MAX6879ETE+

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PMIC - Supervisors are regularly used in a variety of applications, such as automotive, consumer, industrial and medical. This article outlines the application field and working principle of the MAX6879ETE+, a supervisor IC from Maxim Integrated.

The MAX6879ETE+ is a high-performance supervisor for monitoring power supply rails in a wide variety of applications, including automotive systems, consumer electronics, industrial systems, and medical devices. It features a low quiescent current and on-chip voltage detection ranges that cover a wide input voltage range. The IC uses an internal resistor divider network to monitor up to two supply voltages from 2.6V to 38V at 1.8V steps, allowing it to be used in a variety of application environments.

The MAX6879ETE+ provides an active-low reset output with a wide range of reset thresholds, reset timeout delays, and filter options. It also features a dedicated push-button input to generate a reset pulse. The reset output is powered by a dedicated, open-drain driver for ultimate flexibility. Additionally, the MAX6879ETE+ features an optional watchdog input for system monitoring. This allows the supervisor to be used for systems with detailed safety certifications.

At the heart of the MAX6879ETE+ is a voltage detection circuit that monitors the voltage of an external supply. When the voltage dips below the programmed trip points, the MAX6879ETE+ will force the reset output low, indicating a reset condition. The reset thresholds can be user-adjustable and are set to a minimum of 1.68V. The reset thresholds also come with a wide range of reset timeout delays, allowing for a brief interruption in the supply to be safely ignored. The filter options provide further flexibility, allowing the user to select the filter configuration most appropriate for the application.

The MAX6879ETE+ also includes a power-on reset (POR) feature, which generates a reset pulse when the device is first powered up. This ensures that the system always starts from a known state. The device also featues on board temperature compensation, which ensures that the reset threshold remains constant over temperature.

The MAX6879ETE+ is highly integrated, with few external components. All the components are integrated on a single chip, which minimizes board space and simplifies power supply design. The MAX6879ETE+ is also extremely robust, with an operating temperature range of -40C to +85C, which makes it ideal for industrial grade applications. Additionally, the device offers ESD protection and radiation hardness, making it suitable for space grade applications.

As a supervisor IC, the MAX6879ETE+ is an ideal choice for monitoring power supply rails in a variety of application fields. Its wide input voltage range and adjustable reset thresholds, combined with low quiescent current and on-chip temperature compensation make it perfectly suited for use in automotive, consumer, industrial and medical applications.

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