datasheet lm2576t

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  • 7/29/2019 datasheet LM2576T

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    1 www.semtech.com

    LM2575 & LM2576

    1A & 3A MiniconverterSwitching Regulators

    POWER MANAGEMENT

    Revision 1, January 2001

    u Pin for pin replacement for Nationals LM2575/6

    series

    uDC-to-DC buck or buck/boost converter requiringonly 4 support components

    u Fixed or adjustable voltages

    u Preset output voltages of 3.3V, 5V and 12V

    u Wide output voltage range, 1.23V to 35V

    u 82% typical efficiency @ 5V out

    u Wide input voltage range, 4V to 40V

    u Inhibit/enable control pin

    u Industrial temperature range

    u TO-220 and TO-263 packages

    The LM2575/6 series switching regulators are monolithic

    integrated circuits designed for use in buck or buck/

    boost regulator applications requiring accurate output

    voltages over combined variations of line, load and

    temperature. This unique series greatly simplifies

    switching power supply design. The LM2575 has a

    maximum output current of 1A and the LM2576 is rated

    for 3A.

    The LM2575/6 series miniconverters include a

    switching regulator and compensation network all within

    the same package. Just add a choke, catch diode and

    two capacitors to obtain an efficient DC-to-DC converter.

    The current limit and thermal shutdown features of the

    LM2575/6 series fully protect the device againstoverstress conditions.

    The LM2575/6 series offers an alternative to popular 3

    terminal linear regulators by providing higher efficiency

    with reduced heatsink size. In many applications a heat

    sink will not be required.

    u Micro controller power supplies

    u Medical equipment

    u Industrial power supplies

    u Instrumentation power supplies

    Description Features

    Applications

    Typical Application Circuits

    5752ML 6752ML

    L1

    H033 H001

    D1

    A3 A7

    C NI F86 F021

    CTUO

    F033 F000,1

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    LM2575 & LM2576

    POWER MANAGEMENT

    retemaraP lobmyS mumixaM stinU

    egatloVtupnI VNI

    54 V

    egatloVtupnIniPffO/nO V FFO/NO 3.0- V FFO/NO VNI V

    )etatSydaetS(nommoCotegatloVtuptuO 1- V

    noitapissiDrewoP PD

    detimiLyllanretnI W

    tneibmAotnoitcnuJecnatsiseRlamrehT

    022-OT

    362-OTq

    AJ55

    06

    W/C

    esaCotnoitcnuJecnatsiseRlamrehT

    022-OT

    362-OTq

    CJ0.2

    0.2

    W/C

    egnaRerutarepmeTnoitcnuJgnitarepO TJ 521+ot04- C

    egnaRerutarepmeTegarotS TGTS

    051+ot56- C

    .ceS01)gniredloS(erutarepmeTdaeL TDAEL

    003 C

    )ledoMydoBnamuH(gnitaRDSE VDSE

    2 Vk

    retemaraP lobmyS snoitidnoCtseT niM pyT xaM stinU

    egatloVtuptuO VO IO A5.0= 32.3 03.3 73.3 V

    3.3-6752ML VotV8NI

    detaR 02.3 04.3

    41.3 74.3

    egatloVtuptuO VO

    IO

    A5.0= 09.4 00.5 01.5 V

    5-6752ML VotV8NI

    detaR 58.4 51.5

    57.4 52.5

    egatloVtuptuO VO

    IO

    A5.0= 67.11 00.21 42.21 V

    21-6752ML VotV51 NI detaR 25.11 84.21

    04.11 06.21

    egatloVkcabdeeF VBF

    IO

    A5.0= 712.1 032.1 342.1 V

    V,JDA-6752MLO

    V5= VotV8NI

    detaR 391.1 762.1

    081.1 082.1

    tnerruCsaiBkcabdeeF IB

    VNI

    I,V21=O

    A5.0= 05 001 An

    JDA-6752ML 005

    Unless otherwise specified: VIN

    = 12V for 3.3V, 5V and ADJ options and 25V for 12V option; VOUT

    = 5V for ADJ option; TA

    = 25C; VIN

    rated = 40V;

    IO

    = 0.5 to 3A (LM2576), 0.2 to 1A (LM2575). Values in bold apply over full operating temperature range.

    Absolute Maximum Ratings

    Electrical Characteristics

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    LM2575 & LM2576

    POWER MANAGEMENT

    Electrical Characteristics (Cont.)

    retemaraP lobmyS snoitidnoCtseT niM pyT xaM stinU

    egatloVtuptuO VO IO A2.0= 32.3 03.3 73.3 V

    3.3-5752ML VotV8NI

    detaR 02.3 04.3

    41.3 74.3

    egatloVtuptuO VO

    IO

    A2.0= 09.4 00.5 01.5 V

    5-5752ML VotV8NI

    detaR 58.4 51.5

    57.4 52.5

    egatloVtuptuO VO

    IO

    A2.0= 67.11 00.21 42.21 V

    21-5752ML VotV51 NI detaR 25.11 84.21

    04.11 06.21

    egatloVkcabdeeF VBF

    IO

    A2.0= 712.1 032.1 342.1 V

    V,JDA-5752MLO

    V5= VotV8NI

    detaR 391.1 762.1

    081.1 082.1

    tnerruCsaiBkcabdeeF IB

    VNI

    I,V21=O

    A2.0= 05 001 An

    JDA-5752ML 005

    noitpO/ycneiciffE

    V3.3 h VNI I,V21= O )6752MLrofA3,5752ML(A1= 77 %

    V5 28

    V21 VNI

    I,V51=O

    )6752MLrofA3,5752ML(A1= 88

    V,JDAO

    V5= VNI

    I,V21=O

    )6752MLrofA3,5752ML(A1= 28

    ycneuqerFgnihctiwS fXS

    74 25 85 zHk

    34 26

    egatloVnoitarutaS )1( VTAS

    I,5752MLO

    A1= 9.0 2.1 V

    I,6752MLO

    A3= 9.0 4.1

    )nO(elcyCytuD.xaM )3( CD 39 89 %

    5752MLtnerruCkaeP )1( ILC

    7.1 2.2 0.3 A

    3.1 2.3

    6752MLtnerruCkaeP )1( ILC

    2.4 8.5 9.6 A

    5.3 5.7

    Unless otherwise specified: VIN

    = 12V for 3.3V, 5V and ADJ options and 25V for 12V option; VOUT

    = 5V for ADJ option; TA

    = 25C; VIN

    rated = 40V;

    IO

    = 0.5 to 3A (LM2576), 0.2 to 1A (LM2575). Values in bold apply over full operating temperature range.

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    LM2575 & LM2576

    POWER MANAGEMENT

    Notes:

    (1) Output sourcing current, resistive load, no inductor or capacitor.

    (2) Feedback = VO

    + 1.0V.

    (3) Feedback = 0V.

    Electrical Characteristics (Cont.)

    retemaraP lobmyS snoitidnoCtseT niM pyT xaM stinU

    tnerruCegakaeLtuptuO )2(

    V0=tuptuO IL

    VNI

    V=NI

    detaR 2 Am

    V1-=tuptuO 5.7 03

    tnerruCtnecseiuQ )2( IQ

    5 01 Am

    21

    tnerruCtnecseiuQybdnatS IYBTS

    05 A

    )V5=niPffO/nO( 005

    leveLtupnIcigoLniPffO/nO VHI 2.2 4.1 V4.2

    VLI

    2.1 0.1 V

    8.0

    tnerruCtupnIniPffO/nO IHI

    VFFO/NO

    )ffO(V5= 21 03 A

    ILI

    VFFO/NO

    )nO(V0= 0 01

    Unless otherwise specified: VIN

    = 12V for 3.3V, 5V and ADJ options and 25V for 12V option; VOUT

    = 5V for ADJ option; TA

    = 25C; VIN

    rated = 40V;

    IO

    = 0.5 to 3A (LM2576), 0.2 to 1A (LM2575). Values in bold apply over full operating temperature range.

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    LM2575 & LM2576

    POWER MANAGEMENT

    TO-220-5

    TO-263-5

    eciveD )1( egakcaP tnerruC

    XX-T5752ML 5-022-OT )3()2( A1

    RT.XX-S5752ML 5-362-OT )4(

    XX-T6752ML 5-022-OT )3()2( A3

    RT.XX-S6752ML 5-362-OT )4(

    Notes:

    (1) -XX = Voltage Option. Available voltages are 3.3V

    (-3.3), 5V (-5.0), 12V (-12), and ADJ (-ADJ), which is

    adjustable between 1.23V and 35V.

    (2) Lead bend options for TO-220-5 are: T-XX = Straight

    in-line; T-XX-V = Vertical Staggered; T-XX-H = Horizonta

    Staggered. Please refer to outline drawings at the end of

    this datasheet.

    (3) Only available in tube packaging. A tube contains 50

    devices.

    (4) Only available in tape and reel packaging. A ree

    contains 800 devices.

    6752ML,5752ML

    niP noitcnuF

    1 VNI

    2 TUPTUO

    3 NOMMOC

    4 KCABDEEF

    5 FFO/NO

    NOMMOCsiBAT

    Pin Configurations Ordering Information

    Block Diagram

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    LM2575 & LM2576

    POWER MANAGEMENT

    Typical Characteristics - LM2575

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    LM2575 & LM2576

    POWER MANAGEMENT

    Typical Characteristics - LM2575 (Cont.)

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    LM2575 & LM2576

    POWER MANAGEMENT

    Typical Characteristics - LM2575 (Cont.)

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    LM2575 & LM2576

    POWER MANAGEMENT

    Typical Characteristics - LM2576

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    LM2575 & LM2576

    POWER MANAGEMENT

    Typical Characteristics - LM2576 (Cont.)

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    LM2575 & LM2576

    POWER MANAGEMENT

    Typical Characteristics - LM2576 (Cont.)

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    LM2575 & LM2576

    POWER MANAGEMENT

    The above component selections will be adequate for

    most applications for output currents from 250mA to 3A(LM2576) or 150mA to 1A (LM2575). Applications with

    VOUT

    below 5V or above 24V may require component

    adjustment for maximum performance; please contact

    factory for application assistance.

    1. Device Selection. Select an appropriate device from

    the Ordering Information guide based upon voltage

    option and package.

    2. Thermal Conditions.Most applications will not requirea heatsink for the TO-220 package. Approximate power

    dissipation is:

    IN

    OIN

    IN

    SATOO

    V

    VV02.0

    V

    VIVP +=

    3. Catch Diode. If the output must be capable of a

    sustained short, the IF

    rating must be above 3A for the

    LM2575 and 7A for the LM2576. The use of an ultra

    fast diode with soft recovery characteristics or a Schottky

    will be adequate. The major impact on the selection of a

    Schottky versus an ultra fast diode is efficiency. Schottkys

    will provide approximately 4% to 5% improvement foVOUTS

    below 12V, whereas above 12V the difference wil

    become less significant. Breakdown rating must be in

    excess of VIN

    for margin.

    4. Input Capacitor.The value shown will be adequate fomost applications. Ripple voltage at the switching

    frequency is caused by the input capacitor supplying load

    current during the on time of the power switch. The use

    of a low ESR switching type capacitor will minimize ripple

    to an acceptable level.

    5. Layout. Use short connections with a central point

    ground to prevent improper operation caused by stray

    inductance and ground loops.

    6. Output Capacitor. Ripple voltage on VOUT

    is directly

    related to the value of COUT

    and the internal resistance

    ESR of COUT

    . Output noise can be lowered by increasing

    COUT

    or by selecting a capacitor with a lower ESR. ESR

    must be a minimum of 0.03W for the LM2576 or 0.07W

    for the LM2575 to maintain stability, otherwise raise the

    value of COUT

    .

    Applications Information - Buck Mode

    5752ML 6752ML

    L1

    H033 H001

    D1

    A3 A7

    CNI

    F86 F021

    CTUO

    F033 F000,1

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    LM2575 & LM2576

    POWER MANAGEMENT

    7. Switching Spikes. Switching spikes will also occur due

    to distributive capacitance across turns of the inductor

    when combined with output capacitor series inductance

    (ESL). Reduction to a level at or below the switching ripple

    can be achieved by using a post filter as shown below.

    Switching Spike Reduction

    Typical Buck Shutdown

    Applications Information (Cont.)

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    LM2575 & LM2576

    POWER MANAGEMENT

    Turn-On Delay

    Under Voltage Lockout

    Turn-On Delay With Spike Filter

    Applications Information (Cont.)

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    LM2575 & LM2576

    POWER MANAGEMENT

    5752ML 6752ML

    CNI

    F74 F001

    1D A3 A7

    1L H001 H86

    CTUO

    F007,2 F008,6

    ITUO

    Am052 Am005

    5752ML 6752ML

    CNI

    F74 F001

    1D A3 A7

    1L H001 H86

    CTUO

    F074 F007,2

    I TUO Am001 Am057

    Inverting buck/boost operation is a different topology of

    operation than buck. This difference reduces the output

    current capability of the device, in that the inductor must

    supply all of the load current during the time the power

    switch is off. Maximum output current is approximately:

    )2576LM(

    V

    V12

    5.3I

    IN

    O

    OUT

    +

    )2575LM(

    V

    V12

    3.1I

    IN

    O

    OUT

    +

    Component stress requirements are very similar to the

    buck with a few exceptions:

    (1) catch diode breakdown VBR

    must be greater than

    VIN

    + |VOUT

    |

    (2) input capacitor is larger due to the increased peak

    current during switch turn on. Power dissipation isapproximately:

    IN

    OINSAT

    IN

    OO

    INO

    OD

    V

    VV02.0V

    V

    V1I

    VV

    VP +

    +

    +

    Please contact factory for additional assistance when

    using the buck/boost topology.

    Applications Information - Inverting Buck/Boost

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    LM2575 & LM2576

    POWER MANAGEMENT

    Inverting Buck/Boost Shutdown

    Applications Information (Cont.)

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    LM2575 & LM2576

    POWER MANAGEMENT

    Pre-Wound Inductors:

    Hurricane Electronics Lab

    P.O. Box 1280

    Hurricane Industrial Park

    Hurricane, UT 84737

    (801) 635-2003

    Core Source:

    Micro Metals, Inc.

    1190 N. Hawk Circle

    Anaheim, CA 92807

    (714) 630-7420

    Capacitors:

    VPR Series

    Mallory Capacitor Co.4760 Kentucky Avenue

    Indianapolis, IN 46241

    (317) 856-3731

    511D & 673 Series

    Sprague Electric Co.

    North Adams, MA

    (413) 664-4411

    HFQ, HFZ Series

    Panasonic Industrial Co.

    2 Panasonic Way

    Secaucus, NJ 07094

    (201) 392-6142

    PF, PL Series

    Nichicon Corp.

    927 E. State Pkwy.

    Schaumburg, IL 60195

    (708) 843-7600

    LXF Series

    United Chemi-con

    9801 West Higgins Road

    Rosemont, IL 60018

    (708) 696-2000

    Heat Sinks:

    AAVID Engineering Co.

    P.O.Box 400

    One Kool Path

    Laconia, NH 03247

    (603) 528-3400

    Thermalloy, Inc.

    2021 W. Valley View Lane

    Dallas, TX 76381(214) 243-4321

    Diodes - Catch:

    Ultra Fast/Soft Recovery

    Semtech Corporation

    652 Mitchell Road

    Newbury Park, CA 91320

    (805) 498-2111

    Diodes - Schottky:

    Fuji/Collmer Semiconductor

    14368 Proton Road

    Dallas, TX 76244

    (800) 527-0521

    Micro Quality

    1000 N. Shiloh

    Garland, TX 76046

    (214) 272-7811

    Support Components Information

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    LM2575 & LM2576

    POWER MANAGEMENT

    Outline Drawing - TO-220-5 (T-XX-H Option)

    Outline Drawing - TO-220-5 (T-XX Option)

    Outline Drawing - TO-220-5 (T-XX-V Option)

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    LM2575 & LM2576

    POWER MANAGEMENT

    Contact Information

    Semtech Corporation

    Power Management Products Division

    652 Mitchell Rd., Newbury Park, CA 91320

    Phone: (805)498-2111 FAX (805)498-3804

    Outline Drawing - TO-263-5

    Minimum Land Pattern - TO-263-5