AP139-28WL-7

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AP139-28WL-7 is a positive voltage regulator of the PMIC (Power Management Integrated Circuit) family that is used in various electronic circuits and systems. The PMICs function is to convert a higher voltage (AC or DC) to a lower voltage (DC). They are available in a variety of shapes and sizes depending on the application, ranging from linear voltage regulators to switching regulators. This particular voltage regulator is a linear type, which provides a stable output voltage based on a voltage-divider feedback loop.

The AP139-28WL-7 offers features such as 5V output voltage and 0.8A output current with a maximum dropout voltage of 1.5V. It also supports adjustable output voltage via a single external resistor. Other features include thermal shutdown, wide input voltage range, undervoltage lockout, and low-dropout performance. The operating temperature range for the AP139-28WL-7 is from -40°C to +85°C.

Due to its small size and wide range of features, the AP139-28WL-7 is used in electronic circuits in various applications, including consumer electronics, industrial and automotive applications, such as microcontrollers, servers, lights control systems, automotive infotainment systems, and power supplies. Some of its advantages include high efficiency, low power dissipation, high output accuracy, low noise, and low power consumption.

The working principle of a linear voltage regulator is based on a negative feedback loop. In the case of the AP139-28WL-7 regulator, an output voltage divider is used to compare the output voltage with an internal reference. The difference between the two voltages is used by an error amplifier to adjust the output voltage by adjusting the gate voltage of a pass element, such as a transistor.

The pass element is designed to regulate the current to the load by allowing more or less current based on the gate voltage of the transistor. When the gate voltage is increased, more current is allowed. Conversely, when the gate voltage is decreased, less current is allowed. The AP139-28WL-7 is designed to regulate the output voltage to within the specified limits by adjusting the gate voltage of the pass element.

In conclusion, the AP139-28WL-7 is a linear voltage regulator that belongs to the PMIC family. It is used in various electronic circuits and systems for its reliability, efficiency, and versatility. It works by comparing the output voltage with an internal reference voltage and adjusting the gate voltage of the pass element to regulate the current to the load, thus providing a stable output voltage.

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