規格
| 屬性 | 價值 |
| Package | Tape & Reel (TR),Cut Tape (CT) |
| Series | SIMPLE SWITCHER® |
| ProductStatus | Not For New Designs |
| Function | Step-Down |
| OutputConfiguration | Positive |
| Topology | Buck |
| OutputType | Adjustable |
| NumberofOutputs | 1 |
| Voltage-Input(Min) | 8V |
| Voltage-Input(Max) | 40V |
| Voltage-Output(Min/Fixed) | 1.21V |
| Voltage-Output(Max) | 37V |
| Current-Output | 5A |
| Frequency-Switching | 260kHz |
| SynchronousRectifier | No |
| OperatingTemperature | -40°C ~ 125°C (TJ) |
| MountingType | Surface Mount |
| Package/Case | TO-263-8, D²Pak (7 Leads + Tab), TO-263CA |
概述
Description
The LM2678SX-ADJ is a versatile step-down (buck) DC-DC converter designed by Texas Instruments. It operates with a high-efficiency switching regulator, capable of delivering an adjustable output voltage. This device is particularly useful for applications requiring efficient power management from a variety of input voltage sources, ranging from 8V to 40V. The LM2678SX-ADJ supports output currents up to 5A, making it suitable for moderate power applications.
Key features include a high switching frequency of 260 kHz, which allows for smaller external components and thus, a more compact design. The adjustable output voltage is achieved through an external resistor divider, providing flexibility across different applications. Additional characteristics include excellent line and load regulation, overcurrent protection, a thermal shutdown feature, and high efficiency over a wide load range.
This device is commonly used in distributed power systems, battery chargers, and other consumer electronics where precise voltage regulation and energy efficiency are critical. Its TO-263 package helps in effective heat dissipation, ensuring reliable performance.
Key features include a high switching frequency of 260 kHz, which allows for smaller external components and thus, a more compact design. The adjustable output voltage is achieved through an external resistor divider, providing flexibility across different applications. Additional characteristics include excellent line and load regulation, overcurrent protection, a thermal shutdown feature, and high efficiency over a wide load range.
This device is commonly used in distributed power systems, battery chargers, and other consumer electronics where precise voltage regulation and energy efficiency are critical. Its TO-263 package helps in effective heat dissipation, ensuring reliable performance.
Equivalent
The LM2678SX-ADJ is a step-down voltage regulator. Equivalent products include:
1. LM2576-ADJ by Texas Instruments - similar adjustable regulator.
2. L4970A by STMicroelectronics - adjustable switching regulator.
3. MC34063 by ON Semiconductor - versatile switching regulator IC.
4. MP1584EN by Monolithic Power Systems - compact, adjustable step-down converter.
Always verify the specifications and pin compatibility when selecting an equivalent to ensure it meets your application's requirements.
1. LM2576-ADJ by Texas Instruments - similar adjustable regulator.
2. L4970A by STMicroelectronics - adjustable switching regulator.
3. MC34063 by ON Semiconductor - versatile switching regulator IC.
4. MP1584EN by Monolithic Power Systems - compact, adjustable step-down converter.
Always verify the specifications and pin compatibility when selecting an equivalent to ensure it meets your application's requirements.
Features
The LM2678SX-ADJ is a versatile step-down voltage regulator designed for efficient power conversion. Key features include:
1. Adjustable Output Voltage: Provides flexibility with a wide output voltage range, allowing users to customize according to specific needs.
2. High Output Current Capability: Supports up to 5A output current, suitable for powering various applications.
3. Wide Input Voltage Range: Accepts input voltages from 8V to 40V, making it adaptable to different power sources.
4. High Efficiency: Capable of achieving efficiencies up to 92%, which reduces heat generation and power loss.
5. Switching Frequency: Operates at a fixed frequency of 260 kHz, ensuring stable and predictable performance.
6. Thermal Protection: Includes over-temperature shutdown to protect the device from overheating.
7. Overcurrent Protection: Built-in safeguards against excessive current conditions.
8. Simple Design: Minimal external components are required, simplifying the implementation process.
9. Package: Available in a TO-263 surface-mount package, which aids in efficient thermal management and compact designs.
These features make the LM2678SX-ADJ ideal for applications in communications, consumer electronics, and industrial equipment.
1. Adjustable Output Voltage: Provides flexibility with a wide output voltage range, allowing users to customize according to specific needs.
2. High Output Current Capability: Supports up to 5A output current, suitable for powering various applications.
3. Wide Input Voltage Range: Accepts input voltages from 8V to 40V, making it adaptable to different power sources.
4. High Efficiency: Capable of achieving efficiencies up to 92%, which reduces heat generation and power loss.
5. Switching Frequency: Operates at a fixed frequency of 260 kHz, ensuring stable and predictable performance.
6. Thermal Protection: Includes over-temperature shutdown to protect the device from overheating.
7. Overcurrent Protection: Built-in safeguards against excessive current conditions.
8. Simple Design: Minimal external components are required, simplifying the implementation process.
9. Package: Available in a TO-263 surface-mount package, which aids in efficient thermal management and compact designs.
These features make the LM2678SX-ADJ ideal for applications in communications, consumer electronics, and industrial equipment.
Pinout
The LM2678SX-ADJ is a high-efficiency step-down voltage regulator from Texas Instruments. It comes in a TO-263 package with a total of 7 pins. The functions of these pins are as follows:
1. VIN: Input voltage pin where the supply voltage is connected.
2. GND: Ground pin, which serves as the return path for the input and output currents.
3. SW: Switch pin, the output of an internal power switch used to drive the inductor.
4. BOOT: Bootstrap pin, provides a drive voltage higher than the input voltage to the internal switch.
5. FB: Feedback pin, used to regulate the output voltage by connecting it to the midpoint of an output voltage divider.
6. ON/OFF: Shutdown pin, used to enable or disable the regulator.
7. VOUT: Not specifically labeled as a pin, but the regulated output voltage is derived from the external components connected to the SW and FB pins.
This adjustable regulator is suitable for a variety of applications requiring efficient power conversion.
1. VIN: Input voltage pin where the supply voltage is connected.
2. GND: Ground pin, which serves as the return path for the input and output currents.
3. SW: Switch pin, the output of an internal power switch used to drive the inductor.
4. BOOT: Bootstrap pin, provides a drive voltage higher than the input voltage to the internal switch.
5. FB: Feedback pin, used to regulate the output voltage by connecting it to the midpoint of an output voltage divider.
6. ON/OFF: Shutdown pin, used to enable or disable the regulator.
7. VOUT: Not specifically labeled as a pin, but the regulated output voltage is derived from the external components connected to the SW and FB pins.
This adjustable regulator is suitable for a variety of applications requiring efficient power conversion.
Manufacturer
The manufacturer of the LM2678SX-ADJ is Texas Instruments. Texas Instruments (TI) is an American technology company that designs and manufactures semiconductors and integrated circuits, which it sells to electronics designers and manufacturers globally. The company is well known for its analog chips and embedded processors, which are used in a variety of applications across different industries, including automotive, industrial, personal electronics, communications equipment, and enterprise systems. TI is recognized for its innovation and contributions to the electronics industry, with a focus on developing products that help improve efficiency, performance, and reliability in electronic devices.
Application
The LM2678SX-ADJ is a versatile step-down (buck) voltage regulator, commonly used in applications requiring efficient power conversion. Its adjustable output voltage makes it suitable for various uses, including:
1. Power Supply Design: For generating stable output voltages from higher input voltages, ideal for industrial and consumer electronics.
2. Battery-Powered Devices: Efficiently converting battery voltage to the required levels while maximizing battery life.
3. Embedded Systems: Providing precise power regulation for microcontrollers and other ICs.
4. Telecommunications: Supplying regulated power to communication equipment.
5. Automotive Electronics: Used in managing onboard power supplies in vehicles.
These applications benefit from the LM2678SX-ADJ's high efficiency, wide input voltage range, and reliable performance.
1. Power Supply Design: For generating stable output voltages from higher input voltages, ideal for industrial and consumer electronics.
2. Battery-Powered Devices: Efficiently converting battery voltage to the required levels while maximizing battery life.
3. Embedded Systems: Providing precise power regulation for microcontrollers and other ICs.
4. Telecommunications: Supplying regulated power to communication equipment.
5. Automotive Electronics: Used in managing onboard power supplies in vehicles.
These applications benefit from the LM2678SX-ADJ's high efficiency, wide input voltage range, and reliable performance.
Package
The LM2678SX-ADJ is a voltage regulator with an adjustable output. It typically comes in a TO-263 surface-mount package, also known as the DDPAK/TO-263-7. This package is designed for efficient heat dissipation and is suited for high-power applications.
