LM317LZX Integrated Circuits (ICs)

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Output Configuration:	Positive
Output Type:	Adjustable
Number of Regulators:	1
Voltage - Input (Max):	40V
Voltage - Output (Min/Fixed):	1.2V
Voltage - Output (Max):	37V
Voltage Dropout (Max):	--
Current - Output:	100mA
PSRR:	80dB (120Hz)
Control Features:	--
Protection Features:	Over Temperature, Short Circuit
Operating Temperature:	0°C ~ 125°C
Mounting Type:	Through Hole
Package / Case:	TO-226-3, TO-92-3 (TO-226AA) (Formed Leads)
Supplier Device Package:	TO-92-3
Base Part Number:	LM317

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LM317LZX Application Field and Working Principle

PMIC - Voltage Regulators - Linear

The LM317LZX is one of the modern Voltage Regulators designed to regulate the output voltage of the DC power supply of any mobile communications, automotive, consumer and industrial equipment. With its very low quiescent current and immensely low dropout voltage, the LM317LZX regulator can easily be used for battery-operated applications and for other space-limited circuits.This Voltage Regulator is a three-terminal adjustable regulator from National Semiconductor. It is an adjustable version of the well-known LM317 linear voltage regulator. The LM317LZX has the ability to provide an output voltage spectrum ranging from 1.2V to 37V with a maximum current rating of 1.5 Amps. It also has a fixed output voltage of 3.0V, 5.0V and 12V.

Features of the LM317LZX Regulator

The LM317LZX Voltage Regulator has many features which make it an excellent choice for powering microelectronic devices. Its salient features include:• High Efficiency: with a maximum efficiency rating of 90%, the LM317LZX can provide efficient and reliable power.• Ultra-Low Quiescent Current: the LM317LZX regulator can keep the quiescent current to less than 1 milliamp (mA), making it ideal for battery-powered applications.• Low Dropout Voltage: The LM317LZX has the ability to efficiently provide low dropout voltages of up to 1.2V.• Wide Output Voltage Range: It can provide a wide output voltage spectrum ranging from 1.2V to 37V.• Thermal Protection: Its on-chip circuitry facilitates thermal protection, thus preventing the regulator from being damaged due to the excessive heat generated by the other components.

Working Principle of the LM317LZX

The LM317LZX regulator’s working principle can be divided into two parts. The first part is the feedback circuit and the second part is the output stage.In the first part, the input voltage is applied to the LM317LZX regulator through the Input/Adj terminals. The internal feedback network adjusts this input voltage according to the user’s desired output voltage. This is then sent to the output stage.In the output stage, the output voltage is generated by a combination of an error amplifier and a pass transistor. The error amplifier compares the output voltage with a reference voltage of 1.25V, and adjusts the transistor’s output current accordingly. This output current is then passed through an output transistor which produces the regulated output voltage.

Applications of LM317LZX Voltage Regulator

The LM317LZX regulator is ideal for use in many applications due to its high efficiency, low quiescent current and high current output. Some of the most common applications include:• Mobile phones• Portable navigation systems• Consumer electronics• Automotive applications• Industrial equipment• Computer peripherals• Robotics• LEDs• Medical equipment

Conclusion

The LM317LZX Voltage Regulator is a highly efficient and reliable three-terminal adjustable linear voltage regulator. With its very low quiescent current, low dropout voltage and ultra-wide output voltage spectrum, it is the perfect choice for powering microelectronic devices. Its applications range from mobile phones, automotive equipment, consumer electronics and industrial equipment to medical equipment, LED lighting and robotics.

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