The LT4256-2IS8#PBF is a positive high voltage Hot Swap Controller that allows 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 10.8 to 80V. It features an adjustable analog fold back 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 PWRGD output indicates when the output voltage rises above a programmed level. An external resistor string from VCC provides programmable undervoltage protection.
Allows safe board insertion and removal from a live backplane
(EN)
