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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
                      开奖结果