LM4132CMF-2.0

Noise - 0.1Hz to 10Hz:	190µVp-p
Base Part Number:	LM4132
Supplier Device Package:	SOT-23-5
Package / Case:	SC-74A, SOT-753
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Current - Supply:	100µA
Voltage - Input:	2.448 V ~ 5.5 V
Noise - 10Hz to 10kHz:	--
Series:	--
Temperature Coefficient:	20ppm/°C
Tolerance:	±0.2%
Current - Output:	20mA
Voltage - Output (Min/Fixed):	2.048V
Output Type:	Fixed
Reference Type:	Series
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction
Today, we will be discussing the LM4132CMF-2.0 application field and working principle of voltage references, also commonly referred to as PMIC (Power Management Integrated Circuits). Voltage references are circuits that provide an absolute and highly accurate output voltage that is independent of changes in load and temperature. The LM4132CMF-2.0 is a high-accuracy, precision fixed voltage reference from Texas Instruments. This voltage reference has a wide application field and a wide temperature range for reliable operation.

Specifications
The LM4132CMF-2.0 operates over a wide temperature range of -40°C to +125°C, making it suitable for various applications in both commercial and industrial environments. With its tight line and load regulation, the LM4132CMF-2.0 can maintain a stable output voltage over a wide range of output currents, ensuring a high level of accuracy. The LM4132CMF-2.0 is also tolerant to line transients and has a low temperature coefficient and long-term stability. Available in an 8-pin MSOP package, the LM4132CMF-2.0 can be used with a variety of power supplies for efficient operation.

Applications
The LM4132CMF-2.0 is ideal for use in wide range of voltage reference applications such as 4-wire sensor measurements, current and voltage regulation, analog to digital converters, medical instruments, and automated test equipment. Additionally, this voltage reference can be used for multi-rail operational amplifiers and supply level translation applications. With its wide temperature range, tight line and load regulation, and low temperature coefficient, the LM4132CMF-2.0 is suitable for reliable operation in a variety of demanding applications.

Working Principle
The LM4132CMF-2.0 voltage reference works on a cascode architecture which combines a regulated current source with a voltage subtractor to achieve the specified output voltage. The regulated current source is composed of a transistor, two diodes and a Zener diode. The two diodes pressure the base-emitter voltage such that the voltage across the transistor’s base-emitter is constant, allowing the expression of a constant current. The Zener diode provides additional filtering and regulation of the current which would otherwise be a function of the power supply voltage. The voltage subtractor is composed of two transistors and a resistor. The output of the regulated current source is connected to the base of one of the transistors. The output of the voltage subtractor is set to the reference voltage of 2.0V; this output is then compared against the output of the regulated current source. The voltage difference is corrected by adjusting the base-emitter voltage of the second transistor in the voltage subtractor. Thus, the output of the voltage subtractor, which is the reference voltage, is maintained constant.

Conclusion
In summary, the LM4132CMF-2.0 voltage reference is a high-precision, wide temperature range voltage reference. It offers tight line and load regulation, tolerance to line transients, and a low temperature coefficient. The LM4132CMF-2.0 is suitable for a variety of applications such as 4-wire sensor measurements, current and voltage regulation, analog to digital converters, medical instruments, and automated test equipment. The LM4132CMF-2.0 operates on a cascode architecture, which combines a regulated current source and a voltage subtractor to achieve a constant output voltage.

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