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                          LT3840 PDF Datasheet浏览和下载

                          型号:
                          LT3840
                          PDF下载:
                          下载PDF文件 在线浏览文档
                          内容描述:
                          [60V DC-DC]
                          文件大?。?/dt>
                          285 K
                          文件页数:
                          24 Pages
                          品牌Logo:
                          品牌名称:
                          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
                          和值跨度速查表