MC78L12ACPG

Current - Output:	100mA
Base Part Number:	MC78L12
Supplier Device Package:	TO-92-3
Package / Case:	TO-226-3, TO-92-3 (TO-226AA)
Mounting Type:	Through Hole
Operating Temperature:	0°C ~ 125°C
Protection Features:	Over Temperature, Short Circuit
Control Features:	--
PSRR:	42dB (120Hz)
Current - Quiescent (Iq):	6.5mA
Series:	--
Voltage Dropout (Max):	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	12V
Voltage - Input (Max):	35V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Bulk

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Introduction

The MC78L12ACPG is a linear voltage regulator that comes in the shape of an 8-pin surface-mount package. It offers the flexibility of a wide 5 V to 18 V input voltage range, a current limiting capability, and a dropout voltage that doesn’t exceed 1.5 V. It is well-suited for low-power applications including battery-powered devices, computations, computers and desktop applications.

Features

• Output voltage range from 5 V to 18 V
• Output current of 0.1 A to 1 A
• Dropout voltage of 1.5 V maximum
• Reverse current protection to enhance reliability and protect the integrated circuit
• Low noise due to its bipolar architecture
• Low cost
• Soft-start circuit to provide inrush current protection;
• Over temperature and over current protection
• Overload and short-circuit protection

Applications

The MC78L12ACPG can be used in a range of applications due to its wide 5 V to 18 V input voltage range and low dropout voltage. It is designed to support low power applications such as battery powered devices, computers, computations, and desktop applications. It is also suitable for providing a stable voltage in car audio systems, automotive modules and other automotive applications.

Case Studies

MC78L12ACPG, when used as a negative supply in desktop computers, can provide a regulated output voltage of between -5 V and -18 V, while it also keeps the output current limited to 0.1 A − 1.0 A. It is also used in automotive applications such as fuel pumps, ECU (electronic control unit), and lighting systems. Furthermore, its reliability and low dropout voltage make it the perfect choice for telecommunications systems and data processing systems.

Working Principle

The MC78L12ACPG is a linear regulator integrated circuit with three basic sections; a voltage reference, an error amplifier and a pass transistor. The voltage reference generates a fixed voltage typically between 1.2 V and 3.3 V, and it is used as a reference for the output voltage of the regulator. The error amplifier compares the output voltage of the regulator to the reference voltage, and it amplifies the difference between the two. The amplified signal is then sent to the pass transistor, which controls the amount of current flowing through it. The current flowing through the pass transistor is then filtered, regulated, and can be used as the output voltage of the regulator. The MC78L12ACPG can also provide short-circuit, overload, and over-temperature protection. It is designed with a current-limiting feature, which limits the output current of the regulator in case of an overload or short-circuit condition. The over-temperature protection is provided by a thermal shutdown circuit, which turns off the regulator when the chip temperature reaches a certain set limit, thereby preventing any possible damage.

Conclusion

The MC78L12ACPG is an 8-pin surface-mount package linear voltage regulator that offers the flexibility of a wide 5 V to 18 V input voltage range, current limiting capability, and low dropout voltage. It is suitable for low-power applications such as battery-powered devices, computations, computers, and desktop applications. It provides overload, short-circuit, and over-temperature protection, which enhances reliability and protects the integrated circuit. Furthermore, its low noise feature and cost-effectiveness make it the ideal choice for many applications.

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