L78L08ABZTR

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The L78L08ABZTR is a linear voltage regulator specifically designed to provide over-current and over-voltage protection for low power automotive applications. It is part of STMicroelectronics\' Automotive Off-the-Shelf (AoTS) range of power management integrated circuits (PMICs). The L78L08ABZTR consists of a three-terminal regulator, an internal thermal shut-down circuit and a transient suppression circuit. It is capable of supplying up to 800 mA of output current and is designed to operate over a wide operating temperature range.

Application Fields

The L78L08ABZTR is a versatile, low-power and low-cost linear voltage regulator suitable for use in automotive applications such as on-board diagnostic and entertainment systems, on-board diagnostics systems, cellular phones, and personal computers. Additionally, it is well suited for use in industrial and consumer electronics such as air conditioners, home appliances, LED lighting, and instrumentation equipment.

Working Principle

The L78L08ABZTR operates in a very similar manner to other linear voltage regulators. This type of regulator uses a series-pass transistor that is connected to an adjustable voltage reference voltage. When an input voltage greater than the reference voltage is applied, the series-pass transistor is enabled and current flows from the input through the transistor and out the output. The series-pass transistor is designed so that it is able to regulate the output voltage to a constant level (VREF) regardless of the input voltage variations and load current variations.

The L78L08ABZTR has a number of features to ensure over-voltage and over-current protection. In addition to the series-pass transistor, the L78L08ABZTR has an integrated output current limiter that limits the maximum continuous output current to 800mA. The integrated output current limiter ensures safety in the event of an overload or short circuit at the output. The L78L08ABZTR also includes a thermal shut-down circuit which protects the device from damage in the event of high-temperature operation. The device is also equipped with a transient suppression circuit which limits inrush current and prevents spikes in load current from causing damage to the device.

To maximize efficiency and minimize power losses, the L78L08ABZTR is designed with advanced circuit layout and internal compensation networks that minimize the amount of ripple and unwanted noise. The advanced circuit design also contributes to a low power dissipation, making the device extremely power-efficient.

In summary, the L78L08ABZTR is a versatile and cost-effective three-terminal linear voltage regulator designed to provide 800mA of output current and an over-voltage and over-current protection protection. It is optimized for use in a wide range of automotive and consumer electronic applications, making it an excellent choice for designers who need a reliable and cost-effective power management solution.

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