L7808CP

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L7808CP Application Field and Working Principle

The L7808CP is a 3-terminal positive voltage regular from STMicroelectronics that provides a regulated output voltage. It belongs to the PMIC (Power Management Integrated Circuit) family of products, and is classified under the voltage regulator subcategory of linear regulators.

Features and Benefits

The chip features an output voltage of 8v (±1.5%), a maximum output current of 1A, a quiescent current of 10mA and a maximum noise of 1mVrms. It also has an internal thermal shutdown which reduces the risk of overheating, and a minimum load current of 10mA.

The chip has a wide variety of applications, most notably in low to moderate power applications such as desktop computers, laptop computers, and small embedded devices. The tight voltage regulation, small footprint, and low quiescent current make it well-suited to these systems.

Working Principle

The L7808CP works on the principle of series regulation. It has an internal pass transistor that is connected in series with an adjustable voltage divider. This allows the output voltage to be adjusted to a precise level by varying the divider’s ratio. The transistor acts as a current limiter, ensuring that the output current does not exceed the preset level.

The output voltage is further regulated by the internally integrated feedback loop. The loop is constantly monitoring the output voltage, and offers feedback that is used to adjust the voltage divider and the pass transistor’s current, maintaining a stable output voltage.

Conclusion

The L7808CP is an efficient and reliable 3-terminal linear voltage regulator. It offers precise control of output voltage, a wide range of applications, and an internal thermal shutdown for protection from overheating. It is ideal for applications where low to moderate power output is required.

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