FAN25800AUC33X

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Linear Voltage Regulators (LVRs) are an important part of power management integrated circuit (PMIC) solutions because of their ability to accurately regulate output voltage which is needed to achieve power efficiency, performance, and long product lifetime. The FAN25800AUC33X is a 3 A, low-dropout (LDO) linear regulator from Fairchild Semiconductor. It is widely used in automotive and industrial applications for providing a regulated supply voltage for powering downstream components. This article will discuss the application fields and working principle of the FAN25800AUC33X.

The FAN25800AUC33X is a three-terminal, low-dropout (LDO) linear regulator with a wide input voltage range of 8 V to 36 V and capable of adjusting the output voltage from 0.6 V to 5.5 V. It features a low operating current of 33 uA that provides an efficient solution for space constraint applications. The device is offered in a small, thermally-enhanced, space-saving SOT-23 package and it can operate up to 5A at 8Vin with an external PNP transistor, making it suitable for a variety of automotive, industrial and home appliance applications. An internal thermal shutdown circuit provides a high level of protection against thermal overload and the current limit of the device is set at 1.5A for protecting downstream components against over current and shunting.

The FAN25800AUC33X employs a p-channel MOSFET as the main pass switch. The output voltage is regulated by the MOSFET’s gate-source voltage, which is set by the internal error amplifier. The internal error amplifier monitors the output voltage and compares it with a reference voltage and adjusts the gate-source voltage of the MOSFET accordingly. When the output voltage drops, the MOSFET gate-source voltage increases, thus increasing the current flow through the MOSFET and resulting in an increase in the output voltage. The same principle works in reverse when the output voltage needs to be decreased.

The FAN25800AUC33X is designed for a wide range of automotive and industrial applications. It can be used in automotive environments powering automotive-based systems, from infotainment and convenience systems to active safety applications. The device is also well-suited for industrial applications such as motor control, communication interface and industrial automation. The FAN25800 can also be used in home appliances, such as coffee makers and microwaves, as well as lighting applications.

In addition to the device’s wide input voltage range, it features an adjustable output voltage, short-circuit protection, and thermal shutdown. The current limit of 1.5A protects the device against short circuit, over current and shunting. The device is also composed of low-noise bypass capacitors, which helps ensure clean voltage regulation and eliminates the need for extra filtering components.

The FAN25800AUC33X is an excellent all-in-one solution for automotive, industrial and home appliance applications. It has all the features that are required for a reliable, low dropout linear regulator. With a wide input voltage range, adjustable output voltage and a guaranteed current limit of 1.5A, the device ensures that the output voltage is accurately regulated, resulting in improved performance and long-term reliability.

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