FAN1112SX Integrated Circuits (ICs)

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FAN1112SX Application Field and Working Principle

The FAN1112SX is a linear voltage regulator IC from the FAN111/112 family. It is a low-dropout, advanced CMOS voltage regulator that integrates a p-channel power MOSFET, providing low noise, high power efficiency, and high output current. The FAN1112SX is well-suited for use in low-noise, portable, and power-sensitive applications. The device features a wide input voltage range of 3.0V to 20V and an adjustable output voltage range of 0.5V to 13V.

Application Field

The FAN1112SX is designed for applications such as smartphones, tablets, and IoT systems. Its low-dropout, high-output current capabilities are especially useful in these devices. It can also be used in other power-sensitive applications such as automotive, industrial, and medical applications. Its high power efficiency makes it a great choice for battery-powered applications.

Working Principle

The FAN1112SX works by comparing the output voltage to a reference voltage and then adjusting the output accordingly. The reference voltage is created by the bandgap reference circuit and is typically 1.25V. The error amplifier then adjusts the output voltage in accordance with the difference between the reference voltage and the output voltage. The output voltage is adjusted by controlling the gate voltage of a p-channel power MOSFET, which acts as an electrical switch.

The output voltage is regulated by the combination of the input voltage, the sense voltage, the pass device gate voltage, and the feedback loop created by the error amplifier. The error amplifier compares the output voltage to the reference voltage, and produces an output that is proportional to the difference. The output of the error amplifier is then used to adjust the pass device, which act as a switch to regulate the output voltage.

The FAN1112SX also features several protection features to ensure safe operation. It integrates overvoltage, overcurrent, and thermal shutdown that protects against abnormal conditions. Additionally, it has foldback current limiting, which limits the maximum output current to protect against short-circuits, as well as current limiting, which reduces the output current when the input voltage drops below a certain threshold.

Conclusion

The FAN1112SX is a high-performance linear voltage regulator that is suitable for power-sensitive applications such as smartphones, tablets, automotive, industrial and medical applications. It features a wide input voltage range from 3.0V to 20V and an adjustable output voltage range from 0.5V to 13V. It offers low-noise, high power efficiency, and high output current. It also provides several protection features to ensure safe operation.

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