MC7905ACD2TR4

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Introduction

MC7905ACD2TR4 is a standard linear voltage regulator in Linear-PMIC (Power Management Integrated Circuit) family. It is a 5 V voltage regulator with low dropout and so-called “low current mode”. It works with 3-terminal output and is used mainly in mobile applications.

Application Field

In the modern day and age, mobile phones are changing day by day. The MC7905ACD2TR4 voltage regulator is mainly used in the smartphones due to their high power requirements. It works with a regulated voltage supply, which usually ranges from 5 V up to 24 V and can handle up to 10 A of output current. It is a rather small device that can fit into any kind of small mobile device, offering good performance and a low-dropout voltage regulator.

Apart from smartphones, MC7905ACD2TR4 is used in various other applications as well. Other devices that require a low-dropout voltage regulator include reel-to-reel audio players, telecommunication devices, TV set-top boxes, measurement instruments, laptop computers, and monitors. In certain cases, MC7905ACD2TR4 can also be used with medical equipment, such as monitors, defibrillators, and pacemakers.

Working Principle

The MC7905ACD2TR4 works by reducing the input voltage from a higher voltage to a lower voltage that’s suitable for powering various processes and tasks. This is commonly referred to as “linear voltage regulation”. The device consists of a series of resistors, a transistor, and a zener diode, as shown in the figure. When the input voltage is applied, the transistor starts to conduct and the zener diode limits the voltage across the transistor to a predetermined value.

The resistor and transistor form a voltage divider. This divider creates a relative low-impedance and an output voltage, shown as the ‘low voltage output’ in the figure. The zener diode keeps the output voltage constant. The amount of current drawn from the input and output is determined by the voltage regulator itself. Whenever more current is drawn from the output, more voltage is also supplied from the input. This ensures that the output voltage stays at the predetermined value.

In short, the MC7905ACD2TR4 works by monitoring the output current and output voltage. It adjusts the voltage from the input to maintain the output voltage at a fixed level, no matter what the load is. This makes it an ideal voltage regulator for mobile electronic devices, as it ensures a constant output even when the device is being used heavily.

Conclusion

In conclusion, MC7905ACD2TR4 is a linear voltage regulator that is used in a wide range of mobile devices and other applications. It works by monitoring the output current and voltage and adjusts the voltage from the input to maintain the output voltage at a fixed level. Thus, it is an ideal voltage regulator for mobile electronic devices as it ensures a constant output even when the device is being used heavily.

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