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                                快速發布采購 管理采購信息

                                LT3840 PDF Datasheet瀏覽和下載

                                型號.:
                                LT3840
                                PDF下載:
                                下載PDF文件
                                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.
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                                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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