LM431BIM3X

Noise - 0.1Hz to 10Hz:	--
Base Part Number:	LM431
Supplier Device Package:	SOT-23-3
Package / Case:	TO-236-3, SC-59, SOT-23-3
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Current - Cathode:	1mA
Current - Supply:	--
Voltage - Input:	--
Noise - 10Hz to 10kHz:	--
Series:	--
Temperature Coefficient:	50ppm/°C Typical
Tolerance:	±1%
Current - Output:	100mA
Voltage - Output (Max):	37V
Voltage - Output (Min/Fixed):	2.495V
Output Type:	Adjustable
Reference Type:	Shunt
Part Status:	Not For New Designs
Packaging:	Tape & Reel (TR)

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Introduction

The LM431BIM3X is a commonly used PMIC - Voltage Reference. It has a variety of applications and working principles that have made it so popular. This paper will delve into the various application fields and working principles of the LM431BIM3X.

Application Fields

The LM431BIM3X voltage references can be used in different applications. In DC/DC converters, they are used to provide a fixed reference voltage to the converter. This sets the output voltage of the converter at a desired level.In analog circuits, the LM431BIM3X can be used to set a voltage level at which certain components will turn on or off. A reference voltage of 2.5 Volts, for example, could be used to control the current that flows through an LED.Another application for the LM431BIM3X is to provide a reference voltage for instrumentation amplifiers. This reference voltage can be used to properly scale the amplifier’s gain and improve noise immunity.Finally, it can be used in comparator circuits. For example, if you wanted to measure the voltage of a battery, you could use a reference voltage of 4.2 Volts to determine if the battery is full or empty.

Working Principles

The LM431BIM3X operates using a Zener diode as its voltage reference. The Zener diode is a device whose voltage is dependent on the current passing through it.The LM431BIM3X will draw current from an output capacitor to increase the voltage at the output terminal. As the voltage increases, the current passing through the internal Zener diode will also increase. This increase in current causes the voltage at the Zener diode to rise, thus maintaining a steady output voltage.In order to ensure a stable output voltage, the LM431BIM3X has two feedback terminals. One is connected to the output of the IC, and the other is connected to the feedback pin on the Zener diode. As the output voltage rises and falls, the difference between the two feedback terminals is detected and the output voltage is adjusted accordingly.

Conclusion

The LM431BIM3X is a widely used PMIC - Voltage Reference. Its uses vary from DC/DC converters and analog circuits to instrumentation amplifiers and comparator circuits. It operates using a Zener diode and two feedback terminals to ensure a stable output voltage. This paper has explored the various application fields and working principles of the LM431BIM3X.

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