LT4256-3IGN#PBF

LT4256-3 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. 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 asserts low and the device 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). It is used in applications such as hot board insertion, electronic circuit breaker/power bussing, industrial high side switch/circuit breaker, 24V/48V industrial/alarm systems, ideally Suited for 12V, 24V and 48V distributed power systems, 48V telecom systems etc.

• Open circuit and overcurrent fault detect
• Automatic retry or latched off operation after overcurrent fault
• Programmable supply voltage power-up rate
• Open MOSFET detection
• 1% over and undervoltage detection accuracy
• Operating current is 1.8mA typical at ( TA = 25°C, VCC = 48V)
• Undervoltage threshold is 4V typical at ( VCC low-to-high transition, TA = 25°C, VCC = 48V)
• Operating temperature is -40°C to 85°C
• Package style is 16-lead plastic SSOP

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