AP2128K-2.8TRG1

PMIC - Voltage Regulators - Linear - AP2128K-2.8TRG1 application field and working principle

The AP2128K-2.8TRG1 is part of the AP2128K series of low-voltage linear regulators manufactured by Anpec Electronics Corporation. The AP2128K series of low-voltage linear regulators are designed specifically for use in portable electronics. They are designed to provide a constant voltage output under varying input voltage conditions.

Features

The AP2128K-2.8TRG1 features a wide output voltage range of 1.2 to 5.5V, a 600mA output current capability, low quiescent current (< 20μA) and low dropout voltage. In addition, the device has a temperature range from -40°C to +85°C, a load regulation of 0.2%, and a current limit of 1.2A. The AP2128K-2.8TRG1 also has an overvoltage protection of 4.4V and a thermal shutdown protection of 140°C.

Applications

The AP2128K-2.8TRG1 is suitable for a variety of applications, including 5V/3.3V to 5V, MP3/MP4 players, PDA/mobile phones, DC-DC converters, and USB devices, as well as DC-DC and AC-DC power supplies.

Working Principle

The AP2128K-2.8TRG1 is designed to regulate the output voltage at a constant level in the presence of an input voltage that changes. The device utilizes a voltage reference and an operational amplifier to set the output voltage. When the output voltage differs from the reference voltage, the operational amplifier adjusts the output voltage of the device until the output voltage and the reference voltage are equal. For example, when the output voltage is below the reference voltage, the operational amplifier will increase the output voltage.

The AP2128K-2.8TRG1 is equipped with two external resistors, one for setting the output voltage and the other for setting the current limit. The output voltage can be set by connecting the external resistors to either the output voltage (VOUT) or ground (GND) as desired. The current limit can also be set by adjusting the value of the external current limit resistor.

Conclusion

In conclusion, the AP2128K-2.8TRG1 is a low-voltage linear regulator designed specifically for portable electronics applications. It features a wide output voltage range of 1.2 to 5.5V and a low quiescent current, making it ideal for applications requiring a low-power solution. In addition, it features over-voltage protection and thermal shutdown protection, as well as a current limit function.