Series:	--
Packaging:	Tube
Part Status:	Active
Output Configuration:	Positive
Output Type:	Fixed
Number of Regulators:	1
Voltage - Input (Max):	35V
Voltage - Output (Min/Fixed):	18V
Voltage - Output (Max):	--
Voltage Dropout (Max):	--
Current - Output:	500mA
PSRR:	70dB (120Hz)
Control Features:	--
Protection Features:	Over Temperature, Short Circuit
Operating Temperature:	-40°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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MC78M18BTG Application Field and Working Principle

The MC78M18BTG is a 3-terminal linear voltage regulator produced by ON Semiconductor. It is a positive adjustable voltage regulator. This 3-terminal regulator has a wide input voltage range from 7 V to 36 V and an output voltage adjustable from 1.2 V to 37 V. It provides up to 750 mA output current and is offered with thermal shutdown protection, overload protection and reverse blocking capability.The MC78M18BTG is a monolithic integrated circuit for linear voltage regulation and is ideally suited for use in fixed and adjustable switching power supplies, battery chargers, high brightness LED drivers and other power management applications. This voltage regulator can also be used in sensitive electronic circuits to prevent damage due to normal line voltage fluctuations or load current demand changes.The typical dropout voltage of this device is 2 V. The device has an internal current limit and over-temperature protection. With its fast response time and good transient response, the device maintains excellent regulation even during heavy load changes.In terms of working principle, the MC78M18BTG voltage regulator features a three-terminal regulator control circuit that uses negative feedback to control the output voltage. This means that the output voltage is always maintained to a certain voltage level, no matter how the input voltage or regulator loading changes.To maintain this output voltage, the regulator\'s control circuit uses the error amplifier to sense the output voltage and compares it against its internal reference voltage. When it gets the error signal, it drives the output transistor to elevate or drop the current flowing through the sense resistor. When such regulation systems are in place, there is no need for additional circuitry such as a PNP current source.The MC78M18BTG also features a built-in MOSFET switch for low dropout voltage operation. When the input voltage is below the output voltage, the MOSFET switch is opened, reducing the dropout voltage significantly. This feature is useful in applications where the input voltage is close to the output voltage and the input voltage varies throughout the day.The MC78M18BTG can be used in many different applications, including:• DC-DC converter• Low dropout regulator• Battery charger• High brightness LED driver• Motors drives• Motor control• Power management• Automotive power supply• Solar panel tracking In conclusion, the MC78M18BTG is a 3-terminal linear voltage regulator produced by ON Semiconductor. It is a positive adjustable voltage regulator with a wide input voltage range of 7 V to 36 V, and an output voltage adjustable from 1.2 V to 37 V. This device features a three-terminal regulator control circuit, error amplifier, built-in MOSFET switch and a variety of protection features. The MC78M18BTG is a great choice for various power management applications.

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