LM7808 IC Features / Technical Specifications
Features:
- Fixed Output Voltage: The LM7808 provides a stable and accurate 8V output, making it suitable for applications requiring a constant voltage supply.
- TO-220 Package: The IC is available in a TO-220 package, which offers good thermal dissipation and ease of use in various electronic circuits.
- High Output Current: The LM7808 can handle output currents of up to 1.5A, allowing it to power devices and circuits that require higher current levels.
- Short Circuit Shutdown Capability: The IC has built-in protection against short circuit conditions, shutting down the output to protect the IC and connected components from damage.
- Overheat Shutdown Capability: The LM7808 features thermal protection that triggers a shutdown if the internal temperature rises beyond a certain threshold, safeguarding the IC from overheating.
- Low Price: The LM7808 is a cost-effective voltage regulator, making it a popular choice for various projects and commercial applications.
- Reliable for Commercial Use: The IC is designed for reliable performance, making it suitable for commercial and industrial applications that demand stable and consistent voltage regulation.
Technical Specifications:
- Output Voltage: 8V (fixed).
- Input Voltage Range: Typically from 10V to 35V DC. (Note: The absolute maximum voltage might vary among manufacturers.)
- Output Current: Up to 1.5A (the maximum output current the regulator can handle without additional cooling measures).
- Dropout Voltage: Typically around 2V (minimum voltage difference between input and output for proper regulation).
- Quiescent Current (Standby Current): Low standby current of only 8mA, which represents the current consumed by the regulator when operating with no load.
- Line Regulation: The change in output voltage due to changes in the input voltage.
- Load Regulation: The change in output voltage due to changes in the load current.
- Temperature Range: The LM7808 is designed to operate over a specific temperature range, typically from 0°C to 125°C, ensuring reliable performance under varying environmental conditions.
- Efficiency: As a linear regulator, the efficiency of the LM7808 decreases with higher input-output voltage differences. The efficiency is given by (Output Voltage/Input Voltage) * 100%.
- Thermal Resistance: The thermal resistance of the TO-220 package (θJA) is an important parameter that affects the heat dissipation capability of the IC.
- Ripple Rejection: The ability of the regulator to suppress fluctuations in the output voltage caused by input voltage ripples or noise.
LM7808 Description
The LM7808 is a voltage regulator
integrated circuit (IC) that belongs to the LM78xx series. It is designed to
provide a fixed output voltage of 8V, making it suitable for applications that
require a stable and constant 8V supply. As a linear voltage regulator, it
operates by dissipating excess voltage as heat, which might limit its
efficiency in applications with significant voltage drops between the input and
output.
Key Features:
- Fixed Output Voltage: The LM7808 provides a fixed output voltage of 8V, which remains constant as long as the input voltage is within its operating range.
- TO-220 Package: The IC is commonly available in a TO-220 package, which is a three-terminal through-hole package that facilitates easy mounting on a heat sink for improved thermal performance.
- Output Current Capability: The LM7808 can handle output currents of up to 1.5A, allowing it to power devices and circuits that require higher current levels.
- Short Circuit and Overheat Protection: The IC incorporates protection mechanisms to guard against short circuit conditions and overheating. In the event of a short circuit, the regulator will shut down to protect itself and the connected components. Similarly, if the internal temperature rises beyond a safe threshold, the thermal protection circuitry triggers a shutdown to prevent damage.
- Efficiency Considerations: As a linear regulator, the LM7808's efficiency decreases with higher voltage differences between the input and output. This means that the IC may dissipate more power as heat when dealing with larger voltage drops, leading to reduced overall efficiency compared to switching regulators.
- Wide Input Voltage Range: The typical input voltage range for the LM7808 is from 10V to 35V DC. However, it's essential to check the manufacturer's datasheet for the specific version being used.
- Quiescent Current: The IC has a low quiescent current (standby current) of only 8mA, which represents the current consumed by the regulator itself when operating with no load.
Applications:
The LM7808 finds use in a variety of electronic circuits and applications, including but not limited to:
- Powering small electronic devices and circuits that require an 8V supply.
- Voltage regulation for microcontrollers, sensors, and other components in electronic projects.
- Battery charging circuits.
- Voltage stabilization for analog circuits.
Important Note:
While the information provided here is generally accurate, it's crucial to consult the manufacturer's datasheet for the specific version of the LM7808 being used. The datasheet contains detailed information, application notes, and guidelines for proper usage, ensuring the safe and reliable operation of your electronic designs.
Datasheet:
To Download the datasheet just copy and paste the below link in your browser.
https://cdn.datasheetspdf.com/pdf-down/L/M/7/LM78XX_NationalSemiconductor.pdf
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