MC78M09CTG

Series:	--
Packaging:	Tube
Part Status:	Active
Output Configuration:	Positive
Output Type:	Fixed
Number of Regulators:	1
Voltage - Input (Max):	35V
Voltage - Output (Min/Fixed):	9V
Voltage - Output (Max):	--
Voltage Dropout (Max):	--
Current - Output:	500mA
PSRR:	80dB (120Hz)
Control Features:	--
Protection Features:	Over Temperature, Short Circuit
Operating Temperature:	0°C ~ 125°C
Mounting Type:	Through Hole
Package / Case:	TO-220-3
Supplier Device Package:	TO-220AB
Base Part Number:	MC78M

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Introduction

The MC78M09CTG is a high-performance linear voltage regulator manufactured by ON Semiconductor. This voltage regulator is designed to ensure constant output voltage and current across a wide range of input voltage and line conditions. The MC78M09CTG is a low-current, low-dropout, high-efficiency solution for applications requiring a negative supply.

Application Field

The MC78M09CTG is most commonly used in automotive, automotive audio, industrial, audio, appliance, and communication systems. It is suitable for both mobile and stationary applications that require a negative voltage of -9V and wide line and load regulation. The MC78M09CTG is well suited for automotive applications such as regulated outputs in air bag and anti-lock braking systems, and fuel gauge and dash monitors for a wide temperature range. The device is also suitable for industrial applications such as security and building automation systems, and for communications systems such as modems, base stations, and antennas.

The Working Principle of the MC78M09CTG

The MC78M09CTG operates on the principle of a linear voltage regulator. It consists of an internal series pass transistor and an NPN transistor. The regulator uses the NPN transistor to regulate the output voltage. The regulated voltage is maintained by adjusting the base current of the pass transistor, so that the output voltage is maintained at a constant level.The pass transistor\'s current passing ability is regulated by the ratio of the output voltage to the input voltage, which is set by the voltage divider. The voltage divider consists of typically two resistors, with the lower resistor connected to the output and the higher resistor connected to the input. The pass transistor\'s current passing ability is therefore determined by the resistors\' ratios.

Output Voltage Regulation

The MC78M09CTG offers excellent output voltage regulation. With a low-dropout voltage of just 500 mV and a wide input voltage range from 0 V to +20 V, the device provides steady output voltage over a wide load current range. The device also features a temperature compensation network that adjusts the output regulation for temperature variations.

Ripple Rejection

The MC78M09CTG offers outstanding ripple rejection capabilities. It has a high peak-to-peak ripple rejection ratio of 75db, which helps to ensure clean, regulated output voltage. This allows the device to perform well in noisy environments, such as those induced by switching power supplies.

Conclusion

The MC78M09CTG is an excellent solution for applications requiring a negative supply. It features excellent output voltage regulation, low-dropout voltage, and terrific ripple rejection capabilities. The device is designed for use in arduous automotive, industrial, and communication systems that require a negative voltage of -9 V and wide line and load regulation.

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