LD1117AS12TR Integrated Circuits (ICs)

Current - Output:	1A
Base Part Number:	LD1117A
Supplier Device Package:	SOT-223
Package / Case:	TO-261-4, TO-261AA
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 125°C
Protection Features:	Over Current, Over Temperature
Control Features:	--
PSRR:	80dB (120Hz)
Current - Quiescent (Iq):	10mA
Series:	--
Voltage Dropout (Max):	1.3V @ 1A
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	1.2V
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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Introduction

The LD1117AS12TR is a low-dropout linear regulator designed for general use in a wide range of applications where low power consumption and low noise reduction are critical. It is a three-terminal, adjustable voltage regulator with an output voltage range of 1.25V to 12V and a maximum output current of 500mA. This regulator has a good ripple rejection, and its short-circuit protection, thermal shutdown, and over-current protection ensure the stability of the system. Moreover, the LD1117AS12TR has excellent stability and low temperature coefficient for better performance.

Application Fields

The LD1117AS12TR is a widely used voltage regulator with a wide range of applications. It\'s idea for a variety of electronics applications such as mobile phones, routers, wearables, portable game consoles, and other electronic devices. The regulator can be used in battery-powered handheld devices where power conservation is critical.The regulator can also be used in applications that require very low noise such as computers, networks, audio equipment, and other sensitive systems. Its low noise level makes it ideal for these types of applications.The LD1117AS12TR can also be used in automotive systems such as electric power steering where robust and efficient voltage regulation is required. Its output current capability of 500mA makes it suitable for high power applications.

Working Principle

The LD1117AS12TR consists of two major components; the error amplifier and the series pass transistor. The error amplifier compares the reference voltage to the actual output voltage and adjusts the output voltage regulation accordingly.When the output voltage is lower than the reference voltage, the error amplifier will dissipate power to the series pass transistor to increase the output current. When the output voltage exceeds the reference voltage, the error amplifier will reduce the power dissipation of the series pass transistor in order to reduce the output current.By controlling the power dissipated to the series pass transistor, the error amplifier can accurately control the output voltage. This ensures that the regulator maintains a stable output voltage despite changes in line and load conditions.

Conclusion

The LD1117AS12TR is a 3-Terminal adjustable linear voltage regulator with an output voltage range of 1.25V to 12V. Its low dropout voltage, excellent ripple rejection, and very low noise make it an ideal regulator for applications demanding power conservation, low noise, and robust voltage regulation. The error amplifier control of this regulator ensures excellent line and load regulations and makes it suitable for a wide variety of applications.

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