Features and Benefits

  • Safely Hot Swaps 7.5V to 37V Power Supplies
  • Low-Voltage-Drop Power ORing
  • Evaluates MAX5943A/B/C/D/E Controllers
  • Demonstrates Active-Current-Limit Feature
  • Programmable Output-Load Current Limit
  • Programmable Current-Limit Timer
  • Fast Current-Limit Response Time
  • Latch or Autoretry Fault Management
  • Programmable Undervoltage Lockout
  • Overcurrent Active-Low FAULT Status Indicator
  • Surface-Mount Construction
  • Fully Assembled and Tested

Product Details

The MAX5943A evaluation kit (EV kit) circuit demonstrates the hot-swap, current-limiting, and power-ORing functions of the MAX5943A. The MAX5943A EV kit is intended for 7.5V to 37V IEEE 1394™/FireWire® applications. The MAX5943A controls two n-channel MOSFETs to regulate load current from an input power supply and perform low-voltage-drop power-supply ORing. The MAX5943A EV kit can also be used to evaluate the MAX5943B/C/D/E versions (refer to the MAX5943 IC data sheet).

The MAX5943A EV kit features several jumpers to evaluate different configurations of the MAX5943A. The output current limit, current-limit timeout period, ORing threshold, and fault-management features are programmable. The undervoltage lockout threshold is configurable by installing external components. Shutdown mode can be controlled with an on-board switch or with an external logic signal. A active-low FAULT output signal is provided for fault condition monitoring.


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