LM431CCZ

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LM431CCZ is an adjustable shunt voltage reference with built-in thermal protection. It is part of the product family of Voltage Reference PMIC, which provides a stable output voltage with very low offset and temperature drift.

The LM431CCZ has an integrated 1.2V bandgap reference, temperature compensation circuit and a differential amplifier. It is available in the SOT-23-5, SOT-23-6, TO-92 and SC-70 packages.

The LM431CCZ provides an output voltage which is adjustable over a ±10% range by applying an external voltage through external divider network. The junction temperature range of the device is -40°C to 125°C.

Working Principle

The LM431CCZ is a precision voltage reference based upon a bandgap reference. The core of the IC is a shunt voltage regulator, that works in combination with an external resistor divider. The IC has a 3-terminal design, with an output, ground, and an internal reference.

The internal refernece is the bandgap reference circuit, which provides a highly stable voltage source. This voltage source is then used to drive the error amplifier, which is the control element that adjusts the output voltage. The error amplifier makes adjustments to the output voltage by controlling the charging current to the output capacitor. The external resistor divider maintains the output voltage steady and is adjusted to the desired level by connecting to two external resistors.

The output voltage developed across the resistor divider is compared to the internal reference voltage of the IC and the error amplifier regulates the output voltage by controlling the charging current to the output capacitor. The capacitor not only stabilizes the output voltage but it also stores the charge and serves as a buffer for driving the load. The output voltage is adjusted over a ±10% range, by changing the inputs of the resistor divider.

The LM431CCZ also has an overriding positive temperature coefficient (PTC) thermal protection circuit to protect the IC from excessive junction temperatures. It monitors the junction temperature and increases the output voltage in case of excessive heating. This ensures that the output voltage is maintained in the specified range, even under extreme conditions.

Applications

The LM431CCZ is widely used in battery-powered portable equipment and industrial applications. It has a wide range of medical equipment applications such as EEG, ECG, and EKG. Moreover, it is used in sensor applications such as temperature, pressure, current, and strain. It is also used in automotive applications such as car audio systems, powertrains and infotainment. Additionally, the device finds application in industrial and communication products.

The LM431CCZ is a versatile low power, precision voltage reference IC with a wide operating temperature range and adjustable output voltage. It can be used across a wide range of applications such as medical equipment, automotive, industrial, and communication products. Furthermore, its positive temperature coefficient ensures stable operation in extreme temperature conditions. This makes the LM431CCZ a preferred choice for precision voltage reference applications.

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