L78L05ACZ-AP

Current - Output:	100mA
Base Part Number:	L78L05A
Supplier Device Package:	TO-92-3
Package / Case:	TO-226-3, TO-92-3 (TO-226AA) (Formed Leads)
Mounting Type:	Through Hole
Operating Temperature:	0°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Short Circuit
Control Features:	--
PSRR:	49dB (120Hz)
Current - Supply (Max):	6mA
Current - Quiescent (Iq):	5.5mA
Series:	--
Voltage Dropout (Max):	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	5V
Voltage - Input (Max):	30V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Box (TB)

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PMIC - Voltage Regulators - Linear: L78L05ACZ-AP application field and working principle

The L78L05ACZ-AP is a Linear, Positive Voltage regulator from the family of Low Dropout Voltage (LDO) regulators. It is designed for applications needing excellent ripple rejection and low output noise, like Pre-amplifiers and high-speed logic gates. This device is an extended version of the L78L05ACZ, requiring a lower input voltage and providing better thermal stability of the output voltage.

Features of the L78L05ACZ-AP

The L78L05ACZ-AP offers the following features – 1. Output Voltage range of 5V ±2%. 2. Maximum Output Current of 100mA. 3. Low Dropout Voltage of 1.5V Max @ 100mA. 4. Low Quiescent Current of 2mA Max. 5. Output Noise Voltage of 40mVpp Max @ 10Hz - 100KHz. 6. High Ripple Rejection of 70dB Min @ 100KHz.

Application Fields

The L78L05ACZ-AP voltage regulators are mainly used for post regulation in computer and telecommunications systems, as well as for low-power DC to DC converters. Its low dropout voltage ensures high efficiency and its optimal skills in ripple rejection makes them suitable for use in audio applications.It is also suitable for use in high power LED modules and medical devices, car audio systems, robotics, and other circuits requiring low output noise voltage.

Working Principle

The L78L05ACZ-AP works as a voltage regulator by controlling the output voltage by regulating the difference between the input supply and the output voltage. It consists of an error amplifier, an adjustable current source, a transistor and a voltage reference.The error amplifier senses the difference between the input voltage and the output voltage, and drives the current source so that the output voltage is equal to the input voltage. If the input voltage drops below the desired output voltage, the output voltage is also regulated to keep it constant.The adjustable current source regulates the current flowing from the input voltage to the output to keep the output voltage constant even when the input voltage is changing. It is typically set at around 3mA. The transistor is used to control the current flow from the input to the output, and also provides current amplification, making it possible to increase the output current when the load increases. The voltage reference provides the regulation voltage that the output voltage is compared against, ensuring accurate regulation of the output voltage.

Conclusion

The Linear L78L05ACZ-AP is a Voltage Regulator that is especially designed for applications needing excellent ripple rejection and low output noise. It can be used in various applications such as computers, telecommunications and medical devices and has a wide variety of features that make it suitable for these applications. The L78L05ACZ-AP is a voltage regulator that works by comparing the input voltage to the output voltage, and controlling the current source to regulate the output voltage to the desired level.

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