MAX697EWE+

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PMIC - Supervisors: MAX697EWE+ Application Field and Working Principle

PMIC (Power Management Integrated Circuit) Supervisors are integrated circuits that specifically monitor and control the power in electronic systems. They are essential to any electronic project as these integrated circuits are responsible for calculating the power delivered to each component, protecting components from overtemperature, controlling the power supply voltage stability, and optimizing the battery life of a device. The MAX697EWE+ is a high performance PMIC supervisor made by Maxim Integrated. This IC can be used to manage power in a range of applications, including system parameter compensation, power supply sequencing and sequencing, limited transient protection, and system fault monitoring.

Overview of the MAX697EWE+

The MAX697EWE+ is an adjustable voltage supervisor, intended for use in a wide range of consumer and automotive applications. Its features include ultra-low quiescent current and an adjustable reset threshold feature. The voltage range of the MAX697EWE+ is 1.2 volts to 5.5 volts (with a 2.7V minimum operating voltage). It is capable of monitoring up to two supply or power rails, restarting system transients, and providing individual reset outputs.

Applications of the MAX697EWE+

The adjustable reset threshold feature of the MAX697EWE+ makes it suitable for a number of applications. It can be used in automotive power systems, such as fuel systems, airbag systems, air conditioning systems, and engine control systems, to monitor battery and power-supply voltage for safe operation. It can also be used in consumer applications, such as cell phones, digital cameras, and wearables, to provide early warning of low battery power or unfavorable system conditions. Additionally, the MAX697EWE+ can be used in computers, digital televisions, and DVD players, for power-up sequencing, hang-up detection, and over-voltage protection.

Working Principle of the MAX697EWE+

The MAX697EWE+ uses the concept of a comparator to monitor the supply voltage. The comparator monitors the supply voltage and compares it to an adjustable reset threshold voltage (VTH). If the supply voltage is equal to or below VTH, the reset output is asserted, and the reset (RST) and reset output (OUT) are driven low. Conversely, when the supply voltage is above VTH, the reset output is not asserted, and the RST and OUT are driven high.

The MAX697EWE+ also provides a delay (tDLY) feature, which allows the supervisor to delay the assertion of the reset line output until the supply voltage is below the reset threshold voltage for a predetermined length of time. If the supply voltage overshoots the reset threshold, the reset output will remain deasserted until the delay time has expired. This feature allows for efficient power sequencing during system restart.

Conclusion

The MAX697EWE+ is a high performance and highly adjustable PMIC supervisor from Maxim Integrated. Its adjustable reset threshold feature and delay time feature make it suitable for a wide range of applications, from automotive to consumer and from digital televisions to wearables. Additionally, its ultra-low quiescent current and wide input voltage range make it an ideal choice for power management applications.

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