MAX5943EEEE+

The MAX5943EEEE+ is a FireWire current limiter and low-drop ORing switch controller in 16 pin QSOP package. This device controls two external power n-channel MOSFETs to regulate current from the input power supply to the load and performs low voltage-drop, power-supply ORing. It is FireWire/IEEE 1394™ protective circuit is UL® recognized. It allows safe insertion and removal of FireWire peripherals into a live FireWire port by providing inrush current control and an output current limiting function. 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 both external MOSFETS it provides a true bidirectional load disconnect. A low-current shutdown mode disables IC resulting in less than 10µA supply current. It is used in FireWire desktop/notebook port, FireWire peripheral device current limit, FireWire hub and hot swap.

• Supply voltage range is 7.5V to 37V
• Operating temperature range from -40°C to 85°C
• Low drop power ORing with ultra-fast turn-off
• ±5% current limit sensing accuracy
• Provides inrush and output current limit
• ON/OFF control allows undervoltage lockout programming
• Programmable circuit breaker, overcurrent fault status output
• Drives external N-channel power MOSFETs
• Latched or autoretry overcurrent fault management
• 10µA shutdown current, fast load disconnect control through ON input

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Power Management

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