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PMIC - Voltage Reference

The ADR391AUJZ-R2 is a precision bandgap voltage reference that is part of Texas Instruments\' family of Power Management Integrated Circuits (PMICs). This voltage reference uses a standard bandgap format, making it suitable for use in a variety of applications, such as precision power supply design, voltage reference circuits, and lighting control. It has a high output accuracy and linearity, and is designed to improve the reliability and accuracy of systems.

Application Field

The ADR391AUJZ-R2 is a good choice for applications that need precise voltage regulation and stability. Its accuracy allows it to be used in precision power supply design, providing accurate output voltage over the temperature range. It can also be used in LED lighting control, allowing the LED to maintain accurate, consistent brightness over its full lifetime.

It is also well-suited for use in voltage reference circuits, ensuring that circuit elements remain accurate over time and temperature changes. Its low impedance and high accuracy make it a good choice for many applications, particularly where a precise, stable reference is needed.

Working Principle

The basic principle of operation of the ADR391AUJZ-R2 is the bandgap reference. This principle involves a circuit consisting of two special diodes, a Zener diode and an LED. When the LED is forward biased, the diode\'s temperature dependent voltage drop is cancelled out by the Zener diode\'s constant voltage drop. The output voltage of this circuit is stable and independent of temperature, power supply, and circuit loading.

In the ADR391AUJZ-R2, the bandgap reference is further enhanced by the addition of a high speed bipolar transistor, precision resistors and capacitors. These components provide additional accuracy and stability, and allow the output voltage to be precisely trimmed to the desired voltage. The final output is a stable, low-impedance, precise reference voltage.

Summary

The ADR391AUJZ-R2 is a Power Management Integrated Circuit (PMIC) that can be used in a variety of applications that require precision voltage regulation. It uses a standard bandgap reference design, which is enhanced by the addition of additional components to ensure precise output voltage. The result is a low-impedance, stable reference voltage, suitable for LED lighting control, precision power supplies, and voltage reference circuits in many applications.

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