MC78M09CDTG

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The MC78M09CDTG Voltage Regulator

The MC78M09CDTG is a voltage regulator from the Linear voltage regulator series, which is a part of Power Management Integrated Circuit (PMIC). It is a three-terminal negative voltage regulator with a fixed output voltage of 9 volts. The regulator has a wide range of input voltage (up to 40 volts) and is capable of supplying a maximum output current of 100mA. The low quiescent current (2.2 mA) and low dropout voltage (300 mV) make it a great choice for many power management applications.

Application Field

The MC78M09CDTG has a wide range of applications due to its versatile features. It can be used in low-voltage power supply systems, car audio and video systems, handheld devices and portable instruments. Its features such as the low quiescent current make it suitable for applications where the power consumption needs to be minimized, such as battery-powered systems. It is also used in applications requiring high stability such as in industrial automation systems, telecom systems and professional audio equipment.

Working Principle

The MC78M09CDTG follows the general structure of linear voltage regulators. The main components are the reference, error amplifier, feedback resistor, PNP transistor and NPN transistor. It works by maintaining a reference voltage across the feedback resistor, which is a resistive divider network, providing a feedback voltage to the error amplifier. The error amplifier, in turn, compares the reference voltage with the output voltage and adjusts the gate current of the PNP transistor accordingly. This adjusts the voltage across the NPN transistor, which is connected to the output, resulting in output voltage being maintained constant.

The MC78M09CDTG voltage regulator is also equipped with reverse-current protection, short-circuit protection and over-temperature protection. The reverse-current protection ensure that no reverse current flows through the output. The short-circuit protection protects the voltage regulator from high output current and protects the load from the voltage regulator. The over-temperature protection ensures that the regulator does not get too hot, preventing the destruction of the regulator and the load.

Conclusion

The MC78M09CDTG is a three-terminal negative voltage regulator from the Linear voltage regulator series of PMICs. It provides a stable output voltage of 9 volts from a wide range of input voltages, making it applicable to a variety of power management applications. Its features such as low quiescent current, low dropout voltage and temperature protection make it well suited for use in battery powered systems and portable instruments.

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