The ADM1075-2ACPZ is a full feature, negative voltage, hot swap controllerwith constant power foldback and high accuracy digital currentand voltage measurement that allows boards to be safely insertedand removed from a live -48 V backplane. The part providesprecise and robust current limiting and protection against bothtransient and nontransient short circuits and overvoltage andundervoltage conditions. The ADM1075-2ACPZ typically operates froma negative voltage of -35 V to -80 V and, due to shunt regulation,has excellent voltage transient immunity. The operating range ofthe part is flexible due to the shunt regulator, and the part can bepowered directly by a 10 V rail to save shunt power dissipation(see the Powering the ADM1075-2ACPZ section for more details).
A full-scale current limit of 25 mV or 50 mV can be selected bychoosing the appropriate model. The maximum current limit isset by the combination of the sense resistor, RSENSE, and the inputvoltage on the ISET pin, using external resistors. This allows finetuning of the trip voltage so that standard sense resistors can beused. Inrush current is limited to this programmable value bycontrolling the gate drive of an external N-channel FET. A builtinsoft start function allows control of the inrush current profile byan external capacitor on the soft start (SS) pin.
Refer to the datasheet for more information.
PRODUCT HIGHLIGHTS
Feature
- 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 interface for control, telemetry, and fault recording
- 28-lead 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
(Picture: Pinout)
