MC78M09CDTRKG

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The MC78M09CDTRKG is a linear voltage regulator that belongs to the Power Management Integrated Circuit (PMIC) family. It is designed specifically to generate an adjustable output voltage of up to 9 volts, with an output current of up to 120 mA. This device is suitable for applications in a wide range of products, including portable devices, such as digital media players, mobile phones, digital cameras, and game consoles, as well as various industrial control systems.

This device is a three-terminal regulator that consists of an input terminal, an output terminal, and an adjustable terminal. It functions with an internal voltage reference and an output voltage that is adjustable from 1.24 V to 9 V using two external resistors. The output voltage is adjusted using the adjustable voltage divider comprising the two external resistors connected to the adjustable terminal, hence allowing flexibility and ease of adjustment. Its operating temperature ranges between -40°C and 85°C, making it suitable for use in a wide array of environmental conditions. Additionally, the MC78M09CDTRKG is designed to provide excellent output voltage regulation over a line and load change; hence its output voltage remains stable even when subjected to interrupted supply or large line transients.

The MC78M09CDTRKG device employs a method of voltage regulation known as series pass. This method involves the tandem connection of an NPN transistor amplifier and series pass transistor that is used to regulate the output voltage of the device, depending on the input voltage and the output voltage of the voltage divider. When an input voltage is within the switching threshold of the amplifier, a current of pre-set value, known as the reference current, is generated from the NPN transistor. The collector current of the voltage divider is then compared to the reference current, providing a controlling voltage for the series pass transistor. In this manner, the series pass transistor is used to control the voltage drop across the output load, thereby allowing the output voltage to remain stable, irrespective of small changes in the input or output load current.

In summary, the MC78M09CDTRKG device is a linear voltage regulator designed to provide adjustable output voltage ranging from 1.24 V to 9 V, with an output current of up to 120 mA. This device employs a series pass method of voltage regulation and features excellent stability and reliability. Its operating temperature range between -40°C and 85°C makes it suitable for use in a wide array of portable and industrial control systems.

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