The TPS22949 is a device that provides protection to systems and loads in high-current conditions. The device contains a 300-mΩ current limited P-channel MOSFET that can operate over an input voltage range of 1.62 V to 4.5 V as well as a low-dropout (LDO) regulator with a fixed output voltage of 1.8-V. The switch is controlled by an on/off input (EN1), which is capable of interfacing directly with low-voltage control signals. When the switch current reaches the maximum limit, the TPS22949 operates in a constant-current mode to prohibit excessive currents from causing damage. If the constant current condition still persists after 10ms, these parts will shut off the switch and pull the fault signal pin (OC) low. The TPS22949 has an auto-restart feature, which will turn the switch on again after 80ms if the EN1 pin is still active. The TPS22949 is available in a space-saving 8-terminal WCSP (YZP) or in an 8-pin SON package (DRG). Both are characterized for operation over the free-air temperature range of –40C to 85C.