MC79M05BTG

Voltage Dropout (Max):	1.1V @ 500mA (Typ)
Base Part Number:	MC79M
Supplier Device Package:	TO-220AB
Package / Case:	TO-220-3
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature
Control Features:	--
PSRR:	66dB (120Hz)
Current - Output:	500mA
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	-5V
Voltage - Input (Max):	-35V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Negative
Part Status:	Active
Packaging:	Tube

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Introduction

MC79M05BTG is a widely used linear voltage regulator integrated circuit (IC) produced by STMicroelectronics. The IC is available in a 5-pin SOT-223 package, and its chief purpose is to provide a regulated output voltage to a variety of electronic devices. In essence, it is a three-terminal linear voltage regulator, with an adjustable output voltage from 1.5V to 37V with an output current of up to 100mA.

MC79M05BTG Application Field

The MC79M05BTG is commonly used for the regulation of electrical components and system in a broad scope of electronic applications. Its main application includes voltage regulating for portable electronic devices and consumer electronics, such as digital cameras, PDAs, MP3 players, and portable radios. It can also be used in embedded industrial control systems, power telecommunication equipment and audio/video systems.

MC79M05BTG Working Principles

The MC79M05BTG is basically a three-terminal linear voltage regulator with an adjustable output voltage from 1.5V to 37V. It has two main parts- the voltage reference stage and the voltage regulator stage.The voltage reference stage is where the MC79M05BTG produces a reference voltage. This reference voltage is then compared against an external voltage, also known as the input voltage, which is connected to the regulator at its input terminals. When the reference voltage is lower than the input voltage, the output voltage decreases. When the reference voltage is higher than the input voltage, the output voltage increases.In the voltage regulating stage, the MC79M05BTG compares the post-regulation output voltage with the reference voltage produced by the reference stage. If the output is higher than the reference voltage, then the difference is directed to the series pass element, which reduces the output voltage to bring it back to the reference voltage. On the other hand, if the output is lower than the reference voltage, the reference signal is applied to a voltage amplifier, which increases the output voltage accordingly.

Conclusion

In conclusion, the MC79M05BTG is a versatile, three-terminal linear voltage regulator IC, which is applicable to a wide range of electronic applications. It achieves excellent performance and accuracy by sensing the input and output voltages, and comparing them to the pre-set reference voltage. The MC79M05BTG is relatively easy to set up, and requires minimal external components, making it a useful and cost-effective solution for many electronics projects.

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