TLV431CDBVT

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The TLV431CDBVT is a voltage reference device, classified under power management integrated circuits (PMIC) - Voltage Reference. It is a three-terminal adjustable shunt regulator that provides a precision reference voltage with excellent temperature stability on a very small size of surface mount package. The device uses a fraction of power along with tiny physical area, thus providing overall low power consumption.

The device operates with an output voltage range between 2.5V to 36V and requires a minimum current between 0.1µA and 20mA. Its temperature stability is 0.25mV/°C which gives it sufficient accuracy and stability over temperature. It also has a low output noise feature of 1mVp-p and is designed to work over a temperature range of -40°C to +125°C. The device is specifically designed to be used for a range of industrial, consumer and automotive applications.

Working Principle of TLV431CDBVT

The TLV431CDBVT works with the help of a reverse breakdown characteristic of a zener diode and three different currents, which are internally generated. The output voltage is regulated and determined by the ratio of these three currents. The device draws a current to the reference diode, an adjustable current source, and a bias current source. These three currents refer to the currents drawn to ground through R1, R2 and R3, respectively.

The output reference voltage is regulated by the ratio between these three currents. If a greater current flows through R1, the output reference voltage increases and vice versa. The output reference voltage is given by the following equation: VOUT = (−1.2V *I2) + (0.4V * I3) + 2.5VI1 = (VOUT - 2.5V) / (−1.2V)

The output reference voltage is kept constant by the Internal Reference/ Error Amplifier, which controls the current sources connected in the circuit. This ensures that the output voltage remains accurate over temperature. The device also contains two additional features, namely the Shutdown and Trim features, which can be used to save power and adjust the voltage to the exact value required.

Applications of TLV431CDBVT

TLV431CDBVT has various applications in industrial, consumer and automotive system. Some common applications for the TLV431CDBVT are:

• Voltage regulator applications
• Flash memory systems
• Voltage reference for systems with analog-to-digital converters
• Temperature sensing systems
• Industrial process control systems

The device is also used in device data converters, such as voltage-to-frequency and voltage-to-pulse width converters, as well as in digital–to-analog and analog–to-digital converters. In portable devices, such as cell phones, laptop computers and PDAs, TLV431CDBVT is used to regulate and monitor the battery voltage. It is also used in medical equipment, such as heart rate monitors, blood pressure monitors and hand-held ECG monitors.

TLV431CDBVT is a low-cost solution for applications that require a low noise, high accuracy and reliable voltage reference. It has high current capability, which makes it suitable for switched mode power supply design. It is designed for easy adjustment and is a very useful device in electronic system design.

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