MC7905ACT

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MC7905ACT Application Field and Working Principle

MC7905ACT is a low dropout (LDO) linear regulator that can provide up to 1A of output current to the load, and it belongs to Linear Voltage Regulators of PMIC (Power Management IC) - Voltage Regulators.

The MC7905ACT is a voltage regulators featuring ultra-low dropout operation in a very standard TO-92 (SOT-223) package, which bring good stability and high efficiency for application. It prevents the output voltage of a DC power supply from excessive changes, maintaining the output voltage at a stable level, so the performance of the load circuits is not affected. Its wide input voltage range of 2V to 30V makes it suitable for various application circuits. In addition, it has a low temperature coefficient and good line and load regulation, making the output voltage more stable.

The MC7905ACT application includes industrial control and various electronic devices, such as electronic toys, mobile phones, computers and other electronic products. Besides, MC7905ACT is especially suitable for portable electronic devices requiring low power consumption, such as MP3 players, portable audio players and so on.

MC7905ACT has many attractive features, such as low on-resistance, low standby current, low operating temperature, etc., which make it suitable for various battery-powered applications. Usually it is combined with lithium-ion battery, whose battery current must be limited, thus reduces the electrolyte sulfated phenomenon, so that longer battery life can be obtained.

In practical applications, MC7905ACT has an on/off control signal input . It can be used to disconnect the output from the input voltage source when the signal is at low level. When the signal is at high level, the output voltage should be enabled by connecting the LDO from input to output. This feature helps reduce power consumption and prolong battery life.

The MC7905ACT is designed for horizontal or vertical mounting in TO-92 (SOT-223) package with white or black surface mount lead-frame construction, allowing the device to be as small and lightweight as possible. The package itself is non-conductive and can easily be soldered to the board. The power dissipation is low, so it is approved for full surface mounting.

The working principle consists of two parts: input/output resistance and feedback control.

Firstly, when voltage is applied to the input terminal, current will flow along the connection of output voltage, so that the internal resistance between the input and output terminals will decrease to a low value. When the output voltage that needs to be regulated is reached, the connection of the output voltage will be closed.

Secondly, the internal feedback circuitry compares the output voltage to the reference voltage to create a control signal, and this control signal will be used to control the voltage regulating elements, either increase or decrease. And in doing so, the output voltage will be regulated until it is equal to the reference voltage.

The path of the negative feedback loop is closed, thus allowing the LDO to regulate the output voltage via this feedback control loop. This feedback control loop is used to keep the output voltage regulated, no matter the changes of the load or input power supply.

In summary, the MC7905ACT is an economical and practical voltage regulator applicable to various occasions, with serving many aspects of the industry. Its advantages in low dropout and stable output make it able to provide constant and reliable power for the load, and its low-voltage warning function can remind us of the low battery power, giving us a reliable guarantee for our work.

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