MC7905CT

MC7905CT is a three terminal, adjustable positive voltage regulator from STMicroelectronics. This high performance three terminal positive regulator is capable of delivering up to 1A output current and typically provides an output voltage of 5V with a maximum output ripple of 50 mV. It has a dropout voltage of 2.2V at 1A. The MC7905CT regulator is designed for applications which require accurate regulation of the output under varying temperature and load, such as telecommunications and personal computers, and many other electronic systems.

Application Field

The MC7905CT voltage regulator is a linear regulator. It is commonly used in DC/DC converters, on-board voltage regulation, embedded systems, power management applications and motor control applications. The device is also suitable for communication circuits, automotive electronics, medical equipment, and more.

The device has low quiescent current, low dropout voltage and wide input voltage range, making it suitable for battery-powered applications. The device is available in an industry standard DIP package and LDO versions, which makes it ideal for real-time and high power applications.

Working Principle

The MC7905CT voltage regulator operates by comparing the output voltage to a predetermined reference voltage. The difference between the two is named the error voltage. An error amplifier monitors this difference and controls a pass element so that the output follows the reference voltage. This simple feedback mechanism enables the MC7905CT to maintain a steady output voltage, regardless of the load and temperature changes.

The MC7905CT consists of a vertical PNP transistor, series pass element, a low dropout junction, error amplifier and a temperature compensated bandgap voltage reference. This combination helps the device to offer excellent performance such as high accuracy, fast response, low dropout voltage, low quiescent current, fast start-up time and low output noise.

The device itself is a 3-pin package and the pins consist of a ground pin which is the negative terminal, an output pin which is the positive terminal, and a control pin. The control pin is the one which controls the voltage output of the regulator. By adjusting the voltage across the control pin, the output voltage can be adjusted accordingly.

Conclusion

The MC7905CT voltage regulator is an excellent choice for applications which require precision regulation of the output voltage. It has a low quiescent current, low dropout voltage and wide input voltage range, making it suitable for battery-powered applications. The device has high accuracy, fast response, fast start-up time and low output noise. The device itself is a 3-pin package and the pins consist of a ground pin, an output pin, and a control pin.