MN1381-S

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A Power Management Integrated Circuit (PMIC) is a semiconductor device used to control and regulate the power supply of a digital system. Supervisors, or supervisor circuits, are a type of PMIC designed to detect and monitor power supply faults, in order to ensure that the system is always in a stable operating state. The MN1381-S is a very popular supervisor and this article will discuss its application field and working principle.

The MN1381-S supervisor, produced by Semtech Corporation, is a high-accuracy, low-cost portable power solution designed for applications that require precision and stable voltage regulation, such as cell phones and other portable electronics. It is also suitable for automotive applications and other industrial applications that call for high-accuracy voltage regulation. The supervisor features an adjustable voltage selector between 2.2V and 3.6V, with a prescaler programmable to select from 0.5V to 3.55V in 0.05V increments. The device also has a watchdog timer output with a programmable timeout period from 2 ms to 32 seconds.

The MN1381-S integrates multiple system power rails, a power-on reset generator, and a power-good indicator. The device can detect power-failures, brownouts, and VCC overvoltage events, and provide reset signals when these events occur. The device also provides integrated short-circuit protection and adjustable power-on delay times. In addition, the device offers an adjustable margin detect voltage, which can be programmed with external resistors to precisely detect power-outage events up to 4% below the tolerance level of the application.

The core of the MN1381-S is a voltage-controlled oscillator, which helps to precisely monitor voltage. It also contains an error-amplifier, comparators, and logic gates, which are all used to provide precise accuracy and control. The device also has two adjustable thresholds for detecting brownouts (Low and High). This helps to ensure that the system is always operating optimally and that the power supply does not fail unexpectedly. In addition, the device has an adjustable tolerance level setting, which can be used to limit the current drawn from a supply to a predetermined level.

The MN1381-S also has an integrated digital counter, which provides an indication of the voltage level at any given time. This feature helps to reduce the risk of silent system failures, since the user can easily determine the supply level at any given moment. The digital counter is also useful for debugging and ensuring the stability of a system.

In conclusion, the MN1381-S is a very useful supervisor with multiple features designed to improve the reliability and accuracy of a system. Its adjustable voltage selector, prescaler programmable to select the voltage, power-on reset generator, and adjustable tolerance level setting provide precise control and monitoring of the system. It also contains a digital counter and watchdog timer output, which can be used to detect and diagnose faults and prevent silent system failures. The MN1381-S is suitable for use in multiple application fields, including cell phones, automotive systems, and other industrial applications that require precise and stable voltage regulation.

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