GENERAL DESCRIPTION
The ADM1073 is a full-feature, negative voltage, hot swap controller that allows boards to be safely inserted and removed from a live −48 V backplane. The part provides precise and robust current limiting, and protection against both transient and nontransient short circuits in overvoltage and undervoltage conditions. The ADM1073 can operate from a negative voltage of −18 V to −80 V and can tolerate transient voltages of up to −200 V.

FEATURES
   Precision inrush linear current limit
   Soft start inrush current limit profiling
   Precision maximum on-time in current limit
   Maximum on-time modulated by FET drain voltage for
      additional SOA protection
   Adjustable PWM retry scheme and multiple device cascading
      capability for charging large capacitive loads
   Limited number of PWM cycles for FET SOA protection under
      short circuit condition
   Ability to configure device as continuous autoretry with a
      5-second cooling period
   Shunt regulator topology to allow very large transient input
      supplies
   Separate UV and OV pins for programming allowable input
      supply window
   Programmable OV hysteresis using current source into pin
      when supply is high
   Programmable UV hysteresis using current sink from pin
      when supply is low
   PWRGD output indicates when capacitor charging complete
   SPLYGD output indicates when supply is within
      valid window
   LATCHED output indicates the end of the retry cycle before
      load capacitance is charged
   SHDN input for user-commanded shutdown
   RESTART input for user-triggered 5-second shutdown and
      autorestart— virtual card reseat

APPLICATIONS
   Central office switching
   Telecommunication and data communication equipment
   −48 V distributed power systems
   Negative power supply control
   High availability servers
   −48 V power supply modules
   Disk arrays