ISL6131IRZA-T

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Power management integrated circuit (PMIC) allow for a variety of power supply functions in a single integrated circuit. Supervisors is a type of PMIC that provides a variety of power regulation and monitoring functions, such as power-on reset, watchdog reset, undervoltage monitoring and brownout detection. One of supervisors is ISL6131IRZA-T, designed to monitor power supply voltage and provide system reset, undervoltage lockout and windowed-reset functions.

ISL6131IRZA-T Application Field

ISL6131IRZA-T is a supervisor IC which provides a variety of power regulation and monitoring functions. Specifically, it is one of supervisors which can monitor supply voltage and provide system reset, undervoltage lockout (UVLO) and windowed-reset functions. This device is suitable for a wide range of applications, such as process control, ultrasound imaging, power-saving mode and battery management.

ISL6131IRZA-T provides three reset outputs, RESET, IN RESET and UVLO, two of which are controlled by the voltage monitor (Vmon), and one undervoltage lockout output (UVLO). The voltage monitor monitors the supply voltage (Vcc) and asserts the RESET and IN RESET outputs when the voltage drops below their respective thresholds. Also, when the supply voltage drops below a certain threshold (Vuvlo), the UVLO output is asserted, indicating an undervoltage condition.

Also, the ISL6131IRZA-T is designed to operate from 3.2V to 9V, with a wide operating temperature range of -55°C to +125°C, making it suitable for a wide range of applications.

ISL6131IRZA-T Working Principle

The voltage regulator contains an error amplifier, an overvoltage shutdown, an undervoltage shutdown, a current-limiting circuit, and short-circuit protection. This voltage regulator can achieve a maximum output voltage of 12.5V and is configured to turn off in the event of an overcurrent or short circuit. The error amplifier monitors the output voltage, setting it with its reference voltage. By adjusting the voltage reference value of the error amplifier, changes in output voltage can be made. An overvoltage shutdown is also integrated into this regulator to monitor the output voltage, turning off the power when an overvoltage event occurs.

The undervoltage protection circuit activates when the supply voltage falls below a predetermined level. When the voltage is below the threshold, an active low signal will be output, indicating that the circuit is in an undervoltage lockout mode. In addition, the regulator has a soft-start circuit to prevent inrush current when starting up the system.

ISL6131IRZA-T also includes a watchdog timer to issue a reset pulse when a system fails to complete a given task in the selected time period. The timer will time out and issue a reset pulse if the system fails to complete the assigned task in the acceptable time period. The reset pulse width is adjustable from 0 to 255 milliseconds, allowing the system to be easily set up to timeout after any specific task. It is also worth noting that the watchdog timer can be disabled when the system is functioning properly.

In addition, ISL6131IRZA-T can monitor the VCC-Vmon voltage and reset the system when the voltage falls out of the user-defined window. This window can be specified over a range of 0.2V to 6V. The device also provides power-on reset, generating a reset pulse whenever VCC rises above the specified threshold.

Conclusion

In summary, the ISL6131IRZA-T supervisor is a highly integrated device with a variety of power regulation and supervision functions in one integrated circuit. This device provides a convenient way to monitor the voltage and reset the system in the case of an undervoltage, overvoltage or power fail condition. Its wide operating temperature range and adjustable reset pulse make this device suitable for a wide range of applications.

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