1. Products
  2. Power Monitor, Control, and Protection
  3. Hot Swap Controllers
  4. FireWire (IEEE 1394) Controllers
  5. MAX5944


Features and Benefits

  • Provides Safe Hot-Swap for 7.5V to 37V Power Supplies
  • Dual-Channel Hot-Swap
  • Low-Drop Power ORing with Ultra-Fast Turn-Off
  • Active Current Limit
  • ±5% Current-Limit Sensing Accuracy
  • 2ms Current-Limit Timeout
  • Fast Current-Limit Response to Output Short-Circuit Conditions
  • Drives External n-Channel Power MOSFETs
  • Independent Overcurrent Fault Status Outputs
  • 259ms Autoretry Period
  • 10µA (Per Channel) Shutdown Current
  • Independent ON/OFF Control Allows Undervoltage Lockout Programming
  • Fast Load Disconnect Control Through ON/OFF Inputs
  • Bidirectional Load Disconnect
  • Power Routing from One Port to Another

Product Details

The MAX5944 is a dual, current limiter/low-drop ORing, switch controller power-management IC for FireWire® applications. Each independent channel controls two external power MOSFETs to regulate current from the input power supply to the load and performs low-voltagedrop power-supply ORing. The MAX5944 operates over the 7.5V to 37V input range and provides inrush and output current limit in addition to diode ORing functions suitable for FireWire applications.

The MAX5944 allows the safe insertion and removal of FireWire peripherals into a live FireWire port by providing inrush current control and output current-limiting functions. The MAX5944 features a current-limit function that actively limits the current drawn by the load with a 2ms timeout. Its autoretry function then automatically restarts after the 259ms autoretry delay time.

The ORing feature provides a very efficient way to protect the FireWire port when connected to another FireWire peripheral that sources a higher voltage. By turning off the external MOSFETS, the MAX5944 provides a true bidirectional load disconnect. Each channel has an independent ON/OFF control that results in less than 10µA supply current per channel.

The MAX5944 operates over the -40°C to +125°C extended temperature range and is available in a 16-pin SO package.


  • FireWire® Desktop/Notebook Port
  • FireWire® Hub
  • FireWire® Peripheral Device Current Limit
  • Hot Swap

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Product Recommendations

MAX5944 Companion Parts

Recommended Related Parts

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
MAX5944ESE+ Material Declaration Reliability Data 16-SOIC_N-150_MIL
MAX5944ESE+T Material Declaration Reliability Data 16-SOIC_N-150_MIL
Wafer Fabrication Data MAX5944 Reliability Data

Sample & Buy

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