UA78L08CD

Voltage Dropout (Max):	1.7V @ 40mA
Base Part Number:	UA78L08
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity, Short Circuit
Control Features:	--
PSRR:	46dB (120Hz)
Current - Output:	100mA
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	8V
Voltage - Input (Max):	23V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tube

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Introduction to UA78L08CD

The UA78L08CD is a low dropout (LDO) fixed voltage single output positive regulator IC. It is part of a family of linear voltage regulators manufactured by Fairchild Semiconductor Corporation, and is especially popular for its low dropout and low noise operation.The UA78L08CD has an internally set minimum dropout voltage that yields a high level of output current. This feature allows it to be used with a wide range of input voltages, making it suitable for applications that require low dropout, such as portable devices and other battery-powered systems.

Applications of UA78L08CD

The UA78L08CD is commonly used in communications, consumer, industrial and automotive applications. Some of its most common applications are:

• AC-DC Converters - The UA78L08CD can be used in switch mode power supplies to provide a steady voltage output over a wide input voltage range.
• Charging Equipment - The UA78L08CD can be used in charging circuits to provide a constant voltage to a battery.
• Audio Equipment -The UA78L08CD can be used in audio amplifiers to provide a low noise power supply.
• Medical Equipment - The UA78L08CD can be used in medical applications where low dropout is important for patient safety.

Working Principle of the UA78L08CD

The UA78L08CD operates using a linear voltage regulator principle. When the input voltage is higher than the regulated output voltage, the UA78L08CD begins to draw a current from the input line. This current is then passed through an internal voltage regulating transistor, which produces a stable output voltage.The UA78L08CD uses an internal bandgap reference voltage to set the output voltage and an internal reference current to set the dropout voltage. An error amplifier is used to maintain the reference voltage and current. A pass transistor is used to control the output current. The UA78L08CD also features an internal short-circuit current limit, thermal shutdown and overvoltage protection.

Conclusion

The UA78L08CD is a versatile low dropout voltage regulator IC from Fairchild Semiconductor Corporation. It has a wide range of applications, including AC-DC converters, charging equipment, audio equipment and medical equipment. It operates using a linear voltage regulator principle, and features an internal bandgap reference voltage, reference current, error amplifier, pass transistor and other protection features.

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