AP2138N-1.8TRG1

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AP2138N-1.8TRG1 Application Field and Working Principle

The AP2138N-1.8TRG1 is a high performance, low standby current LDO (low dropout regulator) that provides very low dropout voltage, low temperature coefficient, and low output noise.

The AP2138N-1.8TRG1 has both a fixed output voltage and adjustable output voltage, making it suitable for a wide range of applications. It is ideal for battery operated applications as it has low quiescent current.

The key feature of this LDO is the low dropout voltage performance. It offers very low dropout voltage regardless of input voltage range or output voltage setting. The AP2138N-1.8TRG1 also has a fast transient response and low output noise, making it suitable for applications where noise and reliability are important.

The AP2138N-1.8TRG1 is available in different packages, and the standard package comes with an adjustable current limit of up to 1.8 A and an input voltage range of 5 V to 18 V. The output voltage can be adjusted from 0.6 V to 5 V, and the maximum output current is 0.75 A.

Application Field

The AP2138N-1.8TRG1 is a versatile device and is suitable for a wide range of applications. It can be used for point-of-load regulation, battery-powered applications, distributed power, and industrial process control. Specific applications include voltage regulation for mobile phones, portable GPS devices, digital cameras, LED lighting, etc.

Working Principle

The AP2138N-1.8TRG1 is a type of linear voltage regulator, which is based on the principle of active control. This type of voltage regulator is designed to regulate the voltage level at its output, regardless of the input voltage. It achieves this by controlling the output voltage with a reference voltage, usually set at the factory or optionally adjusted by the user, and by monitoring the difference between the input voltage and the output voltage.

The AP2138N-1.8TRG1 uses a self-regulating feedback loop to adjust the output voltage. This means that it uses the supplied reference voltage to adjust the output voltage in order to maintain the desired level. The feedback loop also contains a comparison circuit that compares the output voltage with the reference voltage and adjusts the output voltage accordingly.

The feedback loop also helps to reduce the dropout voltage by monitoring the output current. When the output current is close to the maximum capacity of the regulator, the regulator uses the installed current limit to reduce the dropout voltage. This reduces the power dissipation and increases efficiency.

Conclusion

The AP2138N-1.8TRG1 is an excellent choice for applications that require high efficiency and low dropout voltage. Its adjustable voltage and current limit, fast transient response, and low output noise make it the perfect choice for point-of-load regulation, battery-operated applications, distributed power, and industrial process control.

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