LMV431AIMFX Integrated Circuits (ICs)

LMV431AIMFX Application Field and Working Principle

The LMV431AIMFX is part of Texas Instruments Voltage Reference product line, which is a low-power, low-dropout two-terminal voltage reference. It is commonly used in precision applications in industrial, automotive and portable electronic applications. This product has incredibly low operating current, low input/output offset voltage and low drift over temperature.

Application Field

The LMV431AIMFX voltage reference comes in two packages, the 5-pin SOT-23 and the 6-pin SC-70 packages. Its two-terminal architecture makes this device suitable for applications where an isolated adjustment of the output voltage is needed. The typical applications include:

• Data Converters
• Battery Management
• Process Control
• Industrial Control
• Portable Electronics
• Automotive Electronics
• Motor Control

Working Principle

The LMV431AIMFX voltage reference consists of an adjustable reference source, a differential amplifier, and a compensating network. The adjustable reference source is made up of two transistor-level circuits that are connected between the two inputs of the differential amplifier. The voltage drops across the two transistors are directly proportional to the current which flows through the resistors between each of them. The output voltage of the device is directly related to the current changing the resistance of the circuit. The compensating network is there to minimize the effects of noise, temperature and other environmental factors on the voltage reference.When the device is powered on, the LMV431AIMFX voltage reference goes through a startup routine. During this process, the differential amplifier is connected to a fixed reference voltage. This reference voltage adjusts the voltage reference output level according to the sink current and the temperature. The output voltage of the device can be adjusted, by changing the reference voltage.

Conclusion

The LMV431AIMFX is a low-power, low-dropout two-terminal voltage reference. It is a versatile device with numerous applications in several industries. Its two-terminal architecture makes it suitable for applications where an isolated adjustment of the output voltage is needed. The device is powered on through a startup routine and its output voltage can be adjusted by changing the reference voltage.