L79L05ABD

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Output Configuration:	Negative
Output Type:	Fixed
Number of Regulators:	1
Voltage - Input (Max):	-30V
Voltage - Output (Min/Fixed):	-5V
Voltage - Output (Max):	--
Voltage Dropout (Max):	--
Current - Output:	100mA
Current - Quiescent (Iq):	5.5mA
Current - Supply (Max):	6mA
PSRR:	49dB (120Hz)
Control Features:	--
Protection Features:	Over Temperature, Short Circuit
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	8-SO
Base Part Number:	L79L05

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IntroductionThe L79L05ABD is a three-terminal negative voltage regulator with low dropout voltage, excellent line and load regulation, and very low dropout voltage. This particular voltage regulator is widely used in car radios, personal stereos, and other audio equipment. This device ensures the output voltage remains constant even when the input voltage varies.ApplicationsThe L79L05ABD is primarily used in automotive, commercial, and industrial electronic systems including car radios, personal stereos, amplifiers and other audio systems, computer peripherals, and industrial control systems. It is also used in medical equipment and consumer electronics such as digital cameras, portable music players, and other consumer audio devices.FeaturesThe key features of the L79L05ABD voltage regulator are its low output voltage, low quiescent current, high input/output accuracy, and wide input/output voltage range. It also has an output current limitation, thermal overload protection, and short circuit protection. This device has a wide voltage range of 2.2V to 25V with a rated output of -5.0V and ±4.0% output voltage accuracy. The short circuit current is limited to 10mA and the output current is limited to 100mA. The device also has an output impedance of 12mΩ.Working PrincipleThe L79L05ABD operates according to a simple two-transistor circuit. It includes a pass transistor and a voltage reference. The pass transistor provides the current necessary to keep the output voltage steady, while the voltage reference keeps the output voltage constant even when the input voltage varies. When input voltage is applied, the voltage reference turns on the pass transistor, which draws a current proportional to the input voltage. This current is converted to an output voltage which is regulated by the voltage reference. As long as the input voltage is within the rated range, the output voltage will remain the same. If the input voltage overshoots the device’s rated range, the current limitation feature of the L79L05ABD will kick in and prevent excessive current to flow through the device. This prevents the device from becoming damaged due to excessive current. The device also has thermal overload protection which shuts down the device if the internal temperature reaches beyond a certain point.ConclusionThe L79L05ABD is a three-terminal negative voltage regulator with excellent line and load regulation, low dropout voltage, and excellent accuracy. It is most often used in car radios, personal stereos, amplifiers and other audio systems, computer peripherals, and industrial control systems. The device operates according to a simple two-transistor circuit and has features such as current limitation, thermal overload protection, and short circuit protection. These features make the L79L05ABD an ideal choice for any application where a constant, low-dropout output voltage is required.

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