ISL21080DIH312Z-TK

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The ISL21080DIH312Z-TK is a 3.12V fixed output, low dropout, high precision shunt voltage reference. The device is manufactured using the Intersil’s proven high-voltage complementary bipolar process. The monolithic integrated circuit is available in the thermal enhanced 3-pin SC70 package. The ISL21080DIH312Z-TK is a member of Intersil’s family of precision Surface-Mount Voltage References.

Application Field of ISL21080DIH312Z-TK

The ISL21080DIH312Z-TK offers low-noise, high accuracy and high precision voltage reference solution for a variety of power management applications. With its low power consumption and outstanding temperature coefficient, it finds application in many power-sensitive, low-noise systems. Typical applications include multichannel data acquisition systems, instrumentation systems, medical instrumentation, automotive electronics, industrial process controls, digital scale systems, temperature measurement systems, battery-powered circuitry, etc.

Working Principle of ISL21080DIH312Z-TK

The ISL21080DIH312Z-TK integrates the voltage reference, current-limiting, and temperature compensation circuitry into a single, compact device. The voltage reference potential is determined by the zener breakdown voltage of the device. This potential is maintained with the help of a negative feedback loop. The loop keeps the current through the device limited, which in turn maintains the reference voltage. The ISL21080DIH312Z-TK operates as a precision voltage reference at low input voltages, up to 15V.

The temperature compensation circuitry stabilizes the reference voltage, over a wide range of environmental temperatures. This helps maintain the accuracy of the voltage reference and reduce the need for calibration. The temperature compensation also reduces the total current consumption of the device. The current limitation is provided by two matched bipolar transistors that are operated in the saturation region. This helps control the current and ensure that it remains well below the absolute maximum current rating of the device.

The ISL21080DIH312Z-TK provides single pin enable/disable functionality. When disabled, the current consumption of the device decreases significantly, and the voltage reference output is ‘floated’. This helps conserve power in applications where the voltage reference may not be required to be enabled all the time. The device also features a low-noise sense pin, which can be used to reduce the noise in the voltage reference output.

Conclusion

The ISL21080DIH312Z-TK voltage reference is an ideal solution for power-sensitive, low-noise applications. It offers integrated current-limiting, temperature compensation, and enable/disable functionality. The device is capable of providing accurate, stable voltage reference even at low input voltages. All these features make it suitable for a variety of power management applications.

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