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

Applications

Power Management

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party