The MAX4840EXT+T is an overvoltage protection controller with status FLAG in 6 pin SC-70 package. The device protects low voltage systems against voltages of up to 28V. If the input voltage exceeds overvoltage trip level, the MAX4840 turns off the low cost external N-channel FET to prevent damage to protected components. An internal charge pump eliminates the need for external capacitors and drives FET gate for a simple and robust solution. In addition to single FET configuration, the device can be configured with back to back external FETs to prevent currents from being back-driven into adapter. On power-up, the device waits for 50ms before driving GATE high. The active-low FLAG is held low for an additional 50ms after GATE goes high before deasserting. The MAX4840 has an open-drain active-low FLAG output. The active-low FLAG output asserts immediately to an overvoltage fault.
Input voltage range from 1.2V to 28V
Operating temperature range from -40°C to 85°C
Undervoltage lockout (UVLO) threshold of 3.25V and undervoltage lockout hysteresis of 50mV
Internal charge pump circuitry
Overvoltage trip level of 5.8V and overvoltage trip level hysteresis of 80mV
IN supply current of 140µA and UVLO supply current of 150µA
15KV ESD protected input (when bypassed with 1µF capacitor)
