General Description

The MAX5963 dual hot-swap and diode ORing controller provides complete protection for dual-supply high availability systems. The device operates from 7.5V to 76V and provides hot-swap and low voltage-drop diode ORing functionality for two 7.5V to 76V outputs.

The MAX5963 allows for the safe insertion and removal of system line cards and FireWire® peripherals into a live backplane by providing inrush current control and active current limiting. The device controls external  n-channel power MOSFETs to perform low-voltage-drop ORing, inrush current control, and current limiting functions. The current-limit function actively limits the current drawn by the load, protecting the load from a short-circuit condition. The MAX5963 also features a circuit-breaker function that disconnects the power to the load if the load current exceeds the circuit-breaker limit for a programmable circuit-breaker timeout.

Features

♦ Hot Swaps Two 7.5V to 76V Supplies

♦ Integrates Low-Voltage-Drop ORing Controller

♦ ±5 Accuracy Bilevel Active Current Limit/Circuit

   Breaker

♦ Programmable Current-Limit/Circuit-Breaker

   Timeout

♦ 10µA Power-Off Mode Current

♦ Protects Up to Two FireWire Ports

♦ System Power-On/Off ORing

♦ Latchoff or Autoretry Power Management

♦ Independent ON/OFF Control Allows

   Undervoltage Lockout Programming

♦ Fast Load Disconnect through FOSO Input

   (FireWire Port)

Applications

   Blade Servers

   Base-Station Line Cards

   Network Switches/Routers

   FireWire Desktops/Notebook Ports

   FireWire Hubs