仕様
| 属性 | 値 |
| Package / Case | Tape & Reel (TR),Cut Tape (CT) |
| Series | SIMPLE SWITCHER® |
| Part Status | Obsolete |
| Function | Step-Down |
| Output Configuration | Positive |
| Topology | Buck |
| Output Type | Fixed |
| Number of Outputs | 1 |
| Voltage - Input (Min) | 8V |
| Voltage - Input (Max) | 40V |
| Voltage - Output (Min/Fixed) | 5V |
| Current - Output | 5A |
| Frequency - Switching | 260kHz |
| Synchronous Rectifier | No |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Mounting Type | Surface Mount |
概要
Description
The LM2678SX-5.0 is a high-efficiency step-down voltage regulator designed by Texas Instruments. It is part of the LM2678 series, known for converting a higher input voltage to a lower output voltage with minimal power loss. The "5.0" in its name indicates a fixed output voltage of 5 volts. The device supports an input voltage range from 8V to 40V and delivers an output current of up to 5A, making it suitable for applications requiring a stable 5V supply, such as microcontrollers and digital circuits.
Key features include a high switching frequency of 260 kHz, which allows for the use of smaller external components, thereby reducing the overall size of the power supply design. The LM2678SX-5.0 also includes a thermal shutdown and current limiting for protection against overload and overheating. Its efficiency, typically over 90%, minimizes heat generation and improves reliability. The device is available in a surface-mount TO-263 package, suitable for space-constrained applications. The LM2678 series is well-suited for both industrial and consumer electronics where robust and efficient power regulation is required.
Key features include a high switching frequency of 260 kHz, which allows for the use of smaller external components, thereby reducing the overall size of the power supply design. The LM2678SX-5.0 also includes a thermal shutdown and current limiting for protection against overload and overheating. Its efficiency, typically over 90%, minimizes heat generation and improves reliability. The device is available in a surface-mount TO-263 package, suitable for space-constrained applications. The LM2678 series is well-suited for both industrial and consumer electronics where robust and efficient power regulation is required.
Equivalent
The LM2678SX-5.0 is a step-down voltage regulator. Equivalent products can include:
1. TI LM2596-5.0: Similar step-down regulator with a fixed 5V output.
2. ON Semiconductor MC34063: Offers similar functionality, though may require additional components for equivalent performance.
3. STMicroelectronics L78S05CV: A 5V regulator in a similar package, but with different specifications.
4. Murata OKI-78SR-5/1.5-W36-C: A switching regulator with a 5V output.
Always verify pin compatibility and electrical specifications before substituting.
1. TI LM2596-5.0: Similar step-down regulator with a fixed 5V output.
2. ON Semiconductor MC34063: Offers similar functionality, though may require additional components for equivalent performance.
3. STMicroelectronics L78S05CV: A 5V regulator in a similar package, but with different specifications.
4. Murata OKI-78SR-5/1.5-W36-C: A switching regulator with a 5V output.
Always verify pin compatibility and electrical specifications before substituting.
Features
The LM2678SX-5.0 is a high-efficiency step-down voltage regulator designed to deliver a fixed output voltage of 5.0V. Key features include:
1. High Efficiency: The regulator offers up to 92% efficiency, which minimizes power loss and heat generation.
2. Wide Input Voltage Range: It operates with an input voltage range from 8V to 40V, making it suitable for various applications.
3. Output Current: Capable of delivering up to 5A continuous output current, which is ideal for powering demanding devices.
4. Fixed Output Voltage: The device provides a stable 5.0V output, simplifying design and ensuring consistent performance.
5. Switching Frequency: Operates at a 260 kHz fixed frequency, which optimizes size and performance.
6. Soft-Start Capability: Features a soft-start function to limit inrush current and avoid output voltage overshoot during startup.
7. Thermal Protection: Includes thermal shutdown to protect the device from overheating.
8. Current Limiting: Integrated current limit protection ensures reliability in case of overload conditions.
9. Low Dropout Voltage: The design allows for low dropout operation, enhancing efficiency and usability in various applications.
These features make it suitable for use in industrial, automotive, and computing applications.
1. High Efficiency: The regulator offers up to 92% efficiency, which minimizes power loss and heat generation.
2. Wide Input Voltage Range: It operates with an input voltage range from 8V to 40V, making it suitable for various applications.
3. Output Current: Capable of delivering up to 5A continuous output current, which is ideal for powering demanding devices.
4. Fixed Output Voltage: The device provides a stable 5.0V output, simplifying design and ensuring consistent performance.
5. Switching Frequency: Operates at a 260 kHz fixed frequency, which optimizes size and performance.
6. Soft-Start Capability: Features a soft-start function to limit inrush current and avoid output voltage overshoot during startup.
7. Thermal Protection: Includes thermal shutdown to protect the device from overheating.
8. Current Limiting: Integrated current limit protection ensures reliability in case of overload conditions.
9. Low Dropout Voltage: The design allows for low dropout operation, enhancing efficiency and usability in various applications.
These features make it suitable for use in industrial, automotive, and computing applications.
Pinout
The LM2678SX-5.0 is a step-down voltage regulator with a fixed output voltage of 5.0V. It is part of the LM2678 series by Texas Instruments. The device typically comes in a TO-263 or TO-220 package, which has a pin count of 7.
Here are the functions of each pin:
1. VIN (Pin 1): Input voltage pin where the supply voltage is connected.
2. SW (Pin 2): Switch pin, connected to the inductor and provides the switching signal.
3. GND (Pin 3): Ground pin for the device.
4. FB (Pin 4): Feedback pin, used to set the output voltage. For the fixed 5.0V version, this pin is internally connected.
5. ON/OFF (Pin 5): On/Off control pin. A logic low turns the regulator on, and a logic high turns it off.
6. BOOT (Pin 6): Bootstrap pin that needs a capacitor connected to SW pin to drive the gate of the internal switch.
7. NC (Pin 7): No connection or not used.
This setup allows the LM2678SX-5.0 to efficiently convert higher input voltages to a stable 5.0V output.
Here are the functions of each pin:
1. VIN (Pin 1): Input voltage pin where the supply voltage is connected.
2. SW (Pin 2): Switch pin, connected to the inductor and provides the switching signal.
3. GND (Pin 3): Ground pin for the device.
4. FB (Pin 4): Feedback pin, used to set the output voltage. For the fixed 5.0V version, this pin is internally connected.
5. ON/OFF (Pin 5): On/Off control pin. A logic low turns the regulator on, and a logic high turns it off.
6. BOOT (Pin 6): Bootstrap pin that needs a capacitor connected to SW pin to drive the gate of the internal switch.
7. NC (Pin 7): No connection or not used.
This setup allows the LM2678SX-5.0 to efficiently convert higher input voltages to a stable 5.0V output.
Manufacturer
The LM2678SX-5.0 is manufactured by Texas Instruments (TI). Texas Instruments is an American technology company that designs and manufactures semiconductors and various integrated circuits, which it sells to electronics designers and manufacturers globally. TI is well-known for its development of analog chips and embedded processors, which are widely used in a variety of electronic systems. The company has a strong presence in the electronics industry and provides solutions across various applications, including automotive, industrial, personal electronics, communications equipment, and enterprise systems. Founded in 1930 and headquartered in Dallas, Texas, TI has a significant impact on the semiconductor market and is recognized as a leader in innovation and technological advancement.
Application
The LM2678SX-5.0 is a high-efficiency step-down voltage regulator, ideal for applications requiring a 5V output. It is commonly used in:
1. Embedded Systems: Providing a stable 5V supply for microcontrollers and digital circuits.
2. Consumer Electronics: Powering devices such as set-top boxes and gaming consoles.
3. Industrial Automation: Supplying power to sensors, controllers, and communication modules.
4. Telecommunications: Used in power management for network infrastructure equipment.
5. Automotive: Powering infotainment systems and other electronic modules.
6. Battery-Powered Devices: Extending battery life by efficiently converting higher battery voltages to 5V.
Its high efficiency and low external component count make it suitable for space-constrained applications.
1. Embedded Systems: Providing a stable 5V supply for microcontrollers and digital circuits.
2. Consumer Electronics: Powering devices such as set-top boxes and gaming consoles.
3. Industrial Automation: Supplying power to sensors, controllers, and communication modules.
4. Telecommunications: Used in power management for network infrastructure equipment.
5. Automotive: Powering infotainment systems and other electronic modules.
6. Battery-Powered Devices: Extending battery life by efficiently converting higher battery voltages to 5V.
Its high efficiency and low external component count make it suitable for space-constrained applications.
Package
The LM2678SX-5.0 is a step-down voltage regulator from Texas Instruments and comes in a TO-263 surface-mount package, also known as a D²PAK-7. It is designed for high-efficiency and high-current applications.
