MAX706SEUA+

PMIC - Supervisors: MAX706SEUA+ Application Field and Working Principle

Power management ICs (PMICs) supervisors are special-purpose device designed to monitor important supply voltages in a system. Among these devices is the MAX706SEUA+, an ultra-low power (ULP) technology implementation of a supervisor, by Maxim Integrated. This PMIC supervisor provide system designers with the means to accurately detect, manage and handle voltagebrownouts, over-voltage and over-current conditions in a power system.

Features of MAX706SEUA+

The MAX706SEUA+ PMIC offers several features with respect to system monitoring and safety. These features include:

• Operates from 2.9 V to 4.63 V
• Supports power-on reset (POR) and manual reset
• –55 degrees Celsius to 125 degrees Celsius operation
• 1.22 V power-fail detector and low voltage detection
• Up to 450 mA outputs
• up to 7 monitoring/protection comparators and timers

Application Field of MAX706SEUA+

The MAX706SEUA+ PMIC supervisor is suitable for a wide range of applications, ranging from automotive and industrial power system applications, to consumer, smart grid, and mobile device applications. Examples include :

• Automotive and industrial systems, such as automobile remote starters, automotive chargers, automotive infotainment systems, HVAC systems, and smart motors.
• Consumer systems, such as consumer electronics, intelligent appliances, such as washing machines and refrigerators.
• Smart Grid networks and meters, for monitoring and control of electricity, gas, water and lighting systems.
• Mobile device power systems, such as tablets, notebooks, and smart phones.

Working Principle of MAX706SEUA+

The MAX706SEUA+ supervisor is designed to detect, monitor and manage several power conditions in a power system. The power-on reset (POR) comparator is the main component in the MAX706SEUA+. This comparator is used to monitor the system\'s power source and then issues an TTL high compatible assertion when the power source exceeds the POR threshold voltage. The POR output can be used to initiate a reset signal, while a manual reset input provides an external reset control signal.

The power-fail (VOF) comparator is used to detect a decrease in the system supply voltage when it falls below a programmed threshold voltage. This signal can be used to initiate a power-down procedure or switch over to a backup power supply. The MAX706SEUA+ also provides low voltage (LV) detection. This is used to detect a decrease in the supply voltage, and then provide an assert signal to initiate an event when the predetermined threshold value is exceeded.

In addition to power monitoring, the MAX706SEUA+ also offers fault detection and protection. This is done through the use of programmable over-voltage (OV) detection and over-current (OC) detection. The OV comparator is used to detect when the system power source exceeds the programmed threshold. The OV monitoring can be used to initiate a power-down procedure or set an interrupt for further processing. Similarly, the OC monitoring can be used to detect when the current drawn by the system exceeds the programmed threshold. This signal can be used to initiate interrupt or initiate a power-down procedure.

The MAX706SEUA+ is also programmed to provide delayed assert and reset signals. This is accomplished through the use of the built-in timers. The timers are used to provide a programmable delay before the assert signals are generated. This feature is particularly useful in power sequencing applications, where the supply voltages need to ramp-up and ramp-down in a programmed order.

Overall, the MAX706SEUA+ PMIC supervisor is a flexible and powerful monitoring and protection system for a wide range of applications. With its built-in power-on reset, over-voltage detection, low voltage detection and other features, the MAX706SEUA+ can be used to detect, monitor and protect against power system faults and brownouts.