L79L05ACD13TR

The L79L05ACD13TR is a linear voltage regulator produced by STMicroelectronics. It is a low drop-out (LDO) two-terminal device specifically designed for Automotive applications as it supports a wide operating temperature range from -40 to +125 degrees Celsius (-40 to +257 degrees Fahrenheit). The L79L05ACD13TR has a LOW IQ (8µA) and an OUTPUT current up to 100mA and can be used as an ideal replacement for 3-Terminal Regulators in applications where high current supply with low quiescent current is required.

Application Fields of the L79L05ACD13TR

The L79L05ACD13TR is mainly used in automotive applications such as Lighting, Cooling Fans, Infotainment, and Battery Management Systems. In lighting applications, the L79L05ACD13TR can be used to provide a stable power supply for the RGB LEDs used in ambient lighting and Headlamp systems. The device is ideal for the automotive environment as it has an operating temperature range from -40 to +125 degrees Celsius, making it suitable for long-term operation in the most extreme conditions. The low quiescent current makes it an ideal choice for battery-operated applications, as it can help extend battery life.

Moreover, the L79L05ACD13TR is also an ideal regulator for cooling fans, infotainment systems, and battery management systems. In cooling fan applications, the L79L05ACD13TR can be used to provide the correct and stable operating voltage to the fan motor, ensuring consistent and efficient operation. In infotainment systems, it can be used to provide the stable supply voltage for rear-camera systems, audio and visual navigation systems, and other such in-vehicle systems. Additionally, the device can be used to provide a stable voltage source for battery management systems, providing the correct amount of current to each cell and thus helping to ensure maximum battery life.

Working Principle of the L79L05ACD13TR

The L79L05ACD13TR is a linear voltage regulator, meaning that its main function is to convert an input voltage (Vin) to a perfectly stable output voltage (Vout). This is done by way of a voltage divider circuit, which creates the stable Vout from the unstable Vin. A resistance on the ground connection (called a feedback resistor) acts as a buffer to maintain the output voltage within a predetermined range. The voltage is controlled by the voltage divider network and the feedback resistor.

The L79L05ACD13TR consists of two main components – an internal PMOSFET and a voltage reference. The PMOSFET is connected between the input and output, and acts as a switch to control the output voltage. It has a threshold voltage of 530 mV, meaning that it is only activated when the input voltage is above 530 mV. The voltage reference provides a stable voltage to the feedback resistor. This voltage is compared to the output voltage and any difference is corrected by the PMOSFET.

When the input voltage is below the threshold voltage, the device is in a low power state and the voltage drop across the PMOSFET will be low, resulting in a high current being available at the output. When the input voltage exceeds the threshold voltage, the voltage drop across the PMOSFET will increase, resulting in a reduced current at the output. In this way, the L79L05ACD13TR can provide a precisely regulated output voltage, even when the input voltage varies.

Conclusion

The L79L05ACD13TR is a low drop-out two-terminal device specifically designed for automotive applications. It has a wide operating temperature range, making it suitable for long-term operation in even the most extreme conditions. In addition, it has a low quiescent current, making it an ideal choice for battery operated applications. The L79L05ACD13TR is mainly used in automotive applications such as Lighting, Cooling Fans, Infotainment and Battery Management Systems. The device works on a linear voltage regulator principle, using the PMOSFET to control a voltage reference for a stable output voltage.

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