MC78L18ACPRMG

Current - Output:	100mA
Base Part Number:	MC78L18
Supplier Device Package:	TO-92-3
Package / Case:	TO-226-3, TO-92-3 (TO-226AA) (Formed Leads)
Mounting Type:	Through Hole
Operating Temperature:	0°C ~ 125°C
Protection Features:	Over Temperature, Short Circuit
Control Features:	--
PSRR:	48dB (120Hz)
Current - Quiescent (Iq):	6.5mA
Series:	--
Voltage Dropout (Max):	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	18V
Voltage - Input (Max):	35V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Box (TB)

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MC78L18ACPRMG application field and working principle

The MC78L18ACPRMG is a monolithic linear voltage regulator designed and manufactured by the semiconductor company NXP (formerly Philips semiconductor). This 3-terminal low-dropout (LDO) voltage regulator is designed to use in a wide range of applications from post-regulator for switch mode supplies to Wide-range regulated voltage converter and battery-powered systems. The MC78L18ACPRMG is available in two packages: TO-92 and SO-8.

Functional Operation

The MC78L18ACPRMG consists of a reference voltage within its structure along with an output transistor, which is used for producing a regulated output voltage. The input voltage entering the voltage regulator is compared to the reference voltage within the regulator. The output transistor is connected between the collector and emitter. If the input voltage is higher than the reference voltage, the base-emitter junction of the pass transistor gets forward biased and the transistor gets into a conducting state. This causes a current to flow in the output of the regulator and maintains an output voltage.

Features

The MC78L18ACPRMG voltage regulator offers many features which make it well-suited for its application in battery-powered systems and wide-range regulated voltage conversion. These features include: low dropout voltage, wide operating input range, low quiescent current, thermal shutdown protection, current limiting protection, and reversed-blocking protection. Low Dropout Voltage : The MC78L18ACPRMG provides a low dropout voltage of typically 0.6V. This makes it suitable for battery-powered systems where a small voltage difference between the output voltage and the input voltage is essential for a longer battery life.Wide Operating Input Range: The MC78L18ACPRMG has a wide operating input range from 2.7V to 11V, making it suitable for a wide range of regulated voltage conversion.Low Quiescent Current: The MC78L18ACPRMG requires a low quiescent current of typically 500uA to maintain the regulated output. This helps to minimize power consumption in battery-powered applications.Thermal Shutdown Protection: The MC78L18ACPRMG has a built-in thermal shutdown protection, which ensures that the regulator output remains in regulation even at high ambient temperatures.Current Limiting Protection: The MC78L18ACPRMG provides a current limiting protection which prevents excessive current flow in the circuit.Reversed Blocking Protection : The MC78L18ACPRMG has a reversed blocking protection which prevents the regulator from working with a reversed input supply.

Applications

The MC78L18ACPRMG is suitable for a wide range of applications such as post-regulator for switch mode supplies, wide-range regulated voltage converter, and battery-powered systems. Other applications include automotive systems, consumer electronics, and portable devices.

Conclusion

The MC78L18ACPRMG is a 3-terminal low drop-out (LDO) voltage regulator manufactured by NXP (formerly Philips semiconductor). This device offers many features including low dropout voltage, wide operating input range, low quiescent current, thermal shutdown protection, current limiting protection, and reversed-blocking protection. It is well-suited for post-regulator for switch mode supplies, wide-range regulated voltage converter, and battery-powered systems.

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