National Semiconductor | High-performance Analog

 

 LM2596   
SIMPLE SWITCHER Power Converter 150 KHz 3A Step-Down Voltage Regulator 		Click link to Download

Features
  • 3.3V, 5V, 12V, and adjustable output versions
  • Adjustable version output voltage range, 1.2V to 37V ±4% max over line and load conditions
  • Available in TO-220 and TO-263 packages
  • Guaranteed 3A output load current
  • Input voltage range up to 40V
  • Requires only 4 external components
  • Excellent line and load regulation specifications
  • 150 kHz fixed frequency internal oscillator
  • TTL shutdown capability
  • Low power standby mode, IQ typically 80 µA
  • High efficiency
  • Uses readily available standard inductors
  • Thermal shutdown and current limit protection

    • Description

    The LM2596 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 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 LM2596 series operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Available in a standard 5-lead TO-220 package with several different lead bend options, and a 5-lead TO-263 surface mount package.

    A standard series of inductors are available from several different manufacturers optimized for use with the LM2596 series. This feature greatly simplifies the design of switch-mode power supplies.

    Other features include a guaranteed ±4% tolerance on output voltage under specified input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 80 µA standby current. Self protection features include a two stage frequency reducing current limit for the output switch and an over temperature shutdown for complete protection under fault conditions.


    Applications

  • Simple high-efficiency step-down (buck) regulator
  • On-card switching regulators
  • Positive to negative converter

    • WEBENCH® LM2596
        Min   Max   Range  
      VIN – V    4.50 – 40.00V  
      VOUT V    1.23 – 40.00V  
      IOUT A    ≤ 3.00A  
      Ambient Temp °C    ≤ 100°C  
    Footprint BOM Cost Efficiency
    What are WEBENCH® tools?


    Also Recommended
    LM2670▲Higher Switching Freq. W/ Freq. Synchronization And Enable Pin
    LM2673▲Higher Switching Freq. W/ Soft Start And Prog. Current Limit
    LM2676▲Higher Switching Frequency, Smaller Package
    LM2678▲Higher Current (5A) And Higher Switching Freq.
    LM2599▲LM2596 W/ Error Flag, Soft Start And Shutdown Pin
    LM2650▲3A Synchronous Step-Down Regulator



    Typical Application
    click for larger image


    		Block Diagram
    click for larger image



    Typical Performance
    *click for larger image


    Parameters / ValuesLM2596 LM2670 LM2673 LM2676 LM2678 LM2599 LM2650
    Output Current3000 mA 3000 mA 3000 mA 3000 mA 5000 mA 3000 mA 3000 mA
    Input Min Voltage4.5, 7, 4.75, 15 Volt 8 Volt 15, 8 Volt 15, 8 Volt 15, 8 Volt 4.5, 7, 4.75, 15 Volt 4.5 Volt
    Input Max Voltage40 Volt 40 Volt 40 Volt 40 Volt 40 Volt 40 Volt 18 Volt
    Output Min3.3, 1.23, 12, 5 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 1.5 Volt
    Output Max3.3, 37, 12, 5 Volt 37 Volt 3.3, 12, 37, 5 Volt 3.3, 12, 37, 5 Volt 3.3, 12, 37, 5 Volt 3.3, 37, 12, 5 Volt 16 Volt
    Frequency Min150 kHz 260 kHz 260 kHz 260 kHz 260 kHz 150 kHz 90 kHz
    Frequency Max150 kHz 260 kHz 260 kHz 260 kHz 260 kHz 150 kHz 300 kHz
    Efficiency (peak)90, 73, 80 % 94 % 94, 88, 86 % 94, 88, 86 % 84, 92, 82 % 90 % 95 %
    On/Off PinYes Yes No Yes Yes Yes Yes
    PowerGood / Error FlagNo No No No No Yes No
    SoftStartNo No Yes No No Yes Yes
    Sync PinNo Yes No No No No Yes
    InvertingYes Yes No
    FlybackNo No No No No No No
    RegTypeSwitching 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
    Temperature Max125 deg C 125 deg C 125 deg C 125 deg C 125 deg C 125 deg C 125 deg C
    Adjustable OutputYes, No No Yes, No Yes, No Yes, No Yes, No Yes
    Adj Switch FrequencyNo No No No No No Yes
    PWM ModeVoltage Voltage with Vin Feedforward Voltage with Vin Feedforward Voltage with Vin Feedforward Voltage with Vin Feedforward Voltage Current Mode Control
    TopologyBuck Buck Buck Buck Buck Buck Synchronous Buck
    Special FeaturesSIMPLE SWITCHER regulator Internal Type 3 compensation, 2% output voltage accuracy, SIMPLE SWITCHER regulator Programmable current limit, 2% output voltage accuracy, SIMPLE SWITCHER regulator Internal Type 3 compensation, 2% output voltage accuracy, SIMPLE SWITCHER regulator Internal Type 3 compensation, 2% output voltage accuracy, SIMPLE SWITCHER regulator SIMPLE SWITCHER regulator, error output delay Max. Iq at shutdown is 25uA over full temp. range
    Step-DownYes Yes Yes Yes Yes Yes Yes
    Multiple Output CapabilityNo 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, 5 Volt 12 Volt 3.3, 12, Undefined, 5 Volt 3.3, 12, Undefined, 5 Volt 3.3, 12, Undefined, 5 Volt 3.3, Undefined, 12, 5 Volt
    Output Range5V, 12V, 1.23V to 37V, 3.3V 12V 12V, 1.23V to 37V, 3.3V, 5V 12V, 1.23V to 37V, 3.3V, 5V 12V, 1.23V to 37V, 3.3V, 5V 5V, 12V, 1.23V to 37V, 3.3V 1.5V to16V
    Switching Frequency150 kHz 260 kHz 260 kHz 260 kHz 260 kHz 150 kHz 90 kHz
    Regulator FamilySIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER Undefined
    Synchronous RectificationNo No No No No No Yes
    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2596S-12/NOPB

    LM2596S-12

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide45
    AVNET-EMWorldwide123
    DIGI-KEYWorldwide350
    FARNELLEurope and Asia187
    MOUSERWorldwide155
    NEWARKAmericas118
    RS COMPONENTSWorldwide48
    TAYLORAmericas45
    		$1.95 each at 1K+ pcsrail
    of
    45
    LM2596S-3.3/NOPB

    LM2596S-3.3

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide53
    AVNET-EMWorldwide1091
    DIGI-KEYWorldwide2556
    MOUSERWorldwide304
    NEWARKAmericas327
    RS COMPONENTSWorldwide82
    TAYLORAmericas5193
    		$1.95 each at 1K+ pcsrail
    of
    45
    LM2596S-5.0/NOPB

    LM2596S-5.0

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide180
    AVNET-EMWorldwide5784
    DIGI-KEYWorldwide3353
    MOUSERWorldwide257
    NEWARKAmericas1206
    RS COMPONENTSWorldwide163
    TAYLORAmericas845
    		$1.95 each at 1K+ pcsrail
    of
    45
    LM2596S-ADJ/NOPB

    LM2596S-ADJ

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide11619
    AVNET-EMWorldwide1090
    CEACAsia Pacific990
    DIGI-KEYWorldwide3723
    FARNELLEurope and Asia2496
    MOUSERWorldwide374
    NEWARKAmericas882
    RS COMPONENTSWorldwide104
    TAYLORAmericas11619
    		$1.95 each at 1K+ pcsrail
    of
    45
    LM2596SX-12/NOPB

    LM2596SX-12

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide1400
    AVNET-EMWorldwide1950
    DIGI-KEYWorldwide0
    MOUSERWorldwide250
    RSL MICROAsia Pacific7000
    TAYLORAmericas1400
    		$1.95 each at 1K+ pcsreel
    of
    500
    LM2596SX-3.3/NOPB

    LM2596SX-3.3

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide375
    AVNET-EMWorldwide500
    DIGI-KEYWorldwide0
    MOUSERWorldwide241
    RSL MICROAsia Pacific500
    TAYLORAmericas375
    		$1.95 each at 1K+ pcsreel
    of
    500
    LM2596SX-5.0/NOPB

    LM2596SX-5.0

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide500
    AVNET-EMWorldwide1500
    DIGI-KEYWorldwide500
    MOUSERWorldwide350
    NEWARKAmericas227
    TAYLORAmericas9833
    		$1.95 each at 1K+ pcsreel
    of
    500
    LM2596SX-ADJ/NOPB

    LM2596SX-ADJ

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide500
    AVNET-EMWorldwide17000
    CEACAsia Pacific6500
    DIGI-KEYWorldwide0
    FARNELLEurope and Asia145
    MOUSERWorldwide357
    NEWARKAmericas145
    TAYLORAmericas19585
    TECHMOSAAsia Pacific1000
    		$1.95 each at 1K+ pcsreel
    of
    500
    LM2596T-12/NOPB

    LM2596T-12

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide450
    AVNET-EMWorldwide114
    DIGI-KEYWorldwide578
    FARNELLEurope and Asia494
    MOUSERWorldwide70
    NEWARKAmericas114
    RS COMPONENTSWorldwide29
    TAYLORAmericas450
    		$1.95 each at 1K+ pcsrail
    of
    45
    LM2596T-3.3/NOPB

    LM2596T-3.3

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide50
    DIGI-KEYWorldwide617
    MOUSERWorldwide175
    RS COMPONENTSWorldwide28
    RSL MICROAsia Pacific5625
    		$1.95 each at 1K+ pcsrail
    of
    45
    LM2596T-5.0/NOPB

    LM2596T-5.0

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1260
    AVNET-EMWorldwide150
    DIGI-KEYWorldwide451
    MOUSERWorldwide257
    NEWARKAmericas119
    RS COMPONENTSWorldwide58
    RSL MICROAsia Pacific5400
    TAYLORAmericas1260
    		$1.95 each at 1K+ pcsrail
    of
    45
    LM2596T-ADJ/NOPB

    LM2596T-ADJ

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide50
    AVNET-EMWorldwide787
    BRITESTONESouth Korea8015
    DIGI-KEYWorldwide1320
    FARNELLEurope and Asia329
    MOUSERWorldwide379
    NEWARKAmericas332
    RS COMPONENTSWorldwide63
    RSL MICROAsia Pacific5625
    TAYLORAmericas1294
    		$1.95 each at 1K+ pcsrail
    of
    45

    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 LM2596.

    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 LM2596 is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LM2596S-12/NOPB

    LM2596S-12
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2596S
    -12 P+
    LM2596S-3.3/NOPB

    LM2596S-3.3
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2596S
    -3.3 P+
    LM2596S-5.0/NOPB

    LM2596S-5.0
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2596S
    -5.0 P+
    LM2596S-ADJ/NOPB

    LM2596S-ADJ
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2596S
    -ADJ P+
    LM2596SX-12/NOPB

    LM2596SX-12
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2596S
    -12 P+
    LM2596SX-3.3/NOPB

    LM2596SX-3.3
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2596S
    -3.3 P+
    LM2596SX-5.0/NOPB

    LM2596SX-5.0
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2596S
    -5.0 P+
    LM2596SX-ADJ/NOPB

    LM2596SX-ADJ
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2596S
    -ADJ P+
    LM2596T-12/NOPB

    LM2596T-12
    		1957.896
    1908.876
    		TO-22051
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2596T
    -12 P+
    LM2596T-3.3/NOPB

    LM2596T-3.3
    		1957.896
    1908.876
    		TO-22051
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2596T
    -3.3 P+
    LM2596T-5.0/NOPB

    LM2596T-5.0
    		1957.896
    1908.876
    		TO-22051
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2596T
    -5.0 P+
    LM2596T-ADJ/NOPB

    LM2596T-ADJ
    		1957.896
    1908.876
    		TO-22051
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2596T
    -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 LM2596.

    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 LM2596 is located at RoHS Status.

    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM2596S-12LB30003437100416450011181688246
    LM2596S-3.3LB30003437100416450011181688246
    LM2596S-5.0LB30003437100416450011181688246
    LM2596S-ADJLB30003437100416450011181688246
    LM2596SX-12LB30003437100416450011181688246
    LM2596SX-3.3LB30003437100416450011181688246
    LM2596SX-5.0LB30003437100416450011181688246
    LM2596SX-ADJLB30003437100416450011181688246
    LM2596T-12LB30003437100416450011181688246
    LM2596T-3.3LB30003437100416450011181688246
    LM2596T-5.0LB30003437100416450011181688246
    LM2596T-ADJLB30003437100416450011181688246

    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 LM2596.

    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 LM2596 is located at RoHS Status.

    [Information as of 7-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation