LP3855ET-1.8/NOPB

Current - Output:	1.5A
Base Part Number:	LP3855
Supplier Device Package:	TO-220-5
Package / Case:	TO-220-5 Formed Leads
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Short Circuit
Control Features:	Enable
PSRR:	73dB ~ 57dB (120Hz)
Current - Supply (Max):	10mA
Current - Quiescent (Iq):	3mA
Series:	--
Voltage Dropout (Max):	0.38V @ 1.5A
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	1.8V
Voltage - Input (Max):	7V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tube

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Introduction
The LP3855ET-1.8/NOPB is a low dropout linear voltage regulator designed by Texas Instruments. It is a two-terminal device with a wide input voltage range and low output operating current, making it ideal for use in a variety of power supply applications. Its ability to provide a precise, regulate output voltage makes it suitable for a number of applications such as portable and computer devices, printers, digital cameras, and other consumer electronics. In this article, we will discuss the application field and working principle of the LP3855ET-1.8/NOPB linear voltage regulator.Application Field
LP3855ET-1.8/NOPB is widely used in a number of consumer electronics due to its high efficiency and low on-state resistance. It is suitable for applications with input voltages ranging from 2.4V to 6.5V, allowing for operation from a variety of DC sources. Due to its low quiescent current, the regulator can operate for long periods of time without draining too much power.The LP3855ET-1.8/NOPB voltage regulator can output a maximum voltage of 1.8V, making it ideal for applications such as printers and other consumer electronics with high power requirements. Additionally, the device features a dropout voltage of only 0.37V at its maximum output current which makes it ideal for low-voltage output applications.Working Principle
The LP3855ET-1.8/NOPB linear voltage regulator is designed to maintain an output voltage that remains constant despite changes in the load and input voltage. To achieve this, the regulator uses a Zener diode to set the reference voltage and a transistor to control the current output from a source to the load.When the input voltage increases, current from the source is allowed to flow through the resistor, which increases the voltage across the transistor\'s gate. This results in the transistor allowing more current to flow from the source to the load, thereby maintaining a constant output voltage. Similarly, when the input voltage decreases, the transistor limits the current from the source, suppressing the voltage at the gate and thus decreasing the amount of current flowing from the source to the load and maintaining a constant output voltage.Conclusion
The LP3855ET-1.8/NOPB linear voltage regulator is a two-terminal device designed to provide precise and regulated output voltages for a wide variety of applications, such as portable and computer devices, printers, digital cameras, and other consumer electronics. It has a wide input voltage range, low operating current, and dropout voltage, making it suitable for low-voltage power supply applications. Its precise voltage regulation mechanism, which utilizes a Zener diode and a transistor, facilitates the maintenance of a constant voltage output regardless of input voltage fluctuations.

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