MAX5944ESE

The MAX5944ESE 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 MAX5944ESE 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 MAX5944ESE 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 MAX5944ESE 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 MAX5944ESE 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 MAX5944ESE operates over the -40°C to +85°C extended temperature range and is available in a 16-pin SO package.

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