LT4254IGN#PBF

LT4254 is a high voltage Hot Swap™ controller. It 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 36V. It features an open-circuit detect (OPEN) output that indicates abnormally low load current conditions. It features an adjustable analogue 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 goes low and the device either automatically restarts after a time-out delay or latches off until the UV pin is cycled low. The RETRY pin sets whether the part will automatically restart after an overcurrent fault or if it will latch off until the UV pin is cycled low. It is used in application like hot board insertion, electronic circuit breaker/power bussing, industrial high side switch/circuit breaker, 24V industrial/alarm systems, 12V and 24V distributed power system.

• 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
• Undervoltage and overvoltage protection
• Open MOSFET detection
• Operating current is 1.9mA typical at (TA = 25°C, VCC = 24V)
• Undervoltage threshold is 4V typical at (VCC low-to-high transition, TA = 25°C, VCC = 24V)
• Operating temperature is -40°C to 85°C
• Package style is 16-lead plastic TSSOP

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