AN78L05M

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The AN78L05M is a linear voltage regulator that belongs to the PMIC - voltage regulator - linear family. It offers three integrated functions including a 3-terminal low-dropout (LDO) regulator, over-voltage protection, and under-voltage protection. This is a positive direct current (DC) voltage controller and it is highly efficient, reliable and low cost.

Due to its size, the AN78L05M is ideal for portable electronic devices such as tablet PCs, camcorders, and digital cameras, which may have a requirement for three-terminal positive regulating. The output voltage is sourced from the regulator with a regulated minimum dropout voltage of typically 0.2V, which offers the device with a high efficiency rating. A wide input voltage range of 4V to 36V DC allows it to be applied to a variety of applications, including industrial, automotive and telecom equipment.

The working principle of the AN78L05M voltage regulator is simple. The three-terminal positive regulating voltage regulator is designed to provide a regulated output voltage which is constant, relative to the input voltage. It consists of three separate stages: reference, control, and output. The reference voltage is generated by a Zener diode and is used to compare with the output voltage of the regulator. The comparison is then used to turn the pass transistor on and off, allowing the output voltage to be regulated.

The pass transistor then acts as a voltage dropping device, allowing the output voltage to remain constant regardless of changes in the load current. This ensures that the output voltage stays constant and remains within the tolerance range of specified. When over-voltage or under-voltage conditions occur, the regulator shuts off the pass transistor, protecting the system from voltage spikes.

In addition to providing a regulated output voltage, the AN78L05M also offers over-voltage and under-voltage protection by utilizing an over-voltage detection voltage and a voltage sensing pin. The sensing pin monitors the output voltage and shuts off the pass transistor if the input voltage exceeds a predefined threshold. On the other hand, the over-voltage detection voltage disables the regulator if the output voltage rises above a specified level. The device also features an adjustable response threshold voltage to adjust over-voltage protection.

The AN78L05M is an ideal linear voltage regulator for applications such as Industrial Control, Automotive and Telecommunications equipment, Tablet PCs, Camcorders and Digital Cameras. The device offers a highly efficient and reliable solution with very low cost due to its small size. It is also ideal for applications which require three-terminal positive regulating and offers over-voltage and under-voltage protection.

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