MAX6793TPTD3+

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PMIC - Supervisors are often used in medical and industrial applications, due to their safety features and superior voltage regulations. The MAX6793TPTD3+ is a robust, high accuracy reset supervisor which provides a wider power range, improved accuracy, and advanced features to ensure a safe and reliable operation in equipment. This application note provides an overview of the MAX6793TPTD3+ application field and working principle.

Introduction

MAX6793TPTD3+ is a 5-pin, single-supply supervisor with an internal reference voltage of 1.8V. It is designed to safely power-on and power-down sensitive low-power electronic systems by accurately monitoring and automatically resetting the system. It provides user-defined reset timeout from 20ms to 60 seconds and all the functions are fully integrated in the chip. Its features include a margining function with +/- 0.2% accuracy to indicate a reset event, watchdog timer for system initialization, latch-up protection in case of overshoot, wake-up system and reset detect signals.

Application Field

MAX6793TPTD3+ is a highly-integrated reset supervisor and is widely used in medical and industrial applications due to its low power consumption and reliable safety features. In medical applications, it is used to monitor and regulate power output and efficiently power-up patient monitors and other medical electronic equipment. In industrial applications, MAX6793TPTD3+ is used to protect factory automation systems and other power sensitive equipment in accordance with industrial health and safety standards. In addition, the MAX6793TPTD3+ reset supervisor is ideal for use in Portable Electronics, Set-top Boxes, Automotive, and many other commercial applications.

Working Principle

MAX6793TPTD3+ works by detecting voltage levels and resetting the system when needed. It features a reset timeout that is user configurable from 20 ms to 60s. This reset timeout can be programmed to match the power-up sequence of the system. The reference voltage is programmed to the power-up level of the system and is monitored using a comparator. When the reference voltage exceeds the power-up level, the supervisor sends a reset signal to the system. The reset signal is generated by the supervisor\'s pulse-width modulator, which produces a reset pulse of duration 50 ms or 10 ms, depending on user selection. The reset pulse can actuate a MOSFET or NMOS Gate, or be used to directly reset the system or activate an interrupt pin.

The MAX6793TPTD3+ supervisor also provides a wake-up system, which detects the falling edge of the input voltage and initiates a power-down sequence. This wake-up system prevents the system from entering a low power mode, thereby replacing the need for additional components such as a supervisory IC or a supervisor powered by an external voltage source. In addition to reset timeout, margining function, and wake-up system, the MAX6793TPTD3+ also features protection against current spikes, an EMI filter, noise rejection, and regenerative feedback sensing.

Conclusion

MAX6793TPTD3+ is a reliable, high-performance reset supervisor for medical and industrial applications. It is a single-supply supervisor with an internal reference voltage of 1.8V and a user-defined reset timeout. It is designed to detect voltage levels and reset the system when needed and provides a wide set of features such as reset timeout, margining function, wake-up system, latch-up protection, and EMI filter and noise reduction.

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