LT4256-2 - Positive High Voltage Hot Swap Controllers

Supplied by
  1. Analog Devices Ltd

    LT4256-2 - Positive High Voltage Hot Swap Controllers
    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. See Table 1 on page 14 for upgraded specifications. The LT4256-1 and LT4256-2 are available in an 8-pin SO package that is pin compatible with the LT1641.