KA79M05TU

KA79M05TU is a linear voltage regulator integrated circuit that is commonly used as an inexpensive and low-dropout (LDO) voltage regulator in appliances and other electronic applications. It is typically used to power low-current microcontroller applications, such as providing battery management and local powering of a Microcontroller Unit (MCU).

Application Field of KA79M05TU

KA79M05TU is a great option for microcontroller applications because of its low quiescent current of only 5.5 µA. This makes it extremely suitable for applications where power conservation is important, such as battery-powered or mobile applications. It is also a suitable choice for audio-related applications due to its low noise output voltage and ripple rejection capabilities.

In addition to its versatility, KA79M05TU can be used to supply 3.3V or 5V to the MCU via I2C bus control, providing a total output current capability of up to 100mA. This makes it an ideal option for applications that require reliable, isolated, and low-voltage power supply.

Working Principle of KA79M05TU

KA79M05TU is a low dropout linear voltage regulator, which means that it provides a constant output voltage of 3.3V or 5V over a wide range of input voltages, typically between 4.5 V and 24 V. It has a total quiescent current of < 5.5 µA and a very low dropout voltage of 0.2 V. KA79M05TU uses an internal feedback loop to adjust automatically the output voltage to the preset value of 3.3V or 5V.

When the MCU’s I2C-bus is in the active state, the KA79M05TU starts working by setting the voltage at the output to the 3.3 V or 5 V preset level. Whenever the output current varies, the device automatically adjusts the output voltage to maintain the preset voltage. The output voltage is further regulated by the on-chip reference and compensation network.

The KA79M05TU provides high accuracy at both minimum and maximum output currents. Its minimum output voltage accuracy is within 2%, and its load regulation is better than 0.2%. It also provides an internal thermal shutdown circuit that keeps the output voltage relatively constant even if the device temperature rises above its normal range.

Conclusion

In conclusion, KA79M05TU is a versatile, low-power linear voltage regulator that is suitable for a variety of applications, including MCU power management, audio-related applications, and mobile appliances. It offers a low dropout voltage of 0.2 V and a total quiescent current of 5.5 µA, while providing a preset output voltage of 3.3 V or 5 V. It also features excellent load regulation and output voltage accuracy, making it an excellent choice for a variety of applications.