2.7V to 18V, 9A, Integrated Hot-Swap Solution with Current Report Output

The MAX15091/MAX15091A ICs are integrated solutions for hot-swap applications requiring the safe insertion and removal of circuit line cards from a live backplane. The devices integrate a hot-swap controller, 18mΩ (typ) power MOSFET, and an electronic circuit-breaker protection in a single package.

The devices integrate an accurate current-sense circuitry and provide 170µA/A of proportional output current. The devices are designed for protection of 2.7V to 18V supply voltages.

These devices implement a foldback current limit during startup to control inrush current lowering di/dt and keep the MOSFET operating under safe operating area (SOA) conditions. After the startup cycle is complete, on-chip comparators provide VariableSpeed/BiLevel™ protection against short-circuit and overcurrent faults, and immunity against system noise and load transients. The load is disconnected in the event of a fault condition. The devices are factory calibrated to deliver accurate overcurrent protection with ±10% accuracy. During a fault condition, the MAX15091 latches off, while the MAX15091A enters autoretry mode.

The devices feature an IN to OUT short-circuit detection before startup. The devices provide a power-MOSFET GATE pin to program the slew rate during startup by adding an external capacitor. The devices have overvoltage/undervoltage input pins that can detect an overvoltage/undervoltage fault and disconnect the IN from the OUT. Additional features include internal overtemperature protection, power-good output, and fault-indicator output.

The MAX15091/MAX15091A are available in a 28-pin, 5mm × 5mm TQFN power package and are rated over the -40°C to +85°C extended temperature range.

Applications

* Blade Servers * Disk Drive Power * Industrial Applications * RAID Systems * Server I/O Cards * Storage Applications

* Integration Reduces Solution Size for Blade Servers and Other Space-Constrained Designs

* Integrated 18mΩ (typ) Internal Power MOSFET

* Overvoltage Protection

* Power-Good and Fault Outputs

* Analog Current Reporting Without Need for External RSENSE

* Thermal Protection

* Flexibility Enables Use in Many Unique Designs

* 2.7V to 18V Operating Voltage Range

* Programmable Inrush Current Control Under SOA Operation

* Adjustable Circuit-Breaker Current/Current-Limit Threshold

* Programmable Slew-Rate Control

* Programmable Undervoltage Lockout

* Variable-Speed Circuit-Breaker Response

* Latchoff or Automatic Retry Options

* Safety Features Ensure Accurate, Robust Protection

* 9A (max) Load Current Capability

* ±10% Circuit-Breaker Threshold Accuracy

* Inrush Current Regulated at Startup with Foldback

* Implementation for di/dt Control

* IN-to-OUT Short-Circuit Detection