L7809CV Pin Connection, Technical Parameters and Features

Ⅰ. What is L7809CV?

L7809CV is a linear voltage regulator with a fixed output voltage and is a type of three-terminal voltage regulator. It uses a series voltage stabilizing circuit with an input voltage range of 11 V to 35V and can output stable voltages of 9V and 1.5A. The device features internal current limiting, thermal shutdown and safe area protection, making it very stable and durable. If paired with adequate heat dissipation, the device can deliver over 1A of output current. Although primarily designed as a fixed voltage regulator, it can also be used with external components to provide adjustable voltage and current. In addition, through the cooperation of external components, L7809CV can also achieve adjustable voltage and current output.

There are two main types of L7809CV three-terminal voltage regulators. One has a fixed output voltage, which is called a fixed output three-terminal voltage regulator; the other has an adjustable output voltage, which is called an adjustable output three-terminal voltage regulator. Their basic principles are the same, and they all use series voltage stabilizing circuits. Because the three-terminal voltage regulator has only three output terminals, it has fewer external components, is easy to operate, has stable performance, and has low cost, so it is widely used.

Replacement and equivalent：

•  KA78M18R

•  L7805CV

•  L78M05CV

•  LM78M06CH

•  MC7809ACTG

Ⅱ. Pin connection of L7809CV

Ⅲ. Technical parameters

Ⅳ. Features of L7809CV

L7809CV is a linear voltage regulator with the following features:

• Its output voltage error is only 2%, with good stability and accuracy;

• Its maximum output current can reach 1.5 A, which can power various electronic devices;

• It is guaranteed over an extended temperature range, allowing it to operate reliably in a variety of environmental conditions;

• It is equipped with a thermal overload protection function that can respond promptly when the equipment overheats to prevent damage to the equipment;

• It has short circuit protection function and output conversion SOA protection, allowing it to be reliably protected in various complex applications.

Ⅴ. Application of L7809CV

L7809CV is a highly integrated power management chip that can provide stable power output for various electronic devices through internal precision voltage and current regulation functions. The biggest advantage of this chip is that it can provide stable output over a very wide load range. This also makes it widely used in various electronic devices.

In addition to being a power management device, the L7809CV also has some circuit protection functions. It has built-in circuit protection mechanisms such as overheating, overcurrent, and safe operating area compensation. These mechanisms can effectively protect the circuits it drives from potential damage such as overload and overheating. Therefore, L7809CV can not only be used as a power management chip, but also ensure the safe and stable operation of the circuit to a certain extent.

At the same time, L7809CV can also achieve adjustable voltage and current output. With the appropriate external components, the user can easily adjust the output voltage and current to meet the needs of a specific application. This flexibility allows the L7809CV to be used in a wider range of applications. Its advantages can be exerted whether in conventional power management applications such as power adapters and chargers, or in some high-end devices that require customized power management solutions.

Ⅵ. L7809CV package

Ⅶ. How to use L7809CV?

First, we need to connect the input voltage to the "Vin" pin of L7809CV. At the same time, we must pay attention to the fact that the input voltage cannot exceed the range specified in the data sheet, which is generally between 11V and 35V.

Next, we need to connect the ground of the input voltage source to the "GND" pin of L7809CV to form a complete circuit loop.

Secondly, we need to connect the "Vout" pin of the L7809CV to a circuit or device that requires 9 volt power. It is recommended to place a decoupling capacitor (typically 0.1μF) between the "Vin" and "GND" pins and between the "Vout" and "GND" pins of the L7809CV. These capacitors help stabilize the regulator's output and reduce noise.

Before proceeding to the next step, we need to confirm whether the heat generated by L7809CV is within the acceptable range. If the temperature is too high, you will need to consider adding a heat sink to the regulator to ensure proper operation.

Finally, we energize the circuit. We should regulate the output voltage of L7809CV to a stable 9 volts. After the adjustment is completed, we need to measure whether the output voltage is within the required range.