MAX6340UK46+T

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MAX6340UK46+T Application Field and Working Principle

The MAX6340UK46+T from Maxim Integrated is part of the MAX6341 family of 3.3V Company Supervisors. It is a low-power, 3.3V programmable reset IC (integrated circuit) with overvoltage protection, undervoltage protection and adjustable watchdog functions. This supervisor is designed to improve system reliability by monitoring the voltage supply and signaling a reset when a fault occurs.

The MAX6340UK+T is an ideal choice for applications where ultra-low power consumption is needed, such as in remote and alternative energy systems, while meeting strict safety requirements. It is rated over the -40°C to +105°C temperature range and available in an 8-pin TDFN surface mount package for minimal space and form factor.

Applications

The MAX6340UK+T is a supervisor IC suitable for a wide range of application, from large mainframes and mobile devices to smaller embedded systems, such as in set-top boxes (STB), cameras, and portable gaming systems. Additionally, the supervisor is suitable for applications that require high system stability, such as in automotive, lighting, and medical equipment.

Features

• Ultralow-power operating current
• OVP monitoring and protection to prevent system resets, short circuits and system damage
• Full-performance input voltage range between 1.2V and 5.5V
• Reset output signal active at reset condition, in both manual and watchdog reset modes
• UVLO overvoltage protection with user-adjustable delay time
• Watchdog timer monitored externally via the WDSEL pin
• Up to 8V reset-threshold accuracy
• Adjustable reset delay (tDLY) or watch-dog timeout period (tWD)
• 8 pin TDFN surface mount package

Working Principle

The MAX6340UK+T supervisor is a relatively simple circuit. It consists of three basic components: an input voltage supervisor and two comparators that are connected to the supervisor’s output reset pin. The input voltage supervisor monitors the power supply input and will activate an internal reset signal if the power supply voltage falls below the low-voltage threshold. When the power supply voltage exceeds the high-voltage threshold, the supervisor will deactivate the reset signal.

The two comparators are triggered by the supervisor’s reset pin. When the voltage at the reset pin exceeds the reset-threshold voltage, the comparator will activate the reset signal. As the voltage drops below the reset- threshold voltage, the reset signal will be deactivated. This will cause the reset pin to be released from the reset state and the system will start to operate again.

The MAX6340UK+T supervisor also offers a watchdog function, which allows the user to monitor system performance by triggering a reset if the system fails to complete a given task in a certain period of time. This watchdog period can be adjusted via the WDSEL pin, which is connected to the watchdog timer. When the timer elapsed and the reset occurs, the watchdog pin returns to its inactive state and the system will start to operate again.

Conclusion

The MAX6340UK+T supervisor is an ideal choice for applications where high system stability and low-power are needed. It offers overvoltage protection, undervoltage protection and adjustable watchdog functions, and is available in an 8-pin TDFN surface mount package for minimal space and form factor. The MAX6340UK+T is suitable for applications such as in remote and alternative energy systems, automotive, lighting and medical equipment.

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