National Semiconductor | High-performance Analog

 

 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)

    • Also Recommended
    LM25005▲Enhanced Package, More Efficient And Better Transient Response
    LM25576▲Enhanced Package, More Efficient And Better Transient Response
    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
    LM2596▲More Efficient
    LM2599▲Improved Switching Frequency, And Efficiency

    		Block Diagram
    click for larger image



    Typical Performance
    *click for larger image


    Parameters / ValuesLM2576 LM25005 LM25576 LM2673 LM2676 LM2696 LM5005 LM2596 LM2599
    Output Current3000 mA 2500 mA 3000 mA 3000 mA 3000 mA 3000 mA 2500 mA 3000 mA 3000 mA
    Input Min Voltage4 Volt 7 Volt 6 Volt 15, 8 Volt 15, 8 Volt 4.5 Volt 7 Volt 4.5, 7, 4.75, 15 Volt 4.5, 7, 4.75, 15 Volt
    Input Max Voltage40 Volt 42 Volt 42 Volt 40 Volt 40 Volt 24 Volt 75 Volt 40 Volt 40 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 1.254 Volt 1.23 Volt 3.3, 1.23, 12, 5 Volt 3.3, 1.23, 12, 5 Volt
    Output Max3.3, 37, 12, 15, 5 Volt 37 Volt 40 Volt 3.3, 12, 37, 5 Volt 3.3, 12, 37, 5 Volt 20 Volt 70 Volt 3.3, 37, 12, 5 Volt 3.3, 37, 12, 5 Volt
    Frequency Min52 kHz 50 kHz 50 kHz 260 kHz 260 kHz 100 kHz 50 kHz 150 kHz 150 kHz
    Frequency Max52 kHz 500 kHz 1000 kHz 260 kHz 260 kHz 500 kHz 500 kHz 150 kHz 150 kHz
    Efficiency (peak)77, 88, 75 % 94 % 91 % 94, 88, 86 % 94, 88, 86 % 90 % 94 % 90, 73, 80 % 90 %
    On/Off PinYes Yes Yes No Yes Yes Yes Yes Yes
    PowerGood / Error FlagNo No No No No Yes No No Yes
    SoftStartNo Yes Yes Yes No Yes Yes No Yes
    Sync PinNo Yes Yes No No No Yes No No
    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 Yes Yes, No Yes, No
    Adj Switch FrequencyNo Yes Yes No No Yes Yes No No
    PWM ModeVoltage Current Current Voltage with Vin Feedforward Voltage with Vin Feedforward Constant on-time Current Voltage Voltage
    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 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 SIMPLE SWITCHER regulator SIMPLE SWITCHER regulator, error output delay
    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, 12, Undefined, 5 Volt 3.3, 12, Undefined, 5 Volt Undefined Volt 3.3, Undefined, 12, 5 Volt 3.3, Undefined, 12, 5 Volt
    Output Range15V, 5V, 12V, 1.23V to 65V, 3.3V 1.23V to 37V 1.23V to 37V 12V, 1.23V to 37V, 3.3V, 5V 12V, 1.23V to 37V, 3.3V, 5V 1.254V to 20V 1.23V to 70V 5V, 12V, 1.23V to 37V, 3.3V 5V, 12V, 1.23V to 37V, 3.3V
    Switching Frequency52 kHz 500 kHz 1000 kHz 260 kHz 260 kHz 500 kHz 500 kHz 150 kHz 150 kHz
    Regulator FamilySIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER Undefined SIMPLE SWITCHER SIMPLE SWITCHER
    Synchronous RectificationNo No No No No No No No No

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


    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 


    Other Technical Documents
    TitleTypeDate
    Buck Converters Provide a Battery Charger and System PowerApp Note 2007-03-21
    Battery ChargingApp Note 2007-03-21
    Linear and Switching Voltage Regulator Fundamental Part 2Conference Paper 2007-03-21

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

    LM2576S-12

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide54
    AVNET-EMWorldwide240
    DIGI-KEYWorldwide225
    MOUSERWorldwide190
    NEWARKAmericas26
    RS COMPONENTSWorldwide150
    TAYLORAmericas3519
    		$1.26 each at 1K+ pcsrail
    of
    45
    LM2576S-3.3/NOPB

    LM2576S-3.3

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1461
    AVNET-EMWorldwide325
    BRITESTONESouth Korea533
    DIGI-KEYWorldwide609
    MOUSERWorldwide446
    NEWARKAmericas296
    RS COMPONENTSWorldwide92
    TAYLORAmericas1461
    		$1.26 each at 1K+ pcsrail
    of
    45
    LM2576S-5.0/NOPB

    LM2576S-5.0

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide20
    BRITESTONESouth Korea10
    DIGI-KEYWorldwide1923
    MOUSERWorldwide57
    NEWARKAmericas570
    RS COMPONENTSWorldwide172
    TAYLORAmericas245
    		$1.26 each at 1K+ pcsrail
    of
    45
    LM2576S-ADJ/NOPB

    LM2576S-ADJ

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide65
    AVNET-EMWorldwide2353
    DIGI-KEYWorldwide6622
    FARNELLEurope and Asia1888
    MOUSERWorldwide285
    NEWARKAmericas2111
    RS COMPONENTSWorldwide454
    TAYLORAmericas4306
    		$1.26 each at 1K+ pcsrail
    of
    45
    LM2576SX-3.3/NOPB

    LM2576SX-3.3

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide150
    		$1.26 each at 1K+ pcsreel
    of
    500
    LM2576SX-5.0/NOPB

    LM2576SX-5.0

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide1159
    AVNET-EMWorldwide1000
    DIGI-KEYWorldwide0
    MOUSERWorldwide342
    RSL MICROAsia Pacific31000
    TAYLORAmericas1159
    		$1.26 each at 1K+ pcsreel
    of
    500
    LM2576SX-ADJ/NOPB

    LM2576SX-ADJ

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide460
    DIGI-KEYWorldwide0
    MOUSERWorldwide232
    RSL MICROAsia Pacific17500
    TAYLORAmericas31673
    		$1.26 each at 1K+ pcsreel
    of
    500
    LM2576T-12/NOPB

    LM2576T-12

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide54
    AVNET-EMWorldwide34
    DIGI-KEYWorldwide85
    FARNELLEurope and Asia626
    MOUSERWorldwide150
    NEWARKAmericas345
    RS COMPONENTSWorldwide356
    RSL MICROAsia Pacific10485
    TAYLORAmericas368
    		$1.26 each at 1K+ pcsrail
    of
    45
    LM2576T-15/NOPB

    LM2576T-15

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide31
    FARNELLEurope and Asia264
    MOUSERWorldwide65
    NEWARKAmericas37
    RS COMPONENTSWorldwide60
    		$1.26 each at 1K+ pcsrail
    of
    45
    LM2576T-3.3/NOPB

    LM2576T-3.3

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AECO TECHAsia Pacific1000
    ARROWWorldwide305
    AVNET-EMWorldwide288
    DIGI-KEYWorldwide294
    MOUSERWorldwide213
    NEWARKAmericas189
    RS COMPONENTSWorldwide91
    		$1.26 each at 1K+ pcsrail
    of
    45
    LM2576T-5.0/NOPB

    LM2576T-5.0

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide323
    AVNET-EMWorldwide6939
    BRITESTONESouth Korea32
    DIGI-KEYWorldwide0
    MOUSERWorldwide339
    NEWARKAmericas342
    RS COMPONENTSWorldwide401
    RSL MICROAsia Pacific35460
    TAYLORAmericas4660
    		$1.26 each at 1K+ pcsrail
    of
    45
    LM2576T-ADJ/NOPB

    LM2576T-ADJ

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide738
    AVNET-EMWorldwide5
    BRITESTONESouth Korea71
    CEACAsia Pacific1620
    DIGI-KEYWorldwide1647
    FARNELLEurope and Asia5614
    MOUSERWorldwide520
    NEWARKAmericas763
    RS COMPONENTSWorldwide312
    RSL MICROAsia Pacific41760
    TAYLORAmericas3200
    		$1.26 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/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM2576.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM2576 is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LM2576S-12/NOPB

    LM2576S-12
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailN/AN/A
    		NSUZXYTTE#
    LM2576S
    -12 P+
    LM2576S-3.3/NOPB

    LM2576S-3.3
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailN/AN/A
    		NSUZXYTTE#
    LM2576S
    -3.3 P+
    LM2576S-5.0/NOPB

    LM2576S-5.0
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailN/AN/A
    		NSUZXYTTE#
    LM2576S
    -5.0 P+
    LM2576S-ADJ/NOPB

    LM2576S-ADJ
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailN/AN/A
    		NSUZXYTTE#
    LM2576S
    -ADJ P+
    LM2576SX-3.3/NOPB

    LM2576SX-3.3
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailN/AN/A
    		NSUZXYTTE#
    LM2576S
    -3.3 P+
    LM2576SX-5.0/NOPB

    LM2576SX-5.0
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailN/AN/A
    		NSUZXYTTE#
    LM2576S
    -5.0 P+
    LM2576SX-ADJ/NOPB

    LM2576SX-ADJ
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailN/AN/A
    		NSUZXYTTE#
    LM2576S
    -ADJ P+
    LM2576T-12/NOPB

    LM2576T-12
    		1905.986
    1908.876
    		TO-22051
    1    		NA
    NA    		DetailN/AN/A
    		NSUZXYTTE#
    LM2576T
    -12 P+
    LM2576T-15/NOPB

    LM2576T-15
    		1905.986
    1908.876
    		TO-22051
    1    		NA
    NA    		DetailN/AN/A
    		NSUZXYTTE#
    LM2576T
    -15 P+
    LM2576T-3.3/NOPB

    LM2576T-3.3
    		1905.986
    1908.876
    		TO-22051
    1    		NA
    NA    		DetailN/AN/A
    		NSUZXYTTE#
    LM2576T
    -3.3 P+
    LM2576T-5.0/NOPB

    LM2576T-5.0
    		1905.986
    1908.876
    		TO-22051
    1    		NA
    NA    		DetailN/AN/A
    		NSUZXYTTE#
    LM2576T
    -5.0 P+
    LM2576T-ADJ/NOPB

    LM2576T-ADJ
    		1905.986
    1908.876
    		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/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM2576.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM2576 is located at RoHS Status.

    Design Tools
    TitleSizeDate
    SimpleSwitcher® DC-DC Converters Design Software  

    CAD Symbols and Models
    N/A
    		 Models
    N/A


    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-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/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM2576.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM2576 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 6-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation