AN78L18

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The AN78L18 is a low power, linear voltage regulator from Analog Devices. It is a 3-terminal adjustable device that provides a constant output voltage, the stability of which is maintained over the entire range of currents up to the rated power dissipation. The device is well suited for a wide range of applications where a constant and stable output voltage is required. Some of the key features and specifications of the AN78L18 are provided below.

Applications

• Battery-powered systems
• Computer systems
• Portable devices
• Telecommunications systems
• Medical devices
• Automotive systems

Key Features

• Low voltage operation
• Low dropout voltage
• High power output
• High ripple rejection ratio
• Soft-start capability
• Low-noise operation
• High slew rate

Specifications

• Input voltage range: 1.6V to 18V
• Output voltage range: 1.8V to 15V
• Output current: 800mA (typical)
• Dropout voltage: 350mV (typical)
• Ripple rejection: 80dB (typical)
• Load regulation: 0.5% (typical)
• Operating temperature: -40°C to +85°C

Working Principle

The AN78L18 is a three terminal adjustable linear voltage regulator. It consists of an N-channel MOSFET pass element, series pass transistor and current sense resistor. The device operates by controlling the voltage across the MOSFET pass element. The MOSFET pass transistor operates in its linear region and acts as a variable resistor to provide the voltage regulation. The device is designed to regulate a variety of input and output voltages and is capable of providing a constant current output into a load. It is capable of providing up to 800mA of output current at a dropout voltage of 350mV. The current sense resistor helps to limit the output current and provides protection against over-current conditions. It also provides current limiting and soft-start functions.The device can be programmed to have a wide range of output voltages, from 1.8V to 15V, with the use of an external voltage divider network.

In summary, the AN78L18 is a 3-terminal adjustable linear voltage regulator designed for a wide range of applications. It is capable of providing a stable and constant output voltage with a high ripple rejection ratio, a low dropout voltage, and a high power output. The device is also low-noise and features a soft-start capability.

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