The MAX4881MAX4884/MAX4893B overvoltage protection (OVP) controllers with built-in current-limited switch, protect low-voltage systems against voltages of up to 28V. When the input voltage exceeds the overvoltage trip level of 5.6V (MAX4881/MAX4883/MAX4893B) or 4.5V (MAX4882/MAX4884), the external n-channel MOSFET is turned off to prevent damage to the protected components. An undervoltage/overvoltage flag indicator (OV) notifies the processor that an undervoltage/overvoltage fault condition is present. The MAX4881/MAX4882 feature an internal 1.1A current-limited switch, while the MAX4883B/MAX4883C/ MAX4884B/MAX4884C include an internal 0.7A currentlimited switch. The MAX4893B includes a 0.9A currentlimited switch. When the load current is at the current limit for longer than the blanking time, the switch of the MAX4881/MAX4882/MAX4883B/MAX4884B/ MAX4893B latches off and does not turn back on until EN, CB, or IN is cycled. A current-limit flag (FLAGI) asserts to indicate a current fault condition. The MAX4883C/MAX4884C limit the current to 0.7A indefinitely until the thermal protection trips. An overcurrent flag output asserts to indicate a current fault condition after the blanking time has elapsed.