ISL8700AIBZ-T

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PMIC - Supervisors: ISL8700AIBZ-T Application Field and Working Principle

The ISL8700AIBZ-T is a low-power, low-voltage supervisor designed to monitor power supply systems and provide overvoltage protection. It is available in a miniature 8-pin wafer level chip scale package (WLCSP). The device is commonly used in applications such as digital audio systems, microcontrollers, digital TVs, DVD players, and notebook computers. This document explains the basic application fields, features, and working principle of the ISL8700AIBZ-T.

Application Field

The ISL8700AIBZ-T is ideal for monitoring and protecting power supply systems in digital audio, microcontroller, and other general-purpose applications.

• Digital Audio Applications – The device offers overvoltage protection for digital audio systems, such as DVD players, Notebook computers, and portable media players.
• Microcontrollers – The device is well-suited for microcontroller applications, including digital TV receivers and set-top boxes. It provides reset and VDD monitoring, as well as overvoltage protection.
• General – The device has a wide range of applications, including general-purpose power supply monitoring and protection.

Features

The ISL8700AIBZ-T offers a variety of features to make it ideal for power supply monitoring and overvoltage protection. These features include:

• Wide Input Voltage Range – The device has an input voltage range of 2.5V to 18V, making it suitable for a wide range of applications.
• High Accuracy – The device offers a high accuracy of ±1.5% over the entire temperature range.
• Low Supply Current – The device has a low supply current of 180µA, making it suitable for low-power applications.
• Overvoltage Protection – The device has an integrated overvoltage protection (OVP) circuit, which protects against overvoltage conditions.
• Temperature Monitor – The device has an integrated temperature monitor, which can be used to detect excessive junction temperatures.
• Reset Timer – The device has an integrated reset timer, which can be used to initiate a system reset if the voltage remains out of range for a specified period of time.
• Compact Package – The device has a small 8-pin WLCSP package, making it ideal for space-constrained applications.

Working Principle

The ISL8700AIBZ-T’s working principle is fairly straightforward. The device monitors the input voltage, and if the voltage becomes too high or too low, the device will initiate a reset or overvoltage protection sequence.

The device consists of four basic parts: an amplifier, a voltage reference, a comparator, and a reset/OVP timer. The amplifier amplifies the input voltage, and the voltage reference is used to set the trip points. The comparator compares the amplified voltage with the voltage reference, and the reset/OVP timer controls the reset and OVP sequences.

When the input voltage falls outside of the established trip points (too high or too low), the comparator will trigger a reset or an OVP sequence. The reset/OVP timer will then initiate the reset or OVP sequence. When the input voltage returns within the established trip points, the reset/OVP timer will reset the system, ending the reset/OVP sequence.

Conclusion

The ISL8700AIBZ-T is a low-power, low-voltage supervisor designed for digital audio, microcontroller, and general-purpose applications. The device offers features such as a wide input voltage range, high accuracy, low supply current, overvoltage protection, temperature monitoring, and reset timer. The working principle of the ISL8700AIBZ-T is simple and straightforward, making it an ideal choice for power supply monitoring and overvoltage protection.

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