Hot Swap controllers are used to drive an external FET in order to provide circuit protection by limiting inrush current and shutting off power to the load during a fault. Most Hot Swap controllers sense the voltage across a resistor and regulate the current by controlling the gate voltage of a MOSFET. Many of TI's Hot Swap controllers offer additional FET protection by reducing the current limit at higher VDS to ensure that the MOSFET stays within its safe operating area (SOA). This second layer of protection makes the Hot Swap solution more robust. Additional features may include: Under and Over Voltage (UV/OV) Protection, Analog or I2C/PMBus Control and Monitoring, and Fault and Power Good Flags.