MAX5943EEEE+ (MAXIM INTEGRATED PRODUCTS)

The MAX5943EEEE+ from Maxim Integrated Products 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.