LM1117IDTX-5.0

Introduction

LM1117IDTX-5.0 is a linear voltage regulator, which belongs to PMIC (Power Management IC). It is a three-terminal device and accepts an input voltage range from 1.8V to 18V. The output of LM1117IDTX-5.0 can be adjusted from 0.6V to 5.0V. It provides current protection and thermal protection, which enables it suitable for many portable applications, such as battery powered mobile devices.

Application Field and Benefits

LM1117IDTX-5.0 is a three-terminal device used for voltage regulation in laptops, USB host devices, digital audio players and cellular phones. The adjustable voltage output makes LM1117IDTX-5.0 useful for applications such as battery charge management, audio amplifiers, or step-down converters. Its wide input range and good line regulation allows it to work well even when there is a large voltage drop on the input.

Moreover, LM1117IDTX-5.0 integrates several features to enhance performance, such as soft-start, current limit protection, and thermal protection, which all help to reduce design and testing time and improve system reliability. The current limit protection prevents overloads and allows the circuit to remain stable even when the output load is out of its specified range. Furthermore, its thermal protection adds protection from heat events. Different from other linear regulators, it keeps the load current constant and allows the IC to cool itself until it reaches stable and normal operation. This ensures the circuits stay operating under extreme conditions.

Working Principle

The LM1117IDTX-5.0 works by using a voltage divider principle. It has an internal bandgap voltage reference, which is used to compare with a voltage applied from the outside. This voltage divides on two external resistors, forming a voltage divider network. By setting the proper resistance values, the voltage drop on the resistors creates a reference voltage, which is then compared to the bandgap voltage reference and used to regulate the output voltage (technically, to adjust the current in the pass element).

In addition, the LM1117IDTX-5.0 also contains an error amplifier, which helps to reduce the output voltage ripple and noise. This is done by comparing the feedback voltage and the bandgap voltage. If the voltage difference increases, the error amplifier will take action and adjust its output signal in order to reduce the voltage difference. This maintains steady output voltage.

Conclusion

All in all, LM1117IDTX-5.0 is a three-terminal device with wide input voltage range and adjustable output voltage. Its protection features and working principle make it suitable for battery powered portable applications, such as digital audio players, USB host devices, laptops and cellular phones. In addition, the error amplifier incorporated inside the IC reduces the output voltage ripple and noise, and improves system reliability.