The MAX16128/MAX16129 load-dump/reverse-voltage protection circuits effectively protect the power supply from extreme input voltages, including overvoltage, reverse voltage, and transient high-voltage pulses. Under extreme conditions (such as automotive load dump or reverse battery), the device cuts off two external back-to-back n-channel MOSFETs through internal charge pump control, blocking the power supply to the downstream circuit. The low 3V operating voltage ensures normal operation in cold-crank conditions. These devices have a warning indication output (FLAG) that triggers an alarm under fault conditions.
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