MC7805ECTBU

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The MC7805ECTBU is part of a family of multiple versions of medium input voltage and fixed output voltage linear voltage regulators. It is designed for use in applications that require up to 5A output current, such as battery-powered devices and automotive electronic loads. As a low drop-out regulator, it keeps input voltages close to their output voltage values, which makes it suitable for applications with lower input voltages than the output voltage, like when powered from a battery.

Application Field: The MC7805ECTBU is an excellent choice for a variety of applications that require a very high level of efficiency due to its low quiescent current. It is ideal for battery-powered equipment, and its wide input voltage range makes it suitable for automotive, solar and stationary industrial applications. It is also suitable for applications such as DC-DC converters, electric vehicle (EV) applications, power conditioning, wall transformers, and power supplies.

Working Principle: The MC7805ECTBU is a three terminal, low dropout linear voltage regulator with a maximum output current of 5A. It includes a stepped down output and a ground terminal. It generally operates at a voltage drop of 0.65V up to 5A. The regulator operates by controlling the output voltage via the output of a precision bandgap reference and a series of current limiting contacts, setting a stable output voltage regardless of changes in line, load or temperature conditions. The regulating effect is a result of the input-output voltage differential, current limiting and the protection against over-load and short circuit conditions.

The MC7805ECTBU is designed to be used with a power transistor as the series pass element for providing current output up to 5A. The power transistor is typically connected in the form of a source follower, but can also be connected as a common emitter or emitter follower. The three terminals of the MC7805ECTBU allow for the current limiting circuit to be configured independently, making the design of the power supply simpler and more efficient. The output of the regulator is adjustable to the fixed 1.25V output voltage by the combination of a resistor and variable voltage divider.

The MC7805ECTBU offers excellent thermal management due to its design with low thermal resistance, allowing it to operate in extreme temperatures without losing output accuracy. It includes an over-temperature shutdown that protects the regulator and offers good thermal protection. The MC7805ECTBU also offers reverse battery protection and is designed to minimize the possibility of start-up current due to its low dropout voltage.

In summary, the MC7805ECTBU is a versatile medium input voltage and adjustable output voltage sequential regulator designed for use in many different applications, such as automotive and battery-powered equipment, as well as EV applications and power supplies. It offers excellent regulation accuracy and thermal performance, as well as protection from short circuit, over-current and over-temperature conditions. It is an ideal choice for applications that require high efficiency and low dropout voltage.

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