The FPF2193, FPF2194, and FPF2195 form a series of load switches that provides full protection to systems and loads that may encounter loarge current conditions. These devices contacin a 55 mΩ current-limited P-channel MOSFET that can operate over an input voltage range of 1.8 to 5.5 V. Internallly, current is prevented from flowing when the MOSFET is off and the output voltage is higher than the input voltage. Switch control is by a logic input (ON) capable of interfacing directly with low-voltage control signals. Each part contains thermal shutdown protection that shuts off the switch to prevent damage to the part when a continuouse over-current condition causes escessive heating. When the switch current reaches the current limit, the parts operate in the a constant-current mode to prohibit excessive currents from causing damage. For the FPF2193 and FPF2194, if the constant current condition still persists after 30 ms, thhe parts shut off the switch and pull the fault signal pin (FLAGB) LOW. The FPF2193 has an auto-restart feature that turns the switch on againafter 450 ms if the ON pin is still active. The FPF2194 does not turn off after a current limit fault, but remains in the constant-current mode indefinitely. The minimum current limit can be set as low as 45 mA.