LM4040CIX3-2.5+T

Noise - 0.1Hz to 10Hz:	--
Base Part Number:	LM4040
Supplier Device Package:	SC-70-3
Package / Case:	SC-70, SOT-323
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Current - Cathode:	65µA
Current - Supply:	--
Voltage - Input:	--
Noise - 10Hz to 10kHz:	35µVrms
Series:	--
Temperature Coefficient:	100ppm/°C
Tolerance:	±0.5%
Current - Output:	15mA
Voltage - Output (Min/Fixed):	2.5V
Output Type:	Fixed
Reference Type:	Shunt
Part Status:	Active
Packaging:	Strip

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Introduction

The LM4040CIX3-2.5+T is a Voltage Reference designed by Texas Instruments that falls into the category of Power Management ICs (PMICs). This voltage reference can provide a highly accurate output voltage that is maintained over a wide range of operating conditions with exceptionally low temperature drift. It was specifically designed for use in low to medium power supervisory circuits, meaning that it is capable of providing input voltage to signal processing devices or any other circuit which requires a regulated, highly accurate reference voltage.

Application Field

The LM4040CIX3-2.5+T is primarily used in low-power and high-accuracy applications that require an accurate output voltage, such as supervisory or control circuits. It is also suitable for use in other applications such as power supplies, data acquisition systems, operational amplifier reference sources, and battery-powered systems. Its high accuracy, low temperature drift and most importantly, its wide operating range, make it ideal for any system where power consumption and accuracy are of utmost importance.

Working Principle

The LM4040CIX3-2.5+T operates based on the principle of a Zener coupled with a current source. The Zener is used to establish a reference voltage, while the current source maintains the reference voltage over a wide range of operating conditions. At its heart, this voltage reference is a sophisticated temperature compensated bandgap reference circuit designed to hold the reference voltage extremely accurate over a wide operating temperature range.The voltage reference’s output voltage is determined by the Zener voltage and the external feedback current set by the user. By selecting a higher feedback current, the accuracy of this voltage reference can be increased over the typical accuracy of 0.25%. The adjustment pin can be used to provide a readjustment of the output voltage by up to +/-1.5% of the nominal voltage.At the heart of this voltage reference, is an internal bandgap reference, which can provide a stable and accurate output voltage. The bandgap reference works by monitoring the voltage across two identical diodes and comparing it to an internal reference voltage. If the two voltages differ enough, then the bandgap reference outputs an error signal to the current source which adjusts the current source value until the voltages line up, at which point the reference voltage is established.

Conclusion

The LM4040CIX3-2.5+T voltage reference is an excellent option for any low-power, high-accuracy application. Its wide operating range and exceptionally low temperature drift make it ideal for any application which requires an accurate output voltage. With the added adjustability and ability to calibrate the output, this voltage reference is well-suited for many applications and is an excellent choice for a high-accuracy and low-power reference solution.

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