage, Higher Switching Frequency With Sync
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                                              LM2576
Drag-Select for Table Reset Graph
Also Recommended
LM25005▲Enhanced Package, More Efficient And Better Transient Response
LM25576▲Enhanced Package, More Efficient And Better Transient Response
LM2596▲More Efficient
LM2599▲Improved Switching Frequency, And Efficiency
LM2673▲Much Improved Switching Frequency
LM2676▲Much Improved Efficiency And Switching Frequency
LM2696▲Higher Efficiency, Enhanced Package, Better Transient Response
LM5005▲Higher Input Voltage, Higher Switching Frequency With Sync

Block Diagram
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Typical Performance
*click for larger image


Paramaters / ValuesLM2576 LM25005 LM25576 LM2596 LM2599 LM2673 LM2676 LM2696 LM5005
Output Current3000 mA 2500 mA 3000 mA 3000 mA 3000 mA 3000 mA 3000 mA 3000 mA 2500 mA
Input Min Voltage4 Volt 7 Volt 6 Volt 4.5, 7, 4.75, 15 Volt 4.5, 7, 4.75, 15 Volt 15, 8 Volt 15, 8 Volt 4.5 Volt 7 Volt
Input Max Voltage40 Volt 42 Volt 42 Volt 40 Volt 40 Volt 40 Volt 40 Volt 24 Volt 75 Volt
Output Min3.3, 1.23, 12, 15, 5 Volt 1.23 Volt 1.23 Volt 3.3, 1.23, 12, 5 Volt 3.3, 1.23, 12, 5 Volt 3.3, 1.23, 12, 5 Volt 3.3, 1.23, 12, 5 Volt 1.254 Volt 1.23 Volt
Output Max3.3, 37, 12, 15, 5 Volt 37 Volt 40 Volt 3.3, 37, 12, 5 Volt 3.3, 37, 12, 5 Volt 3.3, 12, 37, 5 Volt 3.3, 12, 37, 5 Volt 20 Volt 70 Volt
Frequency Min52 kHz 50 kHz 50 kHz 150 kHz 150 kHz 260 kHz 260 kHz 100 kHz 50 kHz
Frequency Max52 kHz 500 kHz 1000 kHz 150 kHz 150 kHz 260 kHz 260 kHz 500 kHz 500 kHz
Efficiency (peak)77, 88, 75 % 94 % 91 % 90, 73, 80 % 90 % 94, 88, 86 % 94, 88, 86 % 90 % 94 %
On/Off PinYes Yes Yes Yes Yes No Yes Yes Yes
Error FlagNo No No No Yes No No Yes No
SoftStartNo Yes Yes No Yes Yes No Yes Yes
Sync PinNo Yes Yes No No No No No Yes
InvertingYes Yes Yes Yes Yes Yes Yes
FlybackNo No No No No No No No No
RegTypeSwitching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Regulator
Temperature Min-40 deg C -40 deg C -40 deg C -40 deg C -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 125 deg C 125 deg C 125 deg C 125 deg C
Adjustable OutputYes, No Yes Yes Yes, No Yes, No Yes, No Yes, No Yes Yes
Adj Switch FrequencyNo Yes Yes No No No No Yes Yes
PWM ModeVoltage Current Current Voltage Voltage Voltage with Vin Feedforward Voltage with Vin Feedforward Constant on-time Current
TopologyBuck Buck, Inverting Buck Buck Buck Buck Buck Buck Buck
Special FeaturesSIMPLE SWITCHER regulator 1.5% feedback voltage accuracy, emulated current mode 1.5% feedback voltage accuracy, emulated current mode SIMPLE SWITCHER regulator SIMPLE SWITCHER regulator, error output delay Programmable current limit, 2% output voltage accuracy, SIMPLE SWITCHER regulator Internal Type 3 compensation, 2% output voltage accuracy, SIMPLE SWITCHER regulator No compensation required, ultra-fast transient response, thermal shutdown 1.5% feedback voltage accuracy, emulated current mode
Step-DownYes Yes Yes Yes Yes Yes Yes Yes Yes
Multiple Output CapabilityNo No No No No No No No No
Output PowerUndefined Watt Undefined Watt Undefined Watt Undefined Watt Undefined Watt Undefined Watt Undefined Watt
Output Voltage3.3, Undefined, 12, 15, 5 Volt Undefined Volt 3.3, Undefined, 12, 5 Volt 3.3, Undefined, 12, 5 Volt 3.3, 12, Undefined, 5 Volt 3.3, 12, Undefined, 5 Volt Undefined Volt
Output Range15V, 5V, 12V, 1.23V to 65V, 3.3V 1.23V to 37V 1.23V to 37V 5V, 12V, 1.23V to 37V, 3.3V 5V, 12V, 1.23V to 37V, 3.3V 12V, 1.23V to 37V, 3.3V, 5V 12V, 1.23V to 37V, 3.3V, 5V 1.254V to 20V 1.23V to 70V
Switching Frequency52 kHz 500 kHz 1000 kHz 150 kHz 150 kHz 260 kHz 260 kHz 500 kHz 500 kHz
Regulator FamilySIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER Undefined
Synchronous RectificationNo No No No No No No No No

Datasheets
TitleSizeDateOther
Language
LM2576/LM2576HV Series SIMPLE SWITCHER® 3A Step-Down Voltage Regulator750
Kbytes		3-Aug-04日本語


Featured Application Notes
TitleSizeDateOther
Language
AN-946: Application Note 946 High-Efficiency 3A Battery Chargers Use LM2576 Regulators109
Kbytes		3-Oct-02日本語
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-777: Application Note 777 LM2577 Three Output, Isolated Flyback Regulator112
Kbytes		26-Sep-02 

Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM2576S-12/NOPB
LM2576S-12

RoHS Status



TO-263		Full production
Lead Time: 16 weeks

 
DistributorRegionQty
ARROWWorldwide122
AVNET-EMWorldwide1
DIGIKEYWorldwide400
FUTUREWorldwide60
RS COMPONENTSWorldwide150
$1.44 each at 1K+ pcsrail
of
45
LM2576S-3.3/NOPB
LM2576S-3.3

RoHS Status



TO-263		Full production
Lead Time: 16 weeks

Samples
DistributorRegionQty
ARROWWorldwide109
BRITESTONESouth Korea533
DIGIKEYWorldwide471
FUTUREWorldwide1100
KEIKONGAsia Pacific40
NEWARKAmericas974
RS COMPONENTSWorldwide92
$1.44 each at 1K+ pcsrail
of
45
LM2576S-5.0/NOPB
LM2576S-5.0

RoHS Status



TO-263		Full production
Lead Time: 16 weeks

Samples
DistributorRegionQty
ARROWWorldwide226
BRITESTONESouth Korea10
DIGIKEYWorldwide507
FUTUREWorldwide1100
RS COMPONENTSWorldwide172
TAYLORAmericas1530
$1.44 each at 1K+ pcsrail
of
45
LM2576S-ADJ/NOPB
LM2576S-ADJ

RoHS Status



TO-263		Full production
Lead Time: 16 weeks

Samples
DistributorRegionQty
ARROWWorldwide15
DIGIKEYWorldwide988
FUTUREWorldwide1100
NEWARKAmericas1555
RS COMPONENTSWorldwide454
TAYLORAmericas530
$1.44 each at 1K+ pcsrail
of
45
LM2576SX-3.3/NOPB
LM2576SX-3.3

RoHS Status



TO-263		Full production
Lead Time: 16 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
FUTUREWorldwide400
KEIKONGAsia Pacific7000
$1.44 each at 1K+ pcsreel
of
500
LM2576SX-5.0/NOPB
LM2576SX-5.0

RoHS Status



TO-263		Full production
Lead Time: 16 weeks

 
DistributorRegionQty
ARROWWorldwide1500
DIGIKEYWorldwide0
FUTUREWorldwide1100
KEIKONGAsia Pacific4500
$1.44 each at 1K+ pcsreel
of
500
LM2576SX-ADJ/NOPB
LM2576SX-ADJ

RoHS Status



TO-263		Full production
Lead Time: 16 weeks

 
DistributorRegionQty
ARROWWorldwide500
AVNET-EMWorldwide500
DIGIKEYWorldwide0
FUTUREWorldwide1100
KEIKONGAsia Pacific22500
$1.44 each at 1K+ pcsreel
of
500
LM2576T-12/NOPB
LM2576T-12

RoHS Status



TO-220		Full production
Lead Time: 16 weeks

Samples
DistributorRegionQty
ARROWWorldwide64
DIGIKEYWorldwide2
FARNELLEurope and Asia607
FUTUREWorldwide1100
NEWARKAmericas240
RS COMPONENTSWorldwide356
TAYLORAmericas1570
$1.44 each at 1K+ pcsrail
of
45
LM2576T-15/NOPB
LM2576T-15

RoHS Status



TO-220		Full production
Lead Time: 16 weeks

 
DistributorRegionQty
ARROWWorldwide316
DIGIKEYWorldwide778
FARNELLEurope and Asia314
FUTUREWorldwide298
KEIKONGAsia Pacific935
RS COMPONENTSWorldwide60
$1.44 each at 1K+ pcsrail
of
45
LM2576T-3.3/NOPB
LM2576T-3.3

RoHS Status



TO-220		Full production
Lead Time: 16 weeks

Samples
DistributorRegionQty
AECO TECHAsia Pacific1000
ARROWWorldwide670
DIGIKEYWorldwide140
FARNELLEurope and Asia366
FUTUREWorldwide298
KEIKONGAsia Pacific8277
RS COMPONENTSWorldwide91
$1.44 each at 1K+ pcsrail
of
45
LM2576T-5.0/NOPB
LM2576T-5.0

RoHS Status



TO-220		Full production
Lead Time: 16 weeks

Samples
DistributorRegionQty
ARROWWorldwide203
AVNET-EMWorldwide178
BRITESTONESouth Korea32
DIGIKEYWorldwide264
FARNELLEurope and Asia944
FUTUREWorldwide1100
KEIKONGAsia Pacific48363
NEWARKAmericas1651
RS COMPONENTSWorldwide401
TAYLORAmericas18592
$1.44 each at 1K+ pcsrail
of
45
LM2576T-ADJ/NOPB
LM2576T-ADJ

RoHS Status



TO-220		Full production
Lead Time: 16 weeks

Samples
DistributorRegionQty
BRITESTONESouth Korea71
DIGIKEYWorldwide1118
FARNELLEurope and Asia1321
FUTUREWorldwide1100
KEIKONGAsia Pacific25705
NEWARKAmericas280
RS COMPONENTSWorldwide312
TAYLORAmericas1456
$1.44 each at 1K+ pcsrail
of
45

Obsolete Versions
Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM2576HVS-15
LM22676MR-ADJ
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM2576HVSX-15
LM22676MRX-ADJ
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM2576HVT-3.3
LM22676MR-ADJ
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2576S-15
LM22676MR-ADJ
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM2576SX-12
LM22676TJX-ADJ
NATIONAL SEMICONDUCTOR
01 Dec 2009

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
LM2576S-12/NOPB
LM2576S-12
TO-26353
3		245
235		DetailN/AN/A
NSUZXYTTE#
LM2576S
-12 P+
LM2576S-3.3/NOPB
LM2576S-3.3
TO-26353
3		245
235		DetailN/AN/A
NSUZXYTTE#
LM2576S
-3.3 P+
LM2576S-5.0/NOPB
LM2576S-5.0
TO-26353
3		245
235		DetailN/AN/A
NSUZXYTTE#
LM2576S
-5.0 P+
LM2576S-ADJ/NOPB
LM2576S-ADJ
TO-26353
3		245
235		DetailN/AN/A
NSUZXYTTE#
LM2576S
-ADJ P+
LM2576SX-3.3/NOPB
LM2576SX-3.3
TO-26353
3		245
235		DetailN/AN/A
NSUZXYTTE#
LM2576S
-3.3 P+
LM2576SX-5.0/NOPB
LM2576SX-5.0
TO-26353
3		245
235		DetailN/AN/A
NSUZXYTTE#
LM2576S
-5.0 P+
LM2576SX-ADJ/NOPB
LM2576SX-ADJ
TO-26353
3		245
235		DetailN/AN/A
NSUZXYTTE#
LM2576S
-ADJ P+
LM2576T-12/NOPB
LM2576T-12
TO-22051
1		NA
NA		DetailN/AN/A
NSUZXYTTE#
LM2576T
-12 P+
LM2576T-15/NOPB
LM2576T-15
TO-22051
1		NA
NA		DetailN/AN/A
NSUZXYTTE#
LM2576T
-15 P+
LM2576T-3.3/NOPB
LM2576T-3.3
TO-22051
1		NA
NA		DetailN/AN/A
NSUZXYTTE#
LM2576T
-3.3 P+
LM2576T-5.0/NOPB
LM2576T-5.0
TO-22051
1		NA
NA		DetailN/AN/A
NSUZXYTTE#
LM2576T
-5.0 P+
LM2576T-ADJ/NOPB
LM2576T-ADJ
TO-22051
1		NA
NA		DetailN/AN/A
NSUZXYTTE#
LM2576T
-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

LM2576
 
6.00 <=		 V in Lower
 V		  
<=		 V in Upper
 V		  
<= 40.00
V out 1.24 <=  V <= 37.00
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)
LM2576S-12SLM04404600353250011002356520
LM2576S-3.3SLM04404600353250011002356520
LM2576S-5.0SLM04404600353250011002356520
LM2576S-ADJSLM04404600353250011002356520
LM2576SX-12SLM04404600353250011002356520
LM2576SX-15SLM04404600353250011002356520
LM2576SX-3.3SLM04404600353250011002356520
LM2576SX-5.0SLM04404600353250011002356520
LM2576SX-ADJSLM04404600353250011002356520
LM2576T-12SLM04404600353250011002356520
LM2576T-15SLM04404600353250011002356520
LM2576T-3.3SLM04404600353250011002356520
LM2576T-5.0SLM04404600353250011002356520
LM2576T-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
LM2576HVS-15
LM22676MR-ADJ
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM2576HVSX-15
LM22676MRX-ADJ
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM2576HVT-3.3
LM22676MR-ADJ
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2576S-15
LM22676MR-ADJ
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM2576SX-12
LM22676TJX-ADJ
NATIONAL SEMICONDUCTOR
01 Dec 2009

[Information as of 9-Feb-2010]