MC7809AECTBU

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The MC7809AECTBU is a linear voltage regulator from ON Semiconductor. It is a fixed three-terminal positive voltage regulator, specifically designed for high-current, low drop-out (LDO) applications. The MC7809AECTBU is capable of providing up to 1.5A of output current, with a low drop-out voltage of only 1.3V at 1A output current. In addition, the operating temperature range of the MC7809AECTBU is -40°C to 125°C.

The MC7809AECTBU is designed to output a regulated voltage of 9V, with an initial accuracy of ±2%. The output voltage is maintained at 9V by an internal band-gap reference and an error amplifier. The band-gap reference output is compared to the output, and the difference is amplified by the error amplifier. The error voltage is then compared to a voltage ramp generated by an internal current source, and the result is applied to the base drive of the pass transistor. The pass transistor regulates the voltage at the output and changes it until the difference between the internal reference voltage (VREF) and the output voltage is minimized.

The MC7809AECTBU also features over-temperature protection, over-current protection, and short circuit protection. The over-temperature protection is accomplished by using an internal temperature sensing circuit. The over-current protection is accomplished by sensing the voltage drop across the output pass transistor. When the voltage drop exceeds a certain threshold, the output voltage is disabled by reducing the base drive to the pass transistor. The short circuit protection is accomplished by limiting the current going through the pass transistor and disabling the output voltage if the short between VOUT and ground is detected.

The MC7809AECTBU is suitable for a wide range of applications including computer peripherals, battery-powered devices, telecoms equipment and consumer electronics. Thanks to its low input voltage range of 6.5 to 20V and its low drop-out voltage of 1.3V, the MC7809AECTBU is also well suited for automotive applications such as backlighting for instrument clusters, parking sensors and telematics systems. It is also ideal for powering high-current video processors, LED lighting, micro-controllers and other similar applications.

With its high current capability, robustness, small size and wide operating temperature range, the MC7809AECTBU is an ideal choice for a variety of low drop-out applications. Its high-performance and excellent reliability make it an excellent choice for any application requiring a reliable voltage regulator.

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