SPX3940AM3-L-3-3/TR

Voltage Dropout (Max):	0.55V @ 1A
Supplier Device Package:	SOT-223
Package / Case:	TO-261-4, TO-261AA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity, Short Circuit, Transient Voltage
Control Features:	--
PSRR:	--
Current - Output:	1A
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	3.3V
Voltage - Input (Max):	16V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The SPX3940AM3-L-3-3/TR is a linear voltage regulator developed by Power Integrations, Inc. It is designed to provide a stable 3.3V output voltage with good efficiency in a wide range of applications. The regulator can be used in low-power electronics, such as laptop computers, medical devices, and instrumentation. It also has excellent thermal performance, allowing it to be used in a wider range of applications than other linear voltage regulators.

Features & Benefits

The SPX3940AM3-L-3-3/TR is designed with a wide operating temperature range (from -40°C to +85°C), making it suitable for a variety of applications. The regulator is also designed to be over-current protected, which enables it to withstand overloads without damage. The regulator also has a wide voltage input range (8V to 18V), allowing it to be used with a broad range of power sources.The SPX3940AM3-L-3-3/TR also offers excellent efficiency, allowing it to reduce heat generation, power consumption, and component size. The regulator is also designed with Superior Line Regulation, guaranteeing it will maintain a very stable output voltage even under load.The SPX3940AM3-L-3-3/TR also features a low dropout (LDO) design, allowing it to regulate an output voltage that is close to the input voltage. This feature makes the regulator highly efficient and reduces power loss.

Applications

The SPX3940AM3-L-3-3/TR can be used in a wide range of applications, such as low-power electronics, medical devices, instrumentation, and more. The regulator is also suitable for use in automotive and industrial controls, such as current controllers and lighting dimmers.The SPX3940AM3-L-3-3/TR is also suitable for powering sensitive electronics, such as radio frequency (RF) equipment and digital signal processors (DSPs).

Working Principle

The SPX3940AM3-L-3-3/TR is a linear voltage regulator which operates on the principle of series regulation. It consists of an internal power transistor, which is connected between the input and the output. The transistor acts as a variable resistor, which is controlled by an internal control signal.The power transistor is connected to the internal control signal through a feedback loop. The feedback loop is responsible for monitoring the output voltage and adjusting the resistance of the power transistor accordingly. When the output voltage is higher than the desired value, the feedback loop will reduce the resistance of the power transistor, thereby reducing the output voltage and bringing it closer to the desired value. Similarly, if the output voltage is lower than the desired value, the feedback loop will increase the transistor’s resistance and raise the output voltage.The SPX3940AM3-L-3-3/TR also features an operational amplifier, which helps to improve the accuracy of the voltage regulation. The operational amplifier amplifies the difference between the desired voltage and the measured output voltage, allowing the feedback loop to make more precise adjustments.

Conclusion

The SPX3940AM3-L-3-3/TR is a linear voltage regulator which is designed for a wide range of applications, such as laptop computers, medical devices, and industrial controls. It features excellent thermal performance, over-current protection, and superior line regulation, which guarantees a stable output voltage. The regulator also offers excellent efficiency and a low dropout design, which helps reduce power loss. The SPX3940AM3-L-3-3/TR operates on the principle of series regulation, with an internal power transistor and feedback loop to continually monitor and adjust the output voltage.

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