GENERAL DESCRIPTION
The ADM1075 is a full feature, negative voltage, hot swap controller with constant power foldback and high accuracy digital current and voltage measurement 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 and overvoltage and undervoltage conditions. The ADM1075 typically operates from a negative voltage of −35 V to −80 V and, due to shunt regulation, has excellent voltage transient immunity. The operating range of the part is flexible due to the shunt regulator, and the part can be powered directly by a 10 V rail to save shunt power dissipation (see the Powering the ADM1075 section for more details).

FEATURES
   Constant power foldback for FET SOA protection
   Precision (<1.0%) current and voltage measurement
   Controls inrush and faults for negative supply voltages
   Suitable for wide input range due to internal shunt regulator
   25 mV/50 mV full-scale sense voltage
   Fine tune current limit to allow use of standard sense resistor
   Soft start inrush current limit profiling
   1% accurate UVH and OV pins, 1.5% accurate UVL pin
   PMBus/I2C interface for control, telemetry, and fault
      recording
   28-lead LFCSP and TSSOP
   −40°C to 105°C junction temperature (TJ) operating range

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