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LM338K
+NomenclatureIC REG LINEAR POS ADJ 5A TO3
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FabricantSemi - conducteurs optiques
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Pièce fabricant #LM338K
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Fiche technique LM338K DataSheet
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En stock2394
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Spécifications
| Attribut | Valeur |
| Part Status | Obsolete |
| Base Product Number | LM338 |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Number of Regulators | 1 |
| Voltage - Input (Max) | 35V |
| Voltage - Output (Min/Fixed) | 1.2V |
| Voltage - Output (Max) | 32V |
| Current - Output | 5A |
| PSRR | 75dB ~ 60dB (120Hz) |
| Protection Features | Over Current, Over Temperature |
| Operating Temperature | 0°C ~ 125°C |
| Mounting Type | Through Hole |
| Package | TO-204AA, TO-3 |
| Supplier Device Package | TO-3 |
| Packaging | Tube |
Présentation
Description
The LM338K features internal current limiting and thermal overload protection, making it robust for various applications, including battery chargers, power supplies, and other electronic devices requiring regulated voltage.
To set the output voltage, external resistors are used, allowing for precise voltage adjustments based on application needs. The device operates over a wide input voltage range, typically up to 40V, and can function in both linear and switching power supply configurations.
The LM338K is packaged in a TO-220 form factor, facilitating heat dissipation. Its versatility and reliability make it a popular choice among engineers and hobbyists alike.
Equivalent
Features
1. Adjustable Output Voltage: It can deliver an output voltage from 1.25V to 37V, making it versatile for various applications.
2. Current Output: Capable of supplying up to 5A of output current, suitable for powering many devices.
3. Dropout Voltage: The device has a low dropout voltage, typically around 1.5V at full load, ensuring efficient operation.
4. Thermal Protection: It includes internal thermal limiting to prevent overheating, enhancing reliability.
5. Short-Circuit Protection: The LM338K provides built-in protection against short circuits, safeguarding both the regulator and the connected load.
6. Ease of Use: The device is simple to use with a few external components for voltage adjustment.
7. Wide Operating Range: It operates with an input voltage of up to 40V.
These features make the LM338K suitable for applications in power supplies, battery chargers, and other electronic circuits requiring stable voltage regulation.
Pinout
1. Input (Pin 1): This pin receives the unregulated input voltage. It must be higher than the output voltage by at least the dropout voltage for proper regulation.
2. Adjust (Pin 2): This pin is used to set the output voltage using external resistors. By connecting a resistor network, you can obtain a desired output voltage ranging from 1.25V to 37V.
3. Output (Pin 3): This pin delivers the regulated output voltage to the load.
4. Tab/Heatsink (Pin 4): This is the tab of the package and is internally connected to the output. It can be used for heat dissipation.
5. Ground (Pin 5): This pin is the common reference point for the input and output voltages.
The LM338K is commonly used in power supply applications due to its adjustable output and high current capability (up to 5A).
Manufacturer
TI primarily serves markets such as automotive, industrial, and consumer electronics, providing solutions for applications ranging from power management to signal processing. The company is headquartered in Dallas, Texas, and has a significant presence in research and development, allowing it to stay at the forefront of technology advancements.
The LM338K itself is a popular adjustable voltage regulator, capable of supplying up to 5A of output current, making it suitable for various power supply applications. TI's focus on quality and reliability has established it as a leader in the semiconductor industry.
Application
1. Power Supply Circuits: Providing adjustable output voltage for power supplies.
2. Battery Chargers: Regulating voltage for charging batteries safely.
3. Test Equipment: Supplying stable voltage in laboratory instruments.
4. Embedded Systems: Powering microcontrollers and sensors in embedded applications.
5. LED Drivers: Controlling the voltage for LEDs to ensure consistent brightness.
6. Audio Equipment: Regulating power for audio amplifiers and other components.
7. Telecommunication Equipment: Providing stable voltages in communication devices.
Its ability to handle high current and adjustable output makes it suitable for diverse electronic designs.
Package
Frequently Asked Questions
Q: What is the maximum output current of the LM338K?
A: The LM338K can deliver a maximum output current of 5A, making it suitable for medium-power adjustable voltage regulation.
Q: What is the input voltage range for this regulator?
A: The maximum input voltage is 35V, and the adjustable output ranges from 1.2V to 32V, ensuring a 3V dropout margin.
Q: Does the LM338K include built-in protection features?
A: Yes, it features over-current and over-temperature protection, enhancing reliability in demanding applications.
Q: What package type is the LM338K available in?
A: It comes in a TO-3 (TO-204AA) through-hole metal can package, which offers excellent thermal dissipation for high-current loads.
Q: What is the PSRR performance of the LM338K?
A: The PSRR is 75dB to 60dB at 120Hz, providing good ripple rejection for sensitive analog or audio circuits.
Q: Can this regulator operate at temperatures below 0°C?
A: No, its specified operating temperature range is 0°C to 125°C, so it is not rated for sub-zero environments.
Q: Is the LM338K still in production?
A: No, its part status is marked as Obsolete. Consider it for legacy designs or while existing stock lasts.
