AN78L12

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PMIC - Voltage Regulators - Linear

The AN78L12 is a three terminal positive linear voltage regulator integrated circuit with built-in current-limiting, thermal-overload protection and short-circuit safe-operating area protection. With a wide range of output voltage options and internal current limiting, this versatile IC is able to provide a stable, low noise output voltage for a variety of applications. The AN78L12 is housed in a TO-263-2L (D2PAK) package, featuring a low power consumption of 2mA and a maximum output current of 2A.

Applications

The AN78L12 is well suited for a variety of applications including cellular phones, PDAs, networking equipment, battery-powered equipment,mp3 players, and portable audio equipment. The IC is typically used in power-supply designs that require a well-regulated output voltage with no-load start-up, noise reduction, and stability over line and load changes. As this low voltage regulator is also very versatile, it has many general-purpose uses. For example, it can be used with a resistor divider to provide a stable reference output.

Working Principle

The AN78L12 is a three-terminal voltage-regulator IC, with the input terminal (pin 1), the output terminal (pin 2) and the ground terminal (pin 3). As a positive linear regulator, the basic function of the AN78L12 is to regulate voltage between its output terminal and ground terminal, within a specified tolerance, regardless of the load it is powering or the input voltage. This regulation is achieved by comparing the input and output voltages, and using an internal PNP pass transistor to provide a path for the current flow. The internal pass transistor, plus a series of protection circuits, form a closed loop control circuit, thus allowing the voltage regulation to remain within the specified maximum and minimum but without drawing too much current from the input terminal, thus providing low power dissipation.

The AN78L12 is programmed to turn-on and maintain the output voltage with a minimum number of external components, by using its internal current limiting and thermal-overload protection circuits. The output voltage is preset by the resistance of an external resistor divider connected to ground. When the output voltage is greater than the programmed voltage, then, the internal current regulation circuit limits the output current going through the pass transistor.

Conclusion

The AN78L12 is a three terminal positive linear regulator integrated circuit designed to provide a stable, low noise output voltage and built-in current limitation, short-circuit protection, and thermal-overload protection. This widely used IC is well-suited for a variety of applications, including cell phones and other electronic devices, with its output voltage programmed by a resistor divider connected to ground. With its wide range of output voltage, low power consumption, and solid protection features, the AN78L12 is a reliable and versatile choice for linear voltage regulation.

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