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UA79M08CKTPR Application Field and Working Principle

The UA79M08CKTPR is part of the Linear Voltage Regulators from the Power Management IC (PMIC) range. It is a five-terminal regulator in a surface mount (SMT) form. This line of products has three functional blocks housed in a very compact package. The line-up boasts of a variety of features for protection of the device, the power supply and the load.

Features and Benefits

• Integrated Circuit: The IC features an internal voltage reference, a controlled output voltage and a dropout voltage; it is equipped with voltage and current sensing devices, such as an over-temperature and over-current protection, a short-circuit protection, and a thermal shutdown switch.
• High Efficiency: The integrated circuit ensures operation in the most efficient way, at very low dropout and quiescent currents.
• Protection Functions: The integrated circuit comes with a slew rate control, a thermal shutdown switch, a short-circuit and an over-current protection.
• Additional Monitor: The IC has two additional monitoring functions that can detect power supply irregularities and enable flexible output voltage ranges.

Applications

The UA79M08CKTPR can be used in a variety of applications, like DC/DC converters, LED drivers, power supplies, telecom equipment and solar controllers. It is also often used in automotive, industrial and medical applications.

Working Principle

The rectified input voltage is applied to the output of the IC. The rectified current flows through the pass transistor, which is typically a NMOS FET. The base voltage of the FET is controlled by the internal voltage reference, which is connected to the output of the IC. If the output voltage becomes too high, the internal voltage reference decreases the current in the pass transistor, thus lowering the output voltage. Conversely, if the output voltage becomes too low, the internal voltage reference increases the current in the pass transistor, thus raising the output voltage.

Summary

The UA79M08CKTPR Linear Voltage Regulator from the Power Management IC range is a five-terminal regulator with a very compact package. It features a variety of features for protection of the device, the power supply and the load. Thanks to its excellent performance and reliability, it is widely used in applications such DC/DC converters, LED drivers, power supplies, telecom equipment and solar controllers. The working principle of the UA79M08CKTPR rests upon a rectified input voltage applied to the output of the IC. The base voltage of the FET is controlled by the internal voltage reference, thus regulating the output voltage.

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