L78L33ACZ

PMIC - Voltage Regulators - Linear

The L78L33ACZ is a positive voltage regulator which employ internal current and thermal limit, thus providing a very high level of protection from overloads. It operates within an input voltage range of 3 to 40V, and has an output voltage of 5V with a maximum output current of 500mA. This device guarantees output voltage accuracy up to 1%, and a low dropout voltage of only 1.2V. In addition, the L78L33ACZ provides both over current and thermal protection with logic based circuit, which helps prevent excessive dissipation of the device.

Application Field

Due to its superb accuracy rating and overloading protection, the L78L33ACZ is most commonly used in a variety of fields such as automotive, audio and video Applications, embedded industrial systems, gaming consoles and general low power applications. This device is suitable for both SMD and PCB mounting, and allows for easy integration into any system.

Working Principle

The main principle behind the L78L33ACZ is that it uses an internal operational amplifier in series with a resistor which controls the amount of current flowing into the output terminal. This operational amplifier acts as a current shunt, which constantly monitors the voltage of the output terminal and adjusts the resistance in the path to regulate the output. When the output voltage rises above the desired level, the operational amplifier decreases the resistance in the current path, thus reducing the output voltage. Likewise, when the output voltage falls, the operational amplifier will then increase the resistance in the current path, resulting in an increase of the output voltage. This ensures that the output voltage is always maintained at a specific value, providing the most efficient voltage regulation across a wide range of environmental and operational conditions.

Summary

The L78L33ACZ is a positive voltage regulator which is most commonly used for automotive, audio and video applications, embedded industrial systems, gaming consoles, and low power applications. It operates within a wide input voltage range of 3 to 40V, and provides output voltage accuracy up to 1%. In addition, this device provides both over current and thermal protection with logic based circuit, which helps prevent excessive dissipation of the device. The working principle behind this device is based on a series-connected operational amplifier with a resistor which constantly monitors the output voltage and adjusts the resistance accordingly. This ensures an efficient voltage regulation across a wide range of environmental and operational conditions.