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The LT®4256-3 is a high voltage Hot Swap™ controller that allows a board to be safely inserted and removed from a live backplane. An internal driver controls the high side N-channel MOSFET gate for supply voltages ranging from 10.8V to 80V. The part features an open-circuit detect (OPEN) output that indicates abnormally low load current conditions.

The LT4256-3 also features an adjustable analog foldback current limit. If the supply remains in current limit for more than a programmable time, the N-channel MOSFET shuts off, the PWRGD output asserts low and the LT4256-3 either automatically restarts after a time-out delay or latches off until the UV pin is cycled low (depending on the status of the RETRY pin).

The PWRGD output indicates when the output voltage rises above a programmed level. An external resistor string from VCC provides programmable undervoltage and overvoltage protection.

The LT4256-3 is available in a 16-lead SSOP package.

优势 特点
  • Allows Safe Board Insertion and Removal from a Live Backplane
  • Controls Supply Voltage from 10.8V to 80V
  • Foldback Current Limiting
  • Open Circuit and Overcurrent Fault Detect
  • Drives an External N-Channel MOSFET
  • Automatic Retry or Latched Off Operation After Overcurrent Fault
  • Programmable Supply Voltage Power-Up Rate
  • Open MOSFET Detection
型号选项
产品型号
LT4256-1CS8
LT4256-1CS8#PBF
LT4256-1CS8#TR
LT4256-1CS8#TRPBF
LT4256-1IS8
封装
SO 8
SO 8
SO 8
SO 8
SO 8
温度范围
C
C
C
C
I
库存
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