Description

The ADM1073ARU is a full-feature, negative voltage, hot swap controller designed for safely inserting and removing boards from a live −48 V backplane. It offers precise and robust current limiting, along with protection against transient and nontransient short circuits in overvoltage and undervoltage conditions. With an operating voltage range from -18 V to -80 V and the ability to tolerate transient voltages of up to -200 V, this hot swap controller provides reliable and efficient performance for a variety of applications.

Specifications and 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

Application Scenarios

- 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

Comparison

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