MC78M08CDTX

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The MC78M08CDTX is a three-terminal low-dropout (LDO) linear regulator, specifically designed to provide up to 100 mA of load current with a dropout voltage at maximum load current of 2 mV. This device is an excellent choice for single-supply systems and offers fast transients, low operating current, low noise output and excellent temperature stability. The MC78M08CDTX is ideal for low-power applications such as LED drivers, consumer electronics, automotive, etc.

Application Field

The MC78M08CDTX is an ideal choice for countless low power applications, one of the most popular being LED lighting. An LED lighting system usually requires a reliable current source to drive the LEDs with enough power to make them shine. MC78M08CDTX allows the user to create a reliable current source which can be adjusted to the desired value to power any number of LEDs in the system. It is also suitable for use in consumer electronics, computing and automotive applications.

Working Principle

The MC78M08CDTX is an adjustable, linear, low dropout voltage regulator that operates over a wide input voltage range of 2.5 V to 24 V. Its reference voltage (Vref) is factory-programmed to 4.68 V. This voltage is used to regulate the output voltage of the regulator and is controlled through two resistors connected to the two voltage divider input pins (FB1/FB2).

The MC78M08CDTX utilizes a series of small transistors (Diodes and transistors), to control the output voltage to the desired value. The transistors act as switches that open and close in order to regulate the output voltage. The transistor\'s threshold voltage is the cut-off point at which the switch opens, effectively preventing any current from flowing through it. The MC78M08CDTX features a low dropout voltage regulation circuit that maintains the voltage at its nominal value, even when the input voltage drops.

The MC78M08CDTX can be paralleled with other identical devices to increase output current. It uses an internal thermal shutdown circuit and output current limit that protects the device from over-current and over-temperature conditions.

Conclusion

The MC78M08CDTX is an adjustable, three-terminal, low-dropout linear voltage regulator, offering up to 100 mA output current. Its low-dropout feature and small footprint make it an ideal choice for LED and automotive systems. Its voltage divider inputs, thermal shutdown, and output current protection features make it a reliable and safe choice for your design.

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