The 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. 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. Retry / Latch Off Features Package LT4256-1 Latch Off UV SO-8 LT4256-2 Retry UV SO-8 LT4256-3 Latch Off or Retry UV/OV, Open Circuit Detect SSOP-16 Applications * 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 * 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 https://elecena.pl/product/247519/positive-high-voltage-hot-swap-controller-with-open-circuit-detect 2007-03-01 https://elecena.pl/product/247519/positive-high-voltage-hot-swap-controller-with-open-circuit-detect 2017-10-28 https://elecena.pl/product/247519/positive-high-voltage-hot-swap-controller-with-open-circuit-detect 2025-01-21