UC385T-2

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UC385T-2 is a linear voltage regulator integrated circuit (IC) designed by Fairchild Semiconductor. It is a 3 terminal positive regulator that can supply an output current up to 0.5A. It is designed to provide a regulated 3.3V output voltage and is specifically designed for low power portable applications.

The UC385T-2 voltage regulator is primarily used in portable electronic products such as laptop computers and mobile phones. It is also suitable for use in other 3.3V applications, such as Automotive, Avionics, Battery Management, Communications, Computers, and Industrial Power Supplies. It is also used in automotive start/stop systems and Smart Grid applications. This IC is a cost-effective solution to regulate 3.3V and can be used in place of discrete voltage regulators to save board space, cost, and time.

UC385T-2 has several features that make it well-suited for its application field. It has an internal current limiting feature that can override any external power transistor or an external fuse to protect the circuit. It also has an automatic thermal shutdown feature, which prevents it from overheating and further protects the circuit. Another one of its useful features is a low dropout voltage of 2.2V. This feature allows the regulator to provide a regulated output voltage even with a low input voltage.

When it comes to the working principle of the UC385T-2 voltage regulator, the basic idea is simple. It is a 3 terminal regulator with one input, one output, and one ground. The input is connected to the power source, the output is connected to the desired voltage, and the ground terminal is connected to the output voltage. A feedback loop is implemented to ensure that the output voltage does not vary from the required value regardless of input voltage or load changes.

The UC385T-2 employs an error amplifier composed of transistors, resistors, and capacitors. This error amplifier monitors the output voltage and sends its output either to the ground or to the positive terminal of the power transistor, depending on whether the actual output voltage is higher or lower than the desired voltage. When the actual output voltage is higher than the desired voltage, the amplifier sends a signal to the ground to decrease the output voltage. On the other hand, if the output voltage is lower than the reference voltage, the power transistor is commanded to increase the output voltage. This process is repeated to ensure that the regulator is always able to provide a regulated output voltage, even when the input voltage or the load current changes.

The UC385T-2 can provide a regulated output voltage from 2.5V to 37V, depending on the application requirements. The regulator supports up to 0.5A output currents, making it suitable for mid-power applications. The IC is offered in a 5-pin TO-220 package and operates across a wide temperature range. The device has a built-in thermal shutdown circuit and overcurrent protection, which make it safe for use in many different types of applications.

In summary, the UC385T-2 is a highly integrated linear voltage regulator IC designed by Fairchild Semiconductor. It is primarily used in portable electronic products such as laptop computers and mobile phones. It is also suitable for use in 3.3V applications such as Automotive, Avionics, Battery Management, Communications, Computers, and Industrial Power Supplies. The IC has a built-in thermal shutdown circuit and overcurrent protection, making it an ideal choice for mid-power applications. Its low dropout voltage of 2.2V and up to 0.5A output current make it an ideal choice for many different applications.

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