AP2128K-4.2TRG1

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The AP2128K-4.2TRG1 is a three-terminal adjustable linear regulator. This high reliability low dropout (LDO) voltage regulator provides a regulated output voltage with an input voltage range up to 28V and a maximum output current capability of 2A. It offers excellent load and line regulation, low output noise and ripple, as well as low quiescent current and low temperature coefficient. The "enable" function offers remote load timing control and the current limitation feature provides necessary protection to the load. The AP2128K-4.2TRG1 is the perfect choice for use in battery-powered applications, automotive applications and general supply purposes that require wide input voltage range and low dropout voltage.

The AP2128K-4.2TRG1 is available in SOT23-5, SOT23-6 and SOT89-3 packages, making it suitable for use in portable equipment and space limited applications. The external resistors are used to adjust the output voltage from 1.2V to 23V with an accuracy of +/-1.5%. This voltage regulator has excellent load regulation and low noise and ripple, making it an ideal choice for high performance applications.

In terms of its main features, the AP2128K-4.2TRG1 has a low dropout voltage of 0.2V at 1A load, maximum output current of up to 2A, fast transient response time of 0.5µs, wide temperature range of -40°C to 125°C and ultra-low quiescent current of typically 350µA. In addition, the current limit function provides protection against output overload, while the enable function offers remote load timing control. Also, the AP2128K-4.2TRG1 provides over temperature protection, reverse current protection and over voltage protection.

The working principle of the AP2128K-4.2TRG1 is quite straightforward. The device has two inputs: an enable (EN) pin and an adjustable feedback (FB) pin. When the device is enabled, the voltage at the FB pin is compared to a reference voltage, typically 1.22V. The voltage difference between the two pin is then amplified and used to control the output voltage. The amplified current determines the amount of current that flows through the transistor, which in turn regulates the output voltage. The output voltage is regulated to a value that is the sum of the reference voltage and the amplified voltage difference.

The AP2128K-4.2TRG1 is an ideal choice for battery-powered applications such as handheld devices, personal digital assistants and digital cameras. It\'s also suitable for automotive applications such as backlight dimming and power supplies. Due to its low dropout voltage, it can provide an accurate output voltage even if the input voltage changes considerably. The excellent load regulation, low noise and ripple and ultra-low quiescent current make the AP2128K-4.2TRG1 an excellent choice for high performance applications.

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