MAX6791TPTD2+

Introduction

The MAX6791TPTD2+ is part of the MAXIM\'s "Industrial and Communications" product family. As a member of the Supervisors product series, it is designed to secure reliable operation during power-up and power-down, while providing over-voltage and reverse-voltage protection. It is a voltage detector with a range of 1.6V to 10V, a 200mV hysteresis, and adjustable power-on delay (from 0 to 1ms). The MAX6791TPTD2+ is available in the SOT23-5 and UDFN-5 packages, and offers a wide range of applications.

Application Field

The MAX6791TPTD2+ is targeted primarily for industrial and communication applications. It provides enhanced protection for micro-controllers and processors, helping to keep systems from loss of power, reverse-voltage damage, or over-voltage damage. It is well-suited for applications that require hard reset for micro-controllers or processors, where it can serve as a watchdog timer or manual reset button. It can also be used for power management systems, where its adjustable power-on delay can help to avoid false triggering.

The MAX6791TPTD2+ can also be applied in automotive environments, such as automotive battery monitoring, battery management systems, and switching regulators. Its low current consumption and adjustable reset threshold make it well-suited for automotive power applications.

The MAX6791TPTD2+ is also a good choice for embedded systems, digital power supplies, and other applications where reliable power protection and over-voltage protection must be present.

Working Principle

The MAX6791TPTD2+ operates by detecting the voltage of the system, and then triggering a power-on delay or reset pulse when the voltage goes either over or below its preset threshold. The MAX6791TPTD2+ has adjustable voltage thresholds, which are set by using external resistors. It also has an onboard voltage reference, and a reset pulse time adjustable from 0 to 1ms. After a power-on delay, the MAX6791TPTD2+ will provide a reset pulse to reset the system. It also has an integrated open-drain POR status output, to indicate when the system has been reset.

When the system is in a power-down state, the MAX6791TPTD2+ will instantly detect any voltage below the reset threshold and trigger a reset. The reset will occur as soon as the voltage is brought below the reset threshold, with a proportional delay depending on the reset threshold setting.

The voltage detection circuit in the MAX6791TPTD2+ is composed of a voltage comparator with a pre-set voltage threshold, a voltage reference, and a level threshold detect circuit. This ensures that the MAX6791TPTD2+ will detect only valid over/under-voltage signals.

Conclusion

The MAX6791TPTD2+ is a powerful supervision device and protection system, ideal for industrial and communication applications. It is capable of detecting over/under-voltage signals, and providing an adjustable power-on reset signal. The adjustable reset threshold, power-on delay, and open drain POR status output make it a great choice for systems that require reliable power protection and over-voltage protection.