MC78M18CDT

Voltage Dropout (Max):	--
Base Part Number:	MC78M
Supplier Device Package:	DPAK
Package / Case:	TO-252-3, DPak (2 Leads + Tab), SC-63
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 125°C
Protection Features:	Over Temperature, Short Circuit
Control Features:	--
PSRR:	70dB (120Hz)
Current - Output:	500mA
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	18V
Voltage - Input (Max):	35V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tube

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Introduction to the MC78M18CDT

The MC78M18CDT is a monolithic three-terminal positive voltage regulator from Texas Instruments. It offers three-terminal 1.5A fixed output voltage with a wide input voltage range from 14V - 40V and features low on-resistance and low dropout, and is designed to be used in multiple application field. This article will introduce you to the application field and working principle of the MC78M18CDT.

Application Field

The MC78M18CDT is mainly used in automotive, computers, gaming consoles, medical, and other digital and communication applications. With its wide input voltage range, the MC78M18CDT can work efficiently in a wide range of operating temperatures, making it an ideal choice for high-performance applications in harsh working environments. In automotive applications, its use enables system designers to reduce the number of power supply rails, saving space, reducing weight, and extending battery life.In computer and gaming applications, the MC78M18CDT can enable high-efficiency power conversion, reducing power consumption and minimizing heat generation. Further, its capabilities in reducing output voltage ripple, reducing output impedance and maintaining stability in the presence of noise, makes it a great choice for power delivery in high frequency systems.In medical applications, the MC78M18CDT\'s efficiency and no heat production makes it highly suitable for the operating environment that a medical device must work in. Additionally, its reverse current protection ensures that the electrical components are not damaged even in the event of a voltage surge, increasing reliability and increasing the lifespan of the device.

Working Principle

The MC78M18CDT works on a linear voltage regulator principle. It consists of three terminals: an input (VIn), output (VOut) and common (Gnd). The device operates by reducing the voltage at the output terminal. This is achieved by connecting a low resistance device, usually a MOSFET transistor, between the input and the output terminals. The device has a forward voltage drop between the input and output terminals and this is adjusted depending on the load current being dissipated.The MC78M18CDT also features a built-in circuit protection which helps protect against over current, over voltage, short circuit, and reversed polarity. This ensures that the output remains stable and prevents any potential damage to the device.

Conclusion

The MC78M18CDT is a monolithic three-terminal positive voltage regulator from Texas Instruments which offers a wide input voltage range from 14V - 40V and is designed for multiple application fields. Its main use is in automotive, computers, gaming consoles, medical, and other digital and communication applications. Its use enables system designers to reduce the number of power supply rails, saving space, reducing weight, and extending battery life. The MC78M18CDT works on a linear voltage regulator principle, featuring a forward voltage drop between the input and output terminals and built-in circuit protection which helps protect against over current, over voltage, short circuit, and reversed polarity.

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