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