LM4120AIM5X-3.3

Noise - 0.1Hz to 10Hz:	20µVp-p
Base Part Number:	LM4120
Supplier Device Package:	SOT-23-5
Package / Case:	SC-74A, SOT-753
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Current - Supply:	275µA
Voltage - Input:	2 V ~ 12 V
Noise - 10Hz to 10kHz:	36µVp-p
Series:	--
Temperature Coefficient:	50ppm/°C
Tolerance:	±0.2%
Current - Output:	5mA
Voltage - Output (Min/Fixed):	3.3V
Output Type:	Fixed
Reference Type:	Series
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

The LM4120AIM5X-3.3 is an integrated voltage reference from Texas Instruments. It is an ultra-precision low-dropout voltage reference and is capable of providing a highly accurate output voltage without the need for an external reference. With a maximum output current of 500 mA, the LM4120AIM5X-3.3 has a wide range of applications, ranging from precision amplifiers and power management to various industrial and scientific systems. This article will explore the application fields and working principle of the LM4120AIM5X-3.3.

Application Field of LM4120AIM5X-3.3

The LM4120AIM5X-3.3 is principally designed as a precision voltage reference and as such can be used in a wide range of applications. It can be used to accurately adjust the output voltage of power supplies or other circuits, as well as a variety of converting devices such as digital-to-analog and analog-to-digital converters.The LM4120AIM5X-3.3 is also ideal for use in medical systems where accuracy and precision are of great importance. Its accuracy of ±0.5% makes it well suited to medical applications where exact voltage reference points are essential. In addition, the LM4120AIM5X-3.3 is specified for a wide temperature range of -40°C to 125°C, making it suitable for use in harsh environments without failure.The LM4120AIM5X-3.3 also finds application in various industrial systems, particularly those requiring high precision and accuracy when measuring or controlling power. Automated test equipment and process control systems are particularly well suited to applications using the LM4120AIM5X-3.3.

Working Principle of LM4120AIM5X-3.3

The LM4120AIM5X-3.3 is a bandgap reference based on the classical "dynamic emitter follower" topology. Developed by Texas Instruments, the LM4120AIM5X-3.3 uses a dynamic emitter follower circuit to generate an output voltage that is controlled by a reference voltage.The dynamic emitter follower circuit consists of a bipolar transistor, a resistor, and a capacitor. The reference voltage is applied to the base of the transistor, which then produces the output voltage at its emitter. The resistor and capacitor act as a "pole zero" network, allowing the output voltage to track changes in the reference voltage.The LM4120AIM5X-3.3 also incorporates temperature compensation and noise-filtering, allowing it to operate effectively over a wide temperature range. The output voltage is also remarkably stable, delivering accuracy of ±0.5% over its entire operating temperature range.

Conclusion

The LM4120AIM5X-3.3 is a precision voltage reference from Texas Instruments, capable of providing an accurate output voltage without the need for an external reference. Its wide range of applications makes it suitable for use in a variety of systems, such as medical systems, digital-to-analog and analog-to- digital converters, and process control systems. The LM4120AIM5X-3.3 works by using a dynamic emitter follower circuit to generate an output voltage that is controlled by a reference voltage. Its temperature compensation, noise-filtering, and exceptional accuracy make it an ideal choice for demanding applications.

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