The new MAX16914 and MAX16915 from Maxim are over-voltage protection controllers for automotive and industrial systems that must tolerate high-voltage transient and fault conditions. They employ a unique architecture that senses the input and output voltages of two back-to-back p-channel MOSFETs to provide over-voltage protection with ideal-diode characteristics. When forward biased, the two pFETs have a voltage drop that is much lower than a traditional blocking diode; during reverse-battery fault conditions, they are turned off to prevent reverse current flow. The devices are well suited for automotive applications requiring over-voltage protection and very low voltage drop during cold-crank conditions.
The ICs operate from only 30 μA of quiescent current. The over-voltage threshold is resistor adjustable and uses an indicator flag to alert the system to an over-voltage event. The devices also include over-temperature protection circuitry that turns off both external MOSFETs to protect the system. The MAX16914 functions as an over-voltage switch and disconnects the input and output during over-voltage events, while the MAX16915 operates as a limiter that regulates the output to the set upper threshold. Both devices are fully specified over the -40°C to +125°C automotive temperature range. They are AEC-Q100 qualified and are available in a thermally enhanced, 10-pin μMAX package.
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