The MP5991 is an integrated, monolithic controller and switch with a power MOSFET and other circuitry that allows it to operate alone or to be controlled via a hot-swap controller. The device can drive up to 50A of continuous output current (I_OUT) per device at room temperature, and up to 60A of continuous I_OUT with air flow.

The device limits the backplane voltage drop by limiting the inrush current to the load while a circuit card is inserted into a live backplane power source. It limits the internal MOSFET current (I_FET) by controlling the gate voltage (V_GATE) via the current limit (I_LIMIT) reference input and soft-start (SS) ramp.

The MP5991 provides many features to simplify system design, such as an integrated current mirror to monitor I_OUT and the integrated on-die temperature sense. This eliminates the need for an external current-sense power resistor, power MOSFET, and temperature-sense device.

The IC detects the power MOSFET's gate, source, and drain short conditions. It also provides feedback to the hot-swap controller via the fault-reporting output (GOK). The MP5991 can operate in parallel for high-current applications. During start-up, all of the devices in parallel actively share current.

The MP5991 is available in an LGA-32 (5mmx5mm) package.