LM431BIM3X/NOPB Integrated Circuits (ICs)

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The LM431BIM3/NOPB is a precision adjustable shunt regulator that can be used as a precision voltage reference. This device belongs to a family of precision reference voltage sources, known as PMIC (Power Management/Integrated Circuit).

The LM431BIM3/NOPB can be used in a variety of applications like programmable precision reference and power supply control, voltage regulation, ground-referenced signal performance, and calibration of sensor circuitry. Typical applications include providing adjustable reference voltages over the range 0.1V to 36V and thus controlling power supply voltages, precision pre-set and voltage-clamp circuits.

The LM431BIM3/NOPB is suitable for both commercial (0°C to 70°C) and industrial (-40°C to 85°C) temperature ranges. Its output voltage is adjustable over a wide range, with a guaranteed positive temperature coefficient (TC) of 3 mV/°C, and a load regulation of 10 ppm/V. It features a low output impedance, high power dissipation capability, and a turn-on voltage of 1.3V max. The LM431BIM3/NOPB is available in a 3-pin TO-92 package.

The LM431BIM3/NOPB operates on the principle of a voltage-controlled series current source. Generally, it works by comparing an internal reference voltage to the voltage on the adjustable terminal and by regulating the current that flows through the series reference divider and the internal resistor. By controlling the current through the internal resistor, the output voltage is thereby regulated.

When the adjustable pin is tied to the reference, the output voltage is the same as the reference voltage. As the adjustable pin is pulled further away from the reference, the output voltage becomes higher. This is because the current that flows through the divider increases, which increases the voltage across the internal resistor and thus increases the output voltage.

The LM431BIM3/NOPB has a very accurate reference voltage of 4.3V, and an output current limit of 30 mA. It also provides excellent temperature stability of 0.3 mV/°C and has a selectable power-down function.

In summary, the LM431BIM3/NOPB is a PMIC that can be used in a variety of applications as a precision adjustable shunt regulator. By controlling the current through the internal resistor, it can provide adjustable reference voltages over the range 0.1V to 36V. It features a low output impedance, high power dissipation capability, excellent temperature stability and a turn-on voltage of 1.3V max.

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