LM2940CT-12

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LM2940CT-12

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IC REG LINEAR 12V 1A TO220-3

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  • メーカー品番 #LM2940CT-12

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仕様

属性 値
Part Status Obsolete
Base Product Number LM2940
Output Configuration Positive
Output Type Fixed
Number of Regulators 1
Voltage - Input (Max) 26V
Voltage - Output (Min/Fixed) 12V
Voltage Dropout (Max) 0.8V @ 1A
Current - Output 1A
Current - Quiescent (Iq) 10 mA
Current - Supply (Max) 15 mA
PSRR 66dB (120Hz)
Protection Features Over Current, Over Temperature, Reverse Polarity, Short Circuit
Operating Temperature 0°C ~ 125°C
Mounting Type Through Hole
Package TO-220-3
Supplier Device Package TO-220-3
Packaging Tube

概要

Description

The LM2940CT-12 is a low dropout voltage regulator designed to provide a stable 12V output from a higher voltage input, with a maximum output current of 1A. It features a low dropout voltage of approximately 0.5V at full load, making it suitable for applications where input-output voltage differential is minimal. The device includes an internal current limiting and thermal shutdown feature for protection against overload and overheating.
The LM2940CT-12 is known for its low quiescent current, which makes it efficient for battery-powered applications. It also has excellent line and load regulation, ensuring a stable output voltage despite variations in input voltage or output load. The package is typically a TO-220, which provides good heat dissipation.
This regulator is widely used in automotive, industrial, and consumer electronics for its reliability and efficiency. It requires a few external components, typically a small input capacitor and a larger output capacitor, to ensure stability and optimal performance.

Equivalent

The LM2940CT-12 is a low dropout voltage regulator. Equivalent products include the MC33269T-12, L78M12CD2T-TR, LT1086CT-12, and KA78M12. While selecting an equivalent, ensure parameters like output voltage, current rating, dropout voltage, and package type match your application's requirements. Always verify compatibility with the datasheets of the specific components.

Features

The LM2940CT-12 is a voltage regulator known for its low dropout voltage and reliable performance. Key features include:
1. Output Voltage: Fixed 12V output.
2. Low Dropout Voltage: Typically 0.5V at 1A, enabling efficient operation with minimal input-output voltage differential.
3. High Current Capability: Can deliver up to 1A of output current.
4. Low Quiescent Current: Low standby current of about 10mA, making it energy-efficient.
5. Thermal Protection: Built-in thermal shutdown to prevent overheating.
6. Short Circuit Protection: Safeguards against short circuits, ensuring reliability.
7. Reverse Polarity Protection: Protects the device if the input voltage is accidentally reversed.
8. Stability: Requires only a small output capacitor for stability.
9. Package: Available in TO-220 package, suitable for heat dissipation.
These features make the LM2940CT-12 ideal for applications requiring stable 12V output with high efficiency and protection mechanisms.

Pinout

The LM2940CT-12 is a low dropout voltage regulator with a fixed output of 12V. It comes in a TO-220 package and typically has 3 pins:
1. Input (Pin 1): This is where the unregulated input voltage is applied. It should be higher than 12V to ensure proper regulation.
2. Ground (Pin 2): This pin is the common ground for both input and output, and it is used to complete the circuit.
3. Output (Pin 3): This pin provides the regulated 12V output.
The LM2940CT-12 is designed for applications requiring a stable 12V output with low dropout voltage, making it suitable for battery-powered systems. It features low quiescent current and is capable of delivering up to 1A of output current.

Manufacturer

The LM2940CT-12 is typically manufactured by Texas Instruments, a well-known company in the semiconductor industry. Texas Instruments is an American technology company that designs and manufactures semiconductors and various integrated circuits, which are used in applications ranging from consumer electronics to industrial equipment. The company is one of the largest semiconductor suppliers globally and is known for producing a wide range of analog and embedded processing products.

Application

The LM2940CT-12 is a low dropout voltage regulator commonly used in applications that require stable 12V DC output with low input voltage and high efficiency. Key application areas include automotive electronics, where it powers sensors and control units; consumer electronics, for powering devices like set-top boxes and routers; industrial equipment, where stable voltage is crucial for operation; and communication devices, ensuring reliable power supply to modems and telemetry units. Its low dropout voltage and thermal protection also make it suitable for battery-powered applications, ensuring extended battery life and device reliability.

Package

The LM2940CT-12 is a voltage regulator that comes in a TO-220 package. The "CT" in the part number indicates the TO-220 package type, which is a common package for power transistors and voltage regulators due to its ability to handle relatively high power levels and ease of mounting onto heat sinks.

Frequently Asked Questions


Q: What is the maximum input voltage for the LM2940CT-12?
A: The maximum input voltage is 26V, ensuring stable 12V output under this limit.


Q: What is the dropout voltage of this regulator at 1A load?
A: The maximum dropout voltage is 0.8V at 1A output, allowing efficient low headroom operation.


Q: What protection features are included in the LM2940CT-12?
A: It includes over current, over temperature, reverse polarity, and short circuit protection for robust design.


Q: What is the quiescent current for this device?
A: The typical quiescent current is 10 mA, with a maximum supply current of 15 mA.


Q: What is the operating temperature range of the LM2940CT-12?
A: It operates from 0°C to 125°C, suitable for industrial and automotive environments.


Q: What package type does the LM2940CT-12 come in?
A: It comes in a standard TO-220-3 through-hole package, ideal for heatsinking and prototyping.


Q: Can the LM2940CT-12 be used for negative voltage outputs?
A: No, it provides a fixed positive 12V output; for negative outputs, use a negative regulator.


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