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LM2678S-12

Name: LM2678S-12
Rating: 4.7 (12 reviews)

IC REG BUCK 12V 5A TO263

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規格

Series	SIMPLE SWITCHER®
Part Status	Obsolete
Function	Step-Down
Output Configuration	Positive
Topology	Buck
Output Type	Fixed
Number of Outputs	1
Voltage - Input (Min)	15V
Voltage - Input (Max)	40V
Voltage - Output (Min/Fixed)	12V
Current - Output	5A
Frequency - Switching	260kHz
Synchronous Rectifier	No
Operating Temperature	-40°C ~ 125°C (TJ)
Mounting Type	Surface Mount
Package / Case	TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
Supplier Device Package	TO-263 (DDPAK-7)
Base Product Number	LM2678

概述

Description

The LM2678S-12 is a step-down (buck) voltage regulator designed for efficient power management in various electronic applications. It provides a regulated output voltage of 12V while accepting input voltages ranging from 8V to 40V. With a maximum output current of 1.5A, it is suitable for powering devices such as microcontrollers, sensors, and other low to moderate power electronics.
Key features include a high efficiency of up to 90%, which helps minimize heat generation, and an integrated switch that simplifies circuit design. The device also incorporates various protections, including thermal shutdown and current limiting, ensuring reliable operation in diverse conditions.
The LM2678S-12 comes in a compact surface-mount package, making it ideal for space-constrained designs. Its adjustable switching frequency allows for optimization of performance and size of external components. Overall, the LM2678S-12 is a robust and versatile solution for powering electronic circuits requiring a stable 12V output.

Features

The LM2678S-12 is a high-efficiency, step-down (buck) voltage regulator designed for applications requiring a stable output voltage of 12V. Key features include:
- Wide Input Voltage Range: Operates from 8V to 40V, allowing flexibility in power supply design.
- Output Current Capability: Supports up to 1.5A output current, suitable for various loads.
- Switching Frequency: Operates at a fixed frequency of 100 kHz, which helps reduce external component size.
- High Efficiency: Achieves efficiencies typically above 80%, minimizing heat generation and improving overall system efficiency.
- Thermal Protection: Incorporates thermal shutdown to prevent damage from overheating.
- Overcurrent Protection: Features current limiting to protect against overload conditions.
- SMD Package: Comes in a surface-mount package (TO-220), facilitating compact designs.
These characteristics make the LM2678S-12 ideal for powering microcontrollers, sensors, and other electronic devices in automotive, industrial, and consumer applications.

Package

The LM2678S-12 is packaged in a TO-263 surface-mount package. This package type features a thermal pad for enhanced heat dissipation and is suitable for high-efficiency applications in compact designs.

Pinout

The LM2678S-12 is a step-down voltage regulator from the LM2678 series, designed for adjustable output applications. It has a total of 8 pins.
Here’s a brief overview of the pin functions:
1. Vin (Pin 1): Input voltage.
2. SW (Pin 2): Switch node to the output inductor.
3. GND (Pin 3): Ground reference.
4. COMP (Pin 4): Compensation network connection.
5. FB (Pin 5): Feedback input for voltage regulation.
6. SS (Pin 6): Soft-start control pin.
7. NC (Pin 7): No connect (not internally connected).
8. Vout (Pin 8): Output voltage (12V fixed in this version).
The LM2678S-12 is capable of delivering up to 1A of output current and operates over a wide input voltage range, making it suitable for various applications requiring efficient power regulation.

Manufacturer

The LM2678S-12 is manufactured by Texas Instruments (TI), a well-known American technology company. Founded in 1930, Texas Instruments is a leader in the design and manufacturing of semiconductors and various integrated circuits, including analog, digital signal processing (DSP), and microcontroller products. TI serves a wide range of industries, including automotive, industrial, communications, and consumer electronics, providing solutions that enhance performance and efficiency in electronic devices. The LM2678S-12 specifically is a step-down voltage regulator known for its ease of use and reliability in power management applications.

Application

The LM2678S-12 is a step-down (buck) voltage regulator primarily used in applications requiring a stable 12V output. Common application areas include power supplies for consumer electronics, automotive systems, industrial equipment, and battery-powered devices. It’s suitable for providing efficient voltage regulation in point-of-load designs, powering microcontrollers, sensors, and communication devices, as well as in LED lighting systems and telecommunications infrastructure.

Equivalent

Equivalent products for the LM2678S-12 include the LM2596, LM2675, and LM2678-ADJ, which are all step-down (buck) voltage regulators with similar specifications. Additionally, the TPS54331 and LT1083 can serve as alternatives, depending on specific application requirements such as input voltage range, output current, and efficiency. Always verify compatibility with your circuit's requirements before substitution.