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        LT3840 PDF Datasheet瀏覽和下載

        型號:
        LT3840
        PDF下載:
        下載PDF文件 在線瀏覽文檔
        內容描述:
        [60V DC-DC]
        文件大小:
        285 K
        文件頁數:
        24 Pages
        品牌Logo:
        品牌名稱:
        LINER [ LINEAR TECHNOLOGY ]



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        FeaTures
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        LT3840
        Wide Input Range
        Synchronous Regulator Controller
        with Accurate Current Limit
        DescripTion
        The
        is a high voltage synchronous step-down
        switching regulator controller capable of operating from
        a 2.5V to 60V supply.
        The LT3840’s low quiescent current, when configured for
        user selectable Burst Mode operation, helps extend run
        time in battery-powered systems by increasing efficiency
        at light loads. The LT3840 uses a constant frequency,
        current mode architecture. High current applications are
        possible with large N-channel gate drivers capable of
        driving multiple low R
        DS(ON)
        MOSFETs.
        An integrated buck-boost switching regulator generates
        a 7.5V bias supply voltage for MOSFET gate drive and IC
        power allowing higher efficiency operation over the entire
        input voltage range and eliminating the need for an external
        bias voltage. An accurate current limit set point regulates
        the maximum output current. A current monitor reports
        the average output current.
        L,
        LT, LTC, LTM, Linear Technology, Burst Mode, and the Linear logo are registered
        trademarks of Linear Technology Corporation. All other trademarks are the property of their
        respective owners.
        n
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        n
        n
        n
        n
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        n
        Wide Input Range: 2.5V to 60V
        Integrated Buck-Boost Supply for 7.5V MOSFET
        Gate Drive
        Programmable Constant-Current Operation with
        Current Monitor Output
        Low I
        Q
        : 75μA, 12V
        IN
        to 3.3V
        OUT
        Selectable Low Output Ripple Burst Mode
        ?
        Operation
        V
        OUT
        Up to 60V
        Adjustable and Synchronizable: 50kHz to 1MHz
        Internal OVLO Protects for Input Transients Up to 80V
        Accurate Input Overvoltage and Undervoltage Threshold
        Programmable Soft-Start with Voltage Tracking
        Power Good and Output OVP
        28-Lead TSSOP and 38-Lead 4mm × 6mm QFN Packages
        applicaTions
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        Automotive Supplies
        Industrial Systems
        Distributed DC Power Systems
        Typical applicaTion
        High Efficiency Synchronous Step-Down Converter
        V
        IN
        4V TO 60V
        68μF
        ×2
        1μF
        33μH
        100
        95
        AUXBST AUXSW1
        EN
        V
        IN
        AUXVIN
        UVLO
        OVLO
        PG
        SYNC
        MODE
        RT
        V
        C
        49.9k
        20k
        1500pF
        100pF
        IMON
        ICOMP
        7.68k
        470pF
        3840 TA01a
        12V
        IN
        to 3.3V
        OUT
        Efficiency
        AUXSW2
        INTV
        CC
        90
        EFFICIENCY (%)
        1.5μH
        2m
        V
        OUT
        3.3V
        20A
        330μF
        ×2
        4.7μF
        85
        80
        75
        70
        65
        60
        55
        50
        0
        5
        10
        15
        LOAD CURRENT (A)
        20
        3840 TA01b
        LT3840
        BOOST
        1μF
        TG
        SW
        BG
        SENSE
        +
        SENSE
        FB
        GND
        ICTRL
        16.9k
        10k
        TK/SS
        2200pF
        3840fa
        For more information
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