L4949DG

Current - Output:	100mA
Base Part Number:	L4949
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Temperature, Short Circuit
Control Features:	Reset
PSRR:	--
Current - Supply (Max):	5mA
Current - Quiescent (Iq):	260µA
Series:	--
Voltage Dropout (Max):	0.5V @ 100mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	5V
Voltage - Input (Max):	28V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tube

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Introduction

L4949DG is a linear voltage regulator with adjustable spot voltage accuracy, high output current capacity, ultra-low standby current and low operating temperature. Its application field and working principle are widely used in the design and development of modern electronic equipment.

Application Field

L4949DG is widely used in a variety of electronic applications due to its adjustable output voltage accuracy, high output current capacity, ultra-low standby current, high power efficiency and low operating temperature. Its application field mainly include personal computers, digital media players, LCD monitors, smartphones, power banks, automobiles, home appliances, networking equipment and medical equipment.

Computers & Digital Media Players

L4949DG can be used to stabilize the input voltage in personal computers and digital media players. In most cases, it is connected between the power supply and the motherboard so that it can provide steady and consistent electrical inputs to ensure that the equipment continually operates in optimal condition. In addition, it can also protect the computer and digital media players by preventing sudden power surge or fluctuation when unexpected changes happen.

LCD Monitors & Smartphones

L4949DG can also be used in LCD monitors and smartphones, where the main purpose is to regular and stabilize the input voltage so that the device can receive consistent and reliable electrical supplies. By having a steady voltage, the display of LCD monitors would appear more vivid and clear, and the operation of the smartphone can be enhanced for better performance.

Power Banks, Automobiles, Home Appliances, Networking Equipment and Medical Equipment

Apart from computers, digital media players, LCD monitors and smartphones, L4949DG can also be used in other electronic or electrical devices such as power banks, automobiles, home appliances, networking equipment and medical equipment. It is used in these places for the same purpose, which is to regular and stabilize the input voltage.

Working Principle

The working principle of L4949DG can be broken down into four major steps.First, the output voltage is adjusted by a trimmer located in the device. The trimmer uses external voltage to adjust the reference voltage of an internal error amplifier. The value of the reference voltage can be preset by the designer depending on the operating environment and application of the device.Second, the output voltage is compared to the internal reference voltage using the internal error amplifier. If there is a difference, the error amplifier will send an error signal to the output transistor for compensation.Third, the output transistor receives the amplification signal from the error amplifier and adjusts the voltage supplied to the load according to the error signal. This ensures that the voltage of the output device is always within the tolerance of the application. Finally, the regulation process is completed and the output voltage is maintained at the preset level.

Conclusion

In conclusion, L4949DG is a linear voltage regulator with adjustable output voltage accuracy, high output current capacity, ultra-low standby current, high power efficiency and low operating temperature. Its application field mainly include personal computers, digital media players, LCD monitors, smartphones, power banks, automobiles, home appliances, networking equipment and medical equipment. The working principle of the device is that it adjusts the output voltage by a trimmer, compares it to the internal reference voltage, adjusts the voltage supplied to the load and maintains the output voltage at the preset level.

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