MAX5963

Dual, 7.5V to 76V, Hot-Swap and Diode ORing Controller

Industry's First 7.5V to 76V, Hot-Swap and Diode ORing Controller

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Overview

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)

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.

The MAX5963 features an autoretry/latchoff input. In autoretry mode, the MAX5963 automatically restarts the turned-off channel after a programmable delay. In latchoff mode, the MAX5963 latches the channel off.

The MAX5963 consumes less than 10µA from the PWR supply in system power-off mode.

The MAX5963 is available in a 40-pin TQFN package (6mm x 6mm) and operates over the 0°C to +85°C upper commercial temperature range.

Applications