TL431AIDBZR,215

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TL431AIDBZR,215, a voltage reference with programmable output voltage and laser trimmed accuracy, is one of the most popular voltage references from Texas Instruments. This device found popularity in the PMIC (Power Management Integrated Circuit) market. A voltage reference provides a stable and precise reference source, which is used as a point of comparison in various feedback loops in power systems.

TL431AIDBZR,215 is a 3-terminal programmable regulator that can output 0.2V to 36V with a minimum of 0.02% accuracy. The external programmable resistance could help to adjust the output voltage by 1.25mV each step. It is ideal for PMIC applications that need a precise, stable reference such as voltage monitoring and regulation, over-voltage protection, and current limit settings. But it also has other applications in power management, test and measurement, medical, automotive and industrial.

The device has a wide operating temperature range from -40°C to +125°C with a peak current capability of 100mA. The low quiescent current of 1.5mA allows designers to choose this device for energy sensitive applications. The sensing window voltage is 1.24V ±0.04V, which provides the user with the ability to increase or decrease the reference voltage.

The programming of the TL431AIDBZR,215 can be done via rectifier-type voltage divider, which is connected to the Adjust (ADJ) pin of the device. Usually a 10KΩ and 5KΩ resistor in series acts as the voltage divider and the output voltage is set at (1.235) × (VADJ/R1).

At its core, the device employs a fixed voltage reference from Zener diode, trimmed bandgap reference, and a temperature compensation network with error amplifier, pass transistor and three resistors.

The error amplifier further amplifies the difference between the reference voltage and the output of the pass transistor. When the input voltage is greater than the voltage set by the voltage divider, the error amplifier increases the reference voltage at its output. This allows the output voltage to be regulated at the programmed level. Similarly, when the input voltage is lower than the reference voltage, the error amplifier causes the output voltage to decrease.

One of the major features of the TL431AIDBZR,215 is its current limiting feature. It consists of an internal current limit circuit coupled with the internal voltage reference. The current limit is set by the ratio of R2 and R3, which is adjustable from 0.2 to 20mA.

In conclusion, the TL431AIDBZR,215 is an excellent choice for those looking for precise and stable voltage reference for PMIC applications with low quiescent current and wide temperature range. Its programming capability through external resistor divider, its current limiting feature, and its trimming accuracy of 0.02% make it superior to other devices in the market.

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