AP2128K-3.9TRG1

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AP2128K-3.9TRG1 is referred to as Linear Voltage Regulator (LVR). It is a type of power management integrated circuit (PMIC) that provides a regulated voltage output from a varying input voltage. The input voltage is provided to the Linear Voltage Regulator through an internal power switch, which is usually a BJT or MOSFET. The internal power switch allows the device to provide a current flow corresponding to the input voltage in order to produce a regulated output voltage.

The AP2128K-3.9TRG1 is designed to operate over a wide range of input voltages, from 7V to 36V DC, with a maximum operating current of up to 300 mA. The output voltage is set to a fixed value of 3.9V at maximum load current, which is regulated by a Voltage Reference (VR) stage with an accuracy of ±2.0%. This allows for precise and accurate regulated output voltages.

The AP2128K-3.9TRG1 can be used in a variety of applications in the telecommunications, office and home electronic equipment, consumer electronics, home appliances, and industrial applications. For example, it can be used to provide regulated voltage for charging and controlling various portable devices such as mobile phones, digital cameras, notebooks and tablets. Moreover, it can be used to provide stable power supply for LED lighting, digital displays (LCD/OLED), and radio-frequency applications.

The working principle of the AP2128K-3.9TRG1 involves the use of an internal power switch (BJT or MOSFET), which is used to control the output voltage. The voltage across the internal power switch is compared to the voltage reference (VR) level by an error amplifier/comparator (EA/CMP), which drives the ON/OFF level of the power switch. When the input voltage is greater than the reference voltage (VR) level, the EA/CMP will turn ON the internal power switch, thus allowing current to flow from the input power source to the output voltage. Conversely, when the input voltage is lower than the reference voltage (VR) level, the EA/CMP will turn OFF the internal power switch and prevent current from flowing from the input power source to the output voltage.

The AP2128K-3.9TRG1 also features a low dropout voltage (LDV) monitor, which is used to indicate a voltage drop in the output voltage due to an increase in the load current. The LDV monitor provides an adjustable hysteresis with a threshold voltage of 1.2V. If the output voltage is lower than the LDV threshold voltage, then the internal power switch is disabled and the device is put into a low power, standby mode. When the output voltage is increased above the 1.2V threshold, the internal power switch is again enabled.

The AP2128K-3.9TRG1 also has current limiting protection, which limits the maximum load current to a pre-set level by turning off the internal power switch. This helps to reduce the risk of damages caused by excessive current draw. Additionally, this regulator also features over-temperature and overload protection, which further helps to ensure that the device is safe from damages caused by excessive temperatures and overloads.

In conclusion, the AP2128K-3.9TRG1 is a linear voltage regulator that is designed to provide a regulated output voltage from a varying input voltage. It features current limiting, adjustable hysteresis, over-temperature and overload protection, making it suitable for a variety of applications including telecommunications, office and home electronic equipment, consumer electronics, home appliances, and industrial applications.

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