MC78L05ABDR2G Integrated Circuits (ICs)

MC78L05ABDR2G application field and working principle

The MC78L05ABDR2G is a low dropout (LDO) voltage regulator made by ON Semiconductor. It is an adjustable, 3-Pin Negative Voltage Regulator with an output voltage range from −1.2 V to −32 V. This device is ideal for low-noise, high stability, low current applications such as active medical implants, telecom equipment, portable computing and power management systems.

MC78L05ABDR2G belongs to the family of Voltage Regulators - Linear, a category of integrated circuits (ICs) that regulate electrical power. Voltage Regulators - Linear ensure that the output voltage remains constant, regardless of changes in input voltage, even as input and output currents/rates vary. This allows for protection against over-voltage, over-current, and short-circuit by allowing current to pass through the regulator.

Features

The MC78L05ABDR2G is an efficient and reliable linear regulator which offers the following features:

• On-board voltage regulation for controlling and maintaining constant output voltage
• High stability and low noise
• Input voltage range: 3 V to 24 V
• Output voltage range: −1.2 V to −32 V
• Output current: up to 100 mA
• Load and line regulation: 0.2% and 5 mV:0.2%
• Temperature range: -40°C to +125°C.

Applications

The MC78L05ABDR2G is widely used in variety of applications:

• Medical devices such as cardiac pacemakers and implantable drug delivery systems
• Portable consumer electronics such as mobile phones, digital cameras, PDAs, and laptop computers
• Audio equipment such as amplifiers, speakers, and sound equipment
• Industrial control and automation, measurement instrumentation
• Power converters, power supplies, and power conditioning devices
• Automotive, aerospace, and military applications.

Working Principle

The MC78L05ABDR2G operates as an active voltage regulator that uses a two-stage design. The two-stage design consists of an internal series pass element and an error amplifier to regulate the output voltage. The control circuit monitors the output voltage and adjusts the series pass element accordingly. When the output voltage increases, the control circuit increases the series pass element’s duty cycle, thus limiting the output voltage and causing it to drop. Conversely, when the output voltage decreases, the duty cycle is decreased, allowing the output voltage to rise.

This device offers excellent input/output isolation and high ripple rejection, making it an ideal choice for applications that require stable power sources that minimize power loss, minimize heat generation, and reduce system complexity.

Conclusion

The MC78L05ABDR2G is an adjustable, 3-Pin Negative Voltage Regulator with an output voltage range from −1.2 V to −32 V. It is an efficient and reliable linear regulator and is widely used in variety of applications such as medical devices, consumer electronics, audio equipment, power converters, power supplies and more. This device operates as an active voltage regulator using a two-stage design and offers excellent input/output isolation and high ripple rejection, making it an ideal choice for applications that require stable power.