National Semiconductor | High-performance Analog

 

 LM2825   
Integrated Power Supply 1A DC-DC Converter 		Click link to Download

Features
  • Minimum design time required
  • 3.3V, 5V and 12V fixed output versions
  • Two adjustable versions allow 1.23V to 15V outputs
  • Wide input voltage range, up to 40V
  • Low-power standby mode, IQ typically 65 µA
  • High efficiency, typically 80%
  • ±4% output voltage tolerance
  • Excellent line and load regulation
  • TTL shutdown capability/programmable Soft-start
  • Thermal shutdown and current limit protection
  • -40°C to +85°C ambient temperature range

    • Description

    The LM2825 is a complete 1A DC-DC Buck converter packaged in a 24-lead molded Dual-In-Line integrated circuit package.

    Contained within the package are all the active and passive components for a high efficiency step-down (buck) switching regulator. Available in fixed output voltages of 3.3V, 5V and 12V, as well as two adjustable versions, these devices can provide up to 1A of load current with fully guaranteed electrical specifications.

    Self-contained, this converter is also fully protected from output fault conditions, such as excessive load current, short circuits, or excessive temperatures.


    Applications

  • Simple high-efficiency step-down (buck) regulator
  • On-card switching regulators
  • Efficient pre-regulator for linear regulators
  • Distributed power systems
  • DC/DC module replacement

    • Also Recommended
    LM25010▲Thermally Enhanced Package, Higher Efficiency, Higher Operating Frequency & Better Transient Respons
    LM2675▲Thermally Enhanced Package, Higher Efficiency And Higher Operating Frequency
    LM3100▲Thermally Enhanced Package, Higher Efficiency, Higher Operating Frequency & Better Transient Respons
    LM2595▲Thermally Enhanced Package, Higher Efficiency
    LM2598▲Thermally Enhanced Package, Higher Efficiency



    Typical Application
    *click for larger image


    		Connection Diagram
    click for larger image



    Typical Performance
    *click for larger image


    Parameters / ValuesLM2825 LM25010 LM2675 LM3100 LM2595 LM2598
    Output Current1000 mA 1000 mA 1000 mA 1500 mA 1000 mA 1000 mA
    Input Min Voltage4.5, 7, 4.75, 15 Volt 6 Volt 6.5, 15 Volt 4.5 Volt 4.5, 7, 4.75, 15 Volt 4.5, 7, 4.75, 15 Volt
    Input Max Voltage40 Volt 42 Volt 40 Volt 36 Volt 40 Volt 40 Volt
    Output Min7, 3.3, 1.23, 12, 5 Volt 2.5 Volt 3.3, 1.23, 12, 5 Volt 0.8 Volt 3.3, 1.23, 12, 5 Volt 3.3, 1.23, 12, 5 Volt
    Output Max3.3, 12, 15, 8, 5 Volt 37 Volt 3.3, 12, 37, 5 Volt 7 Volt 3.3, 37, 12, 5 Volt 3.3, 37, 12, 5 Volt
    Frequency Min150 kHz 50 kHz 260 kHz Undefined kHz 150 kHz 150 kHz
    Frequency Max150 kHz 1000 kHz 260 kHz 1000 kHz 150 kHz 150 kHz
    Efficiency (peak)80, 78, 81 % 95 % 90, 94, 86 % 86 % 90, 78, 82 % 90, 78, 82 %
    On/Off PinYes Yes Yes Yes Yes Yes
    PowerGood / Error FlagNo No No No No Yes
    SoftStartYes Yes No Yes No Yes
    Sync PinNo No No No No No
    InvertingNo Yes No Yes Yes
    FlybackNo No No No No No
    RegTypeSwitching 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
    Temperature Max125 deg C 125 deg C 125 deg C 125 deg C 125 deg C 125 deg C
    Adjustable OutputNo, Yes Yes Yes, No Yes Yes, No Yes, No
    Adj Switch FrequencyNo Yes No Yes No No
    PWM ModeVoltage Constant on-time Voltage with Vin Feedforward Constant On-time Voltage Voltage
    TopologyBuck Buck Buck Synchronous Buck Buck Buck
    Special FeaturesTotally integrated switching power supply, no external components Ultra-fast transient response Internal Type 3 compensation, 1.5% output voltage accuracy, SIMPLE SWITCHER regulator Vin feed forward and Current Injection compensation, SIMPLE SWITCHER synchronous regulator SIMPLE SWITCHER regulator SIMPLE SWITCHER regulator, error output delay
    Step-DownNo, Yes Yes Yes Yes Yes Yes
    Multiple Output CapabilityNo No No No No No
    Output PowerUndefined Watt Undefined Watt Undefined Watt Undefined Watt Undefined Watt Undefined Watt
    Output VoltageUndefined, 3.3, 12, 5 Volt Undefined Volt 3.3, 12, Undefined, 5 Volt Undefined Volt 3.3, Undefined, 12, 5 Volt 3.3, Undefined, 12, 5 Volt
    Output Range12V, 3.3V, 1.23V to 8V, 5V, 7V to 15V 2.5V to 37V 12V, 1.23V to 37V, 3.3V, 5V 0.8V to 7V 5V, 12V, 1.23V to 37V, 3.3V 5V, 12V, 1.23V to 37V, 3.3V
    Switching Frequency150 kHz 1000 kHz 260 kHz 1000 kHz 150 kHz 150 kHz
    Feedback VoltageUndefined Volt 2.5 Volt Undefined Volt
    Regulator FamilyUndefined Undefined SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER
    Synchronous RectificationNo No No Yes No No

    Datasheets
    TitleSizeDateOther
    Language
    LM2825 Integrated Power Supply 1A DC-DC Converter633
    Kbytes    		23-May-97日本語  


    Application Notes
    TitleSizeDateOther
    Language
    AN-1038: Application Note 1038 LM2825 Application Information Guide332
    Kbytes    		20-Sep-02日本語


    Other Technical Documents
    TitleTypeDate
    Sensing and Monitoring for Control and Protection SeminarApp Note 2003-02-17

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2825HN-ADJ/NOPB

    LM2825HN-ADJ

    RoHS Status

    MDIP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide198
    DIGI-KEYWorldwide28
    MOUSERWorldwide24
    RS COMPONENTSWorldwide6
    		$22.30 each at 1K+ pcsrail
    of
    12
    LM2825N-12/NOPB

    LM2825N-12

    RoHS Status

    MDIP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide81
    DIGI-KEYWorldwide84
    FARNELLEurope and Asia55
    MOUSERWorldwide24
    RS COMPONENTSWorldwide6
    		$22.30 each at 1K+ pcsrail
    of
    12
    LM2825N-3.3/NOPB

    LM2825N-3.3

    RoHS Status

    MDIP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide19
    DIGI-KEYWorldwide0
    		$22.30 each at 1K+ pcsrail
    of
    12
    LM2825N-5.0/NOPB

    LM2825N-5.0

    RoHS Status

    MDIP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide627
    AVNET-EMWorldwide6
    DIGI-KEYWorldwide125
    MOUSERWorldwide23
    NEWARKAmericas3
    RS COMPONENTSWorldwide17
    TAYLORAmericas159
    		$22.30 each at 1K+ pcsrail
    of
    12
    LM2825N-ADJ/NOPB

    LM2825N-ADJ

    RoHS Status

    MDIP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide22
    DIGI-KEYWorldwide0
    FARNELLEurope and Asia10
    MOUSERWorldwide24
    RS COMPONENTSWorldwide8
    		$22.30 each at 1K+ pcsrail
    of
    12

    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 LM2825.

    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 LM2825 is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LM2825HN-ADJ/NOPB

    LM2825HN-ADJ
    		6092.89
    6100
    		MDIP241
    1    		NA
    NA    		DetailDownloadN/A
    		@SIMPLE SWITCHERTM
    ZXXYYTT
    LM2825HN-ADJ
    ADJ, 1A OUTPUT
    LM2825N-12/NOPB

    LM2825N-12
    		6092.89
    6100
    		MDIP241
    1    		NA
    NA    		DetailDownloadN/A
    		@SIMPLE SWITCHERTM
    ZXXYYTT
    LM2825N-12
    12V, 1A OUTPUT
    LM2825N-3.3/NOPB

    LM2825N-3.3
    		6092.89
    6100
    		MDIP241
    1    		NA
    NA    		DetailDownloadN/A
    		@SIMPLE SWITCHERTM
    ZXXYYTT
    LM2825N-3.3
    3.3V, 1A OUTPUT
    LM2825N-5.0/NOPB

    LM2825N-5.0
    		6092.89
    6100
    		MDIP241
    1    		NA
    NA    		DetailDownloadN/A
    		@SIMPLE SWITCHERTM
    ZXXYYTT
    LM2825N-5.0
    5.0V, 1A OUTPUT
    LM2825N-ADJ/NOPB

    LM2825N-ADJ
    		6092.89
    6100
    		MDIP241
    1    		NA
    NA    		DetailDownloadN/A
    		@SIMPLE SWITCHERTM
    ZXXYYTT
    LM2825N-ADJ
    ADJ, 1A OUTPUT

    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 LM2825.

    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 LM2825 is located at RoHS Status.

    CAD Symbols and Models
    Download LM2825 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM2825HN-ADJLB30003437100416450011181688246
    LM2825N-12LB30003437100416450011181688246
    LM2825N-3.3LB30003437100416450011181688246
    LM2825N-5.0LB30003437100416450011181688246
    LM2825N-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 LM2825.

    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 LM2825 is located at RoHS Status.

    [Information as of 6-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation