Current - Output:	1A
Base Part Number:	REG1117A-18
Supplier Device Package:	SOT-223-4
Package / Case:	TO-261-4, TO-261AA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature
Control Features:	--
PSRR:	62dB (120Hz)
Current - Quiescent (Iq):	10mA
Series:	--
Voltage Dropout (Max):	1.55V @ 1A
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	1.8V
Voltage - Input (Max):	15V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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REG1117A-1.8/2K5 Application Field and Working Principle

Introduction

The REG1117A-1.8/2K5 is a low-dropout (LDO) linear voltage regulator with output current up to 1.8A and 5V output voltage. It provides a high-precision voltage regulation, low-cost power supply, and significant power savings capability for low voltage applications. It offers enhanced product characteristics such as higher immunity to both noise and power supply transients. This device has many additional features such as thermal shutdown, active pull-up current, fast transient response, and external voltage adjust.

Application Field

The REG1117A-1.8/2K5 is an ideal choice for powering low voltage applications such as portable electronic devices. It provides a very high level of voltage accuracy in order to maintain the robustness of the system’s circuitry. This device is an excellent choice for Low Drop-Out (LDO) applications as it has low thermal resistance and low power consumption. It can be used in a variety of battery operated devices such as laptop computers, cell phones, portable radio and digital audio players, and digital cameras.

Working Principle

The REG1117A-1.8/2K5 employs a linear voltage regulation principle. It works by controlling a series resistor connected between the input and output terminals. By adjusting the resistance, the device is able to precisely regulate the output voltage.The device is designed to compensate for changes in line voltage and current and maintain a constant output voltage. It utilizes an error amplifier, a reference source, and an output control transistor to keep the output voltage constant. The error amplifier compares the input voltage to the set point voltage. If there is a difference between the two, the amplifier produces an output voltage proportional to the difference between them. The reference source then provides a stable reference voltage and the output control transistor is used to regulate the output voltage according to the output of the error amplifier.

Conclusion

The REG1117A-1.8/2K5 is an efficient, cost-effective linear voltage regulator ideal for low voltage applications. It provides a high level of voltage accuracy and robustness while also offering low thermal resistance and low power consumption. This device is a great choice for applications that require high precision and reliable power supplies.

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