AN78L12ME1

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AN78L12ME1 is a low-dropout linear voltage regulator from STMicroelectronics. It is an ideal device for providing a stable voltage to any electrical equipment by buffering the supply voltage and offering precise voltage regulation for low and medium power applications. AN78L12ME1 provides adjustable output voltage through external resistors and it includes reverse current, short-circuit and over-current protection. The maximum output current is 300mA and the device comes in an SOT-89 package, enabling it to be easily placed in any industrial and consumer product.

The key features of AN78L12ME1 include low noise, low input voltage, high efficiency, low thermal resistance and reverse current protection. Its low dropout voltage, at about 0.4V, makes it suitable for applications that require a higher current than standard linear regulators can offer. The 0.1µF bypass capacitor helps reduce ripples, making the output more stable. The low voltage dropout of AN78L12ME1 expands its application field and makes it suitable for low input power, low power consumption and high efficiency.

The working principle of AN78L12ME1 is based on the use of two transistors connected in series. The two transistors function as a resistor in series with a diode to provide current limiting protection. On the other hand, the output voltage of the regulator is set by a voltage divider connected to the output terminal of the device. An internal Zener, or reference, diode ensures that the output voltage is constantly maintained regardless of the load current or input voltage.

The AN78L12ME1 is suitable for a wide range of applications in industrial, medical and consumer equipment, including personal computers, cellular phones, global positioning systems, automotive equipment, and video conferencing systems. It is also suitable for any application demanding low-noise and low-dropout voltage regulation. It can be used as a replacement for a discrete voltage regulator in many circuits.

In summary, the AN78L12ME1 is a low-dropout linear voltage regulator from STMicroelectronics that provides adjustable output voltage through external resistors and includes reverse current, short-circuit and over-current protection. Its low voltage dropout expands its application field, making it suitable for a wide range of industrial, medical and consumer applications. The device operates based on two transistors connected in series and an internal Zener diode to ensure constant output voltage regardless of the load current or input voltage.

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