AP1117E50G-U

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AP1117E50G-U is one of the most commonly used linear voltage regulator devices in the market. It belongs to the PMIC (Power Management IC) voltage regulator family and performs power regulation tasks through linear regulation. AP1117E50G-U is a low-dropout (LDO) regulator with a built-in feedback resistor, providing better output performance while reducing external component count. It has an operating voltage range from 1.2V to 5.5V, with an output current up to 350mA and an adjustable output voltage range from 1.25V to 4.75V.

AP1117E50G-U’s application field is quite broad. It is mainly used in various portable and battery-powered devices, such as cellphones, digital cameras, PDAs, and portable media players, due to its low quiescent current and low voltage drop. Additionally, it is widely applied to various audio equipment, optical modules, and recording systems.

AP1117E50G-U features high output accuracy, allowing the output voltage to be stabilized to within ±2.5%. Its built-in thermal limiter and current limiter, allows it to be operated safely in various medium-power applications. It is a three-terminal device with their pinouts designated as VIN, GND and VOUT.

The Working Principle

The working principle of AP1117E50G-U can be divided into two parts: voltage regulation and over-current protection.

The primary purpose of AP1117E50G-U is voltage regulation, which is done by controlling the amount of current that passes through the device. The input voltage is fed into the device and converted into constant current through the built-in feedback network. This current is further controlled by the PWM (pulse-width modulation) circuit and constant current regulator to keep the output voltage stable.

For over-current protection, the device is equipped with an over-current protection circuit, which is a combination of an over-current detector and an over-current limiter. The limiter will cut off the current when it exceeds the rated range. And the detected writes a high impedance state into the output port.

The working of AP1117E50G-U can be summarized as follows: first, the input voltage is regulated through the built-in feedback network and the PWM circuit; second, the output is monitored using the over-current detector and the over-current limiter; finally, the output voltage is adjusted and maintained as a constant value.

Features

The key features of AP1117E50G-U are high efficient and low quiescent current, adjustable output voltage, three-terminal voltage regulator with feedback resistor, and built-in thermal limiter and current limiter.

Its high efficiency allows it to regulate output voltage with relatively low energy loss, while its low quiescent current reduces power dissipation when the device is not in use.

The adjustable output voltage allows AP1117E50G-U to adapt to various power requirements and provides better output stability.

The three-terminal voltage regulator with its built-in feedback resistor simplifies the circuitry and improves output performance.

The built-in thermal limiter and current limiter protect the device from damage due to current and temperature overload, providing a safer and more reliable working environment.

Conclusion

AP1117E50G-U is a low-dropout linear voltage regulator for medium-power applications with high output accuracy and low quiescent current consumption, adjustable output voltage and built-in thermal limiter and current limiter, making it suitable for all sorts of portable and battery-powered devices.

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