LM2940T-10.0

Current - Output:	1A
Base Part Number:	LM2940
Supplier Device Package:	TO-220-3
Package / Case:	TO-220-3
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity, Short Circuit
Control Features:	--
PSRR:	63dB (120Hz)
Current - Supply (Max):	15mA
Current - Quiescent (Iq):	10mA
Series:	--
Voltage Dropout (Max):	1V @ 1A
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	10V
Voltage - Input (Max):	26V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Not For New Designs
Packaging:	Tube

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LM2940T-10.0 Application Field and Working Principle

The LM2940T-10.0 is a linear voltage regulator from Texas Instruments. It is part of the PMIC (Power Management Integrated Circuit) family, specifically classified as voltage regulators or linear PMICs, and is designed to provide a precise output voltage of 10 volts, over a range of 2.3 to 33V input.The LM2940T-10.0 is ideal for use in applications where precise regulation of the output voltage is important. It offers high-performance features such as low current consumption and high ripple rejection, along with a wide range of protection features. It is also suitable for use in high-noise, high-temperature environments, due to its high-temperature operation and its built-in thermal protection.

Application Fields

The LM2940T-10.0 voltage regulator is most commonly used in industrial and telecommunications applications, where precise voltage regulation is essential. It is also used in low-power applications such as notebooks, cellular phones, and portable instruments. Furthermore, its small size and low cost make it attractive for consumer-grade applications such as remote controllers, toys, and video game consoles.

Working Principle

The LM2940T-10.0 voltage regulator works by comparing an internal reference voltage, known as the feedback voltage, to the output voltage of the circuit. When the output voltage is higher than the feedback voltage, the regulator increases the resistance of the controlling transistor, lowering the output voltage until it matches the reference voltage. Conversely, when the output voltage is lower than the reference voltage, the regulator decreases the resistance of the controlling transistor, raising the output voltage until it matches the reference voltage. In this way, the LM2940T-10.0 is able to maintain a precise output voltage regardless of changes in the input voltage, load current, or temperature.

Protection Features

The LM2940T-10.0 voltage regulator is equipped with several important protection features. These include an input over-voltage protection function, which shuts down the output when the input voltage exceeds 33V, and an output over-voltage protection, which shuts down the output when the output voltage exceeds 10.5V. Other protection features include a short-circuit protection, which shuts down the output when the output voltage is short-circuited, and a thermal protection, which shuts down the output when the temperature of the regulator exceeds the maximum allowable temperature.

Conclusion

The LM2940T-10.0 voltage regulator is a highly precise and reliable voltage-regulating device, making it ideal for use in a wide range of applications which require an accurate and consistent output voltage. Its numerous protection features guarantee maximum safety and reliability.

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