LM4050QAIM3-2.5/NOPB

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Power management integrated circuits (PMICs) are one of the most popular integrated circuits used in modern electronics. They find applications in almost every electronic design and are used for various power-related functions, such as voltage and current regulation, DC/DC converter control, protection and monitoring. One such example is LM4050QAIM3-2.5/NOPB, a voltage reference family of PMICs manufactured by Texas Instruments.

Overview

The LM4050 family of voltage reference ICs belong to the precision voltage reference family of PMICs. It is designed to provide ultra-low drift and very low temperature coefficient voltage reference with excellent temperature stability and long-term stability. The device offers adjustable voltage reference with low operating current of only 2.5 μA, designed to deliver high output accuracy over temperature and time while meeting tight space requirements. It operates from a voltage supply of either 4.5V to 15V and provides a wide output range from 0.2V to 10V and comes in two versions: single-channel, powered by an external capacitor, and dual-channel, powered by an onboard capacitor.

Features and Benefits

The LM4050QAIM3-2.5/NOPB offers several important features and benefits, including:

• Low Operational Current: The device operates at an extremely low supply current of only 2.5 μA, which lowers the overall power consumption of the system.
• High Accuracy and Linearity: The device offers excellent accuracy, over temperature and time, of ±0.5% maximum drift and ±5 mV maximum offset.
• Operating Environment: The devices are guaranteed to operate over a wide range of temperature from -40°C to 125°C.
• Small Sizes: These devices come in the small 3-pin TO-92 package and the small 5-pin SOT-23 package.
• High Immunity to Transients: This device offers excellent immunity to noise and transient events on the power supply line.

Applications

The LM4050QAIM3-2.5/NOPB is suitable for a wide range of applications, such as shunt regulation, universal current sources, electronic load control, precision voltage or current sources, PC board power supplies, voltage regulation, reference sources and many more. These devices are primarily used in portable electronics, computers, automotive control, industrial control systems and communications equipment.

Working Principle

The basic working principle of the LM4050 series is based on the self-biased bandgap principle. In this principle, a pair of voltage references are connected back-to-back in the same IC, which allows the device to operate with higher accuracy. The reference voltage is generated by a differential amplifier, which compares the voltage across a pair of precision resistor networks to the voltage across a reference diode. The reference diode is also used as a temperature compensation device. The amplified voltage is then buffered and regulated by an on-chip voltage regulator which maintains a constant output voltage. This regulated output voltage is then compared with the voltage across the reference resistors to ensure accuracy and stability.

Conclusion

The LM4050QAIM3-2.5/NOPB is a voltage reference PMIC manufactured by Texas Instruments that features ultra-low drift and very low temperature coefficient voltage reference. It offers adjustable voltage reference with low operating current of only 2.5 μA, designed to deliver high accuracy over temperature and time. This device is suitable for a wide range of applications and is primarily used in portable electronics, computer, automotive control, industrial control systems and communications equipment. It works on the self-biased bandgap principle, which consists of two voltage references connected back-to-back in the same IC. This allows the device to operate with higher accuracy and stability.

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