MC79L15ACP

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The MC79L15ACP is a popular three-terminal negative voltage regulator from STMicroelectronicsTM. It offers a wide range of output voltages, from -1.2 V to -15 V and can source up to 200 mA of output current. By employing a PNP transistor input and output stage, these devices are well-suited to systems requiring extremely low dropout operation and excellent regulation accuracy.

The MC79L15ACP is part of STMicroelectronicsTM’s popular family of linear voltage regulators, designed for applications where low power consumption, simple circuitry and reliability are essential.

Application Fields

The MC79L15ACP is suitable for a wide range of applications in which high levels of accuracy and stability are required. These include power supplies for consumer electronics, various automotive systems, pumps, compressors and other industrial equipment, and medical devices.

The MC79L15ACP is also increasingly being used in consumer applications, such as in white goods, televisions, digital cameras, and portable consumer devices, such as smartphones and tablets.

Design Features

The MC79L15ACP’s key design features include its attractive currents (sharing) capability, low internal power consumption, low dropout voltage, and excellent transient-response performance. In addition, its output voltage accuracy is regularly tested and its on-resistance is measured constantly to ensure consistent quality and functionality.

The device is also backward-compatible with earlier versions of the MC79L15ACP, making it easy to retrofit existing systems and ensuring a smooth transition to the next generation of products.

Working Principle

The MC79L15ACP is a three-terminal negative voltage regulator designed to provide a constant output voltage, typically from -1.2 V to -15 V, at up to 200 mA of current. It is designed to drop the input voltage to a level close to its output voltage; this is known as dropout voltage.

The MC79L15ACP is a PNP-input and PNP-output device. It takes a positive voltage into its input pin and drops it to its required output voltage, producing a negative output voltage. The device consists of an input PNP transistor, a voltage reference, an error amplifier and a series pass transistor.

The voltage reference monitors the output voltage, while the error amplifier compares the reference voltage to the output and sends the difference to the pass transistor to make any necessary corrections. The amount of current supplied by the input voltage to the pass transistor determines the amount of output current; this is known as the load current.

The MC79L15ACP also features overload protection and shutdown capabilities, allowing the user to adjust the voltage at the output pin in order to avoid damage or disruption to the system.

Conclusion

The MC79L15ACP is a popular three-terminal negative voltage regulator from STMicroelectronicsTM that is suitable for a wide range of applications, from consumer electronics to automotive and industrial equipment. It offers a wide range of output voltages, from -1.2 V to -15 V and can source up to 200 mA of output current. It is designed to drop the input voltage to a level close to its output voltage, ensuring excellent regulation accuracy and extremely low dropout operation.

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