LR645N5-G

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LR645N5-G Application Field and Working Principle

The LR645N5-G is a linear regulator belonging to the PMIC (Power Management IC) Voltage Regulators category. Its distinctive features make it especially suitable for low power applications. In this article, we will discuss the different applications of this device, as well as the principles of operation and electrical characteristics.

Application

The LR645N5-G is a low-noise, low-power low-dropout (LDO) voltage regulator that is well suited for many applications where linear regulators are preferred. It is a good choice for power regulation in battery-powered consumer electronic devices, especially IoTs like wearable devices, sensors, smart home and more. It has a quiescent current of 5 nA, with a typical output voltage of 3.3V and an output noise of 35μVrms. Moreover, its 1mA output current and wide input voltage range from 2.25V to 6V make it suitable for low-power systems where low noise and low power consumption are key.

Working Principle

The LR645N5-G is a linear voltage regulator that works by controlling the voltage across a variable resistor. This variable resistor is known as the pass element. This resistor is connected between the output of the regulator and its ground terminal, so the current passing through the resistor is proportional to the voltage difference between these two nodes. By controlling the resistance of the pass element, the power pass through the resistor is regulated, hence regulating the output voltage.

The LR645N5-G has an adjustable current-sensing topology, meaning the control loop output is constantly monitored, and the pass element resistance is adjusted accordingly. This allows the device to maintain its output voltage level more accurately even if the input voltage changes.

Electrical Characteristics

The main electrical characteristics of the LR645N5-G are its quiescent current (5nA max), output voltage (3.3V typ), output current (1mA max), and voltage drop (0.1V max). It also has a wide input voltage range (2.25V to 6V) and output noise (35uVrms). In addition, the LR645N5-G has a built-in thermal protection, overvoltage protection, and overcurrent protection, which makes it an ideal solution for low power applications.

Conclusion

The LR645N5-G is a low-power, low-noise linear voltage regulator that is suitable for a wide range of battery-powered applications. Its adjustable current-sensing topology allows it to maintain accuracy even in highly changing input voltage conditions, making it an ideal solution for power-efficient systems. Its electrical characteristics include a quiescent current of 5nA, output voltage of 3.3V, output current of 1mA, voltage drop of 0.1V, input voltage range of 2.25V to 6V and output noise of 35uVrms. In addition, it features thermal, overvoltage and overcurrent protection, which make it highly reliable.

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