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:	63dB (120Hz)
Current - Output:	500mA
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	-8V
Voltage - Input (Max):	-35V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Negative
Part Status:	Obsolete
Packaging:	Tube

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MC79M08BT Application Field and Working Principle

Introduction to MC79M08BT

The MC79M08BT is a monolithic three-terminal negative voltage regulator, suitable for a variety of negative power-supply applications. It is a two-terminal adjustable device, typically used to perform positive-to-negative inversion and also to provide a low-dropout voltage between them. This regulator requires a minimum of external components to operate and offers excellent line and load regulation for such applications. The MC79M08BT is available in 3-pin SOT-223 and 5-pin TO-220 packages, providing a current-limiting feature for added protection.

Application Fields of MC79M08BT

The MC79M08BT is often used in negative supply regulator applications such as laptop battery taking circuits, penmachine devices and other similar systems. It can also be used in general purpose low-voltage systems with a range of up to two amps. Due to its feature of lower dropout voltage, the MC79M08BT can be successfully used in voltage conversion applications as well. This device is suitable for step-down converters with lower voltage levels. It can also act as an active load due to its low output current and low impedance. This makes the MC79M08BT an ideal choice for DC/DC conversion applications in medical, automotive, industrial and consumer applications.The MC79M08BT can be used in battery chargers and in machine tools as it is compatible with any battery chemistry. Moreover, it is also used in regulated power supplies for low voltage/current systems and for negative voltage regulation for telecom systems.

Working Principle of MC79M08BT

The MC79M08BT is an adjustable, monolithic three-terminal negative voltage regulator with an output voltage range from -1.35V to -37V. Its wide range of input voltages offers superb electrical performance. Its low dropout and low output impedance make the MC79M08BT extremely well-suited for space-constrained and cost-sensitive applications.This integrated circuit features a precision voltage reference that ensures accuracy and stability, robust output current limiting and protection circuitry to guard against overloads, and reverse avalanche breakdown mode that provides superior output dynamic response. The MC79M08BT is designed to dissipate very little heat and withstand extreme stress, making it an ideal choice when reliability and performance at low voltage levels are required. The device also has a temperature range of -40°C to +125°C and a wide operating range of -0.3V to -40V.The output voltage of the MC79M08BT is adjustable and depends on external resistor and capacitor values, as shown in the following formula:
VOUT = VREF * [1 + (R1/R2)] where VREF is typically -1.25 V and R1 and R2 are the two external resistors connected to the device.In operation, the MC79M08BT drives the base of the internal PNP transistor with a minimum output impedance. This generates a negative output voltage, as shown in the diagram. The device features overvoltage, reverse voltage and thermal protection, thereby assuring robust and safe operation.

Conclusion

The MC79M08BT is an adjustable, monolithic three-terminal negative voltage regulator with an output voltage range from -1.35V to -37V. It requires very few external components and is suitable for a variety of applications. The device offers superb electrical performance due to its precision voltage reference, robust output current limiting and protection circuitry, and reverse avalanche breakdown mode that provides superior output dynamic response. In addition, it is designed to dissipate very little heat and can withstand extreme stress, making it an ideal choice when reliability and performance at low voltage levels are required.

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