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                快速發布采購 管理采購信息

                LT3840 PDF Datasheet瀏覽和下你還是自己給我下去吧載

                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
                n
                n
                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
                n
                n
                n
                n
                n
                n
                n
                n
                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
                n
                n
                n
                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
                1