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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
          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
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