L78L05ACZTR

The L78L05ACZTR is a 5 volt low dropout (LDO) three-terminal positive regulator with a Low Dropout Voltage of 0.2V at 1A current output. The device is part of a series of low drops out voltage regulators that are specifically designed to provide an efficient and robust supply to power sensitive applications. This voltage regulator is commonly used in applications where circuit space is limited but the need for stable voltage is essential. It is also used in power supply systems in telecommunication systems, wireless communications, computing, audio/video systems, industrial electronics, and automotive equipment.The main advantages of this voltage regulator are its small size, low dropout voltage, high efficiency, and wide input voltage range. At the same time, their reverse current protection and short-circuit protection functionality make them highly suitable for high-power applications. The L78L05ACZTR consists of an internal temperature stable Band Gap Reference, an error amplifier, and a PNP pass transistor which act as load. The Three terminals refer to the Input Voltage (VIN), the Output Voltage (VOUT), and Ground (GND). The output of the regulator is regulated by the internal error amplifier through two resistors, R1 and R2, that form a voltage divider. The internal error amplifier maintains the output voltage at a value equal to VREF = 1.24 V.When the output voltage is VOUT, the gate of the load transistor is supplied current through R2. This controls the base current of the load transistor, and as a result, the output voltage is kept constant. The input voltage must be greater than the output and the dropout voltage (VIN - VOUT) for the regulator to operate.The main feature of the regulator is its quiescent current, which is the current consumed by the regulator in normal operation, without the load connected. In other words, it is the current drawn by the regulator when the load is not connected. The quiescent current of the L78L05ACZTR can range from 0.25mA to 2.5mA depending on the output voltage, input voltage, and temperature.The L78L05ACZTR regulator also has a thermal shutdown protection, which activates when the device reaches a certain temperature. This feature is useful to protect the regulator in high temperature and high current applications, where the regulator may otherwise be damaged. In summary, the L78L05ACZTR is a powerful, efficient, and robust voltage regulator, suitable for applications where space is limited and power protection is essential. Its small size and wide input voltage range make it suitable for a range of applications. Furthermore, the thermal protection and quiescent current features ensure that the regulator is reliable and robust.