MAX794ESE+

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PMIC, or power management integrated circuits, bridge the gap between hardware components and system level hardware and software control. In particular, PMICs are essential components on many embedded systems, enabling monitoring, supervision, and control of voltage and current signals and managing power distribution in the system. The MAX794ESE+ is a particular example of a PMIC, and it offers a number of benefits and applications for embedded systems, largely due to its ability to protect against and ensure voltage and current levels. This article will offer an overview of the MAX794ESE+ and its application field and working principle.

Overview

The MAX794ESE+ is a voltage supervisor integrated circuit (IC) designed to monitor a fixed voltage input in order to provide system reset, presence indicating, and low-power auto-shutdown. The device has an operating temperature range from -40°C to 85°C, when powered from 2.7V to 5.5V. It is a single-pole double-throw non-inverting device with a low standby current of only 4uA and a large number of features including temperature compensating reset timing, low output leakage, and an adjustable reset time delay.

The MAX794ESE+ also features an active-low open drain N-channel reset output, a low minimum reset input threshold of 1.0V, and a wide reset timeout range with a 400ms maximum. It runs on a 1.1V to 5.5V supply current and can sink up to 50mA of current, while allowing a maximum voltage of 5V. It has low quiescent current (1uA) and only 4uA of static current, making it ideal for low-power applications.

Application Field and Working Principle

The MAX794ESE+ is a useful solution for system-level power management, particularly when it comes to monitoring a fixed voltage in order to provide system reset, presence indicating, and low-power auto-shutdown. Its low standby current of only 4uA makes it ideal for battery-operated embedded systems, as it consumes less power than other comparable voltage supervisors. The device can protect from dangerous overvoltage conditions, trigerring a reset if the voltage deviates from the desired level. The device also monitors the input voltage and can trigger a reset if the voltage drop is too low.

In terms of its working principle, the MAX794ESE+ monitors a fixed voltage and then compares it to an internal reference voltage. If the input voltage rises above the reference voltage, a reset is triggered, thus protecting from any dangerous overvoltage conditions. Similarly, if the input voltage drops too low, the reset is triggered. The reference voltage is typically set to a level that is lower than the nominal input voltage level and is adjustable depending on the application.

In conclusion, the MAX794ESE+ is a powerful PMIC that provides a range of features to ensure voltage stability and system reset for embedded systems. Its adjustable reset time delay, low quiescent current, and temperature compensating reset timing make it ideal for battery-powered embedded systems. In these instances, its low static current of 4uA and the reliable protection from over and undervoltage conditions make it a potent and essential component.

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