REF5025IDGKR

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Introduction

A PMIC (power management integrated circuit) is an electronic unit that distributes and manages the flow of power from a power source (e.g., a battery) to other components within an electronic system. A voltage reference, also referred to as a voltage regulator, is a type of PMIC which controls and maintains a voltage at a precisely predetermined level. This is often utilized in battery-backed systems or systems in which the power supply is exposed to varying levels of noise.One particular application of voltage references for PMICs is in the REF5025IDGKR, a low-power precision voltage reference from Texas Instruments. This particular device is especially popular due to its simplicity and stability. In this article, we will discuss the application field and working principle of this voltage reference.

Application Field

The REF5025IDGKR is a low-power, low-dropout (LDO) voltage reference. This type of voltage reference is primarily used in precision instrumentation applications, such as data acquisition systems, digital signal processors, and other related applications. These applications require a reliable source of stable, low-noise power supply, and the REF5025IDGKR provides a highly stable solution, even with wide line and load-transient variations.The REF5025IDGKR also offers excellent temperature stability, making it highly suitable for applications where temperature drifts are a concern. Additionally, the device features programmable current consumption, allowing it to be customized to fit specific application requirements.

Working Principle

The REF5025IDGKR utilizes a bandgap voltage reference to maintain a stable output voltage. This bandgap reference is constructed from two transistors, the collector current of which is determined by the reference voltage, generating a output voltage that is proportional to the reference voltage. The reference voltage of the REF5025IDGKR is accomplished by a combination of an internally-generated temperature coefficient and a programmable current source. The device generates a set reference voltage by combining a 3V internal bandgap voltage reference and a precision programmable current source, allowing the user to easily adjust the device’s output voltage. The REF5025IDGKR features very low operating current, enabling it to be used in even the most power-sensitive applications. Additionally, the device features short-circuit protection, high PSRR, and excellent tolerance for variations in line and load voltage.

Conclusion

The REF5025IDGKR is an LDO voltage reference, ideal for precision instrumentation and data acquisition systems. This voltage reference utilizes a bandgap voltage reference that is composed of two transistors, and can easily be adjusted using an internally-generated temperature coefficient and a programmable current source. Additionally, the device features very low operating current, allowing it to be used in even the most power-sensitive applications. Overall, the REF5025IDGKR is an ideal solution in applications where a stable, reliable, and low-noise power supply is required.

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