The LT4256-1/LT4256-2 are high voltage Hot Swap™ controllers that allow a board to be safely inserted and removed from a live backplane. An internal driver drives an external N-channel MOSFET switch to control supply voltages ranging from 10.8V to 80V. The LT4256-1/LT4256-2 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 and the PWRGD output asserts low. The LT4256-2 automatically restarts after a time-out delay. The LT4256-1 latches off until the UV pin is cycled low. The PWRGD output indicates when the output voltage rises above a programmed level. An external resistor string from VCC provides programmable undervoltage protection. The LT4256 can be used as an upgrade to LT1641 designs. The LT4256-1 and LT4256-2 are available in an 8-pin SO package that is pin compatible with the LT1641. 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 * Overcurrent Fault Detection * Drives an External N-Channel MOSFET https://elecena.pl/product/14873252/positive-high-voltage-hot-swap-controllers 2018-05-22 https://elecena.pl/product/14873252/positive-high-voltage-hot-swap-controllers 2025-01-17