LT4256-3IGN#PBF

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1. DESCRIPTION

The LT4256-3IGN#PBF is a high voltage Hot SwapTM 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 LT4256-3IGN#PBF 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 LT4256-3IGN#PBF 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 LT4256-3IGN#PBF is available in a 16-lead SSOP package.

2. FEATURES

    1. Allows Safe Board Insertion and Removal from a Live Backplane

    2. Controls Supply Voltage from 10.8V to 80V

    3. Foldback Current Limiting

    4. Open Circuit and Overcurrent Fault Detect

    5. Drives an External N-Channel MOSFET

    6. Automatic Retry or Latched Off Operation After Overcurrent Fault

    7. Programmable Supply Voltage Power-Up Rate

    8. Open MOSFET Detection

    9. 1% Over and Undervoltage Detection Accuracy

  10. Available in a 16-Lead SSOP Package

3. APPLICATIONS

    1. Hot Board Insertion

    2. Electronic Circuit Breaker/Power Bussing

    3. Industrial High Side Switch/Circuit Breaker

    4. 24V/48V Industrial/Alarm Systems

    5. Ideally Suited for 12V, 24V and 48V Distributed Power Systems

    6. 48V Telecom Systems