LM2679T-3.3/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

Characteristics: - Input Voltage Range: 8V to 40V - Output Voltage: 3.3V - Output Current: Up to 3A - Efficiency: Up to 92% - Package Type: TO-220 - Operating Temperature Range: -40°C to +125°C

Essence: The LM2679T-3.3/NOPB is a step-down voltage regulator IC that provides a regulated output voltage of 3.3V from an input voltage range of 8V to 40V. It is commonly used in various electronic devices and systems to ensure a stable and reliable power supply.

Packaging/Quantity: The LM2679T-3.3/NOPB is available in a TO-220 package, which provides excellent thermal performance. It is typically sold in reels or tubes containing multiple units.

Specifications

• Input Voltage Range: 8V to 40V
• Output Voltage: 3.3V ±2%
• Output Current: Up to 3A
• Switching Frequency: 260kHz
• Dropout Voltage: 1.2V (max)
• Quiescent Current: 10mA (typ)
• Efficiency: Up to 92%
• Operating Temperature Range: -40°C to +125°C
• Package Type: TO-220

Pin Configuration

The LM2679T-3.3/NOPB has the following pin configuration:

___________ | | VIN --|1 5|--- VOUT GND --|2 4|--- FB SW --|3 6|--- COMP |___________|

1. VIN: Input Voltage Pin
2. GND: Ground Pin
3. SW: Switching Pin
4. FB: Feedback Pin
5. VOUT: Output Voltage Pin
6. COMP: Compensation Pin

Functional Features

• Wide input voltage range allows compatibility with various power sources.
• High efficiency ensures minimal power loss and improved energy efficiency.
• Overcurrent protection safeguards the circuit from excessive current flow.
• Thermal shutdown protection prevents damage due to overheating.
• Soft-start feature reduces inrush current during startup.

Advantages

• Compact TO-220 package provides excellent thermal performance.
• Wide input voltage range makes it suitable for a variety of applications.
• High efficiency results in reduced power dissipation and longer battery life.
• Overcurrent and thermal protection enhance system reliability and safety.
• Soft-start feature minimizes stress on components during startup.

Disadvantages

• Limited output current of up to 3A may not be sufficient for high-power applications.
• Fixed output voltage of 3.3V may not be adjustable for certain requirements.
• Requires external components for proper operation, increasing overall system complexity.

Working Principles

The LM2679T-3.3/NOPB operates as a step-down voltage regulator using a pulse-width modulation (PWM) control scheme. It converts the higher input voltage to a regulated 3.3V output voltage by rapidly switching an internal power MOSFET. This switching action, controlled by feedback from the FB pin, maintains the desired output voltage despite variations in the input voltage or load conditions.

Application Field Plans

The LM2679T-3.3/NOPB is widely used in various electronic devices and systems, including but not limited to: - Power supplies for microcontrollers, sensors, and other low-power digital circuits. - Battery-powered devices requiring a stable 3.3V power source. - Automotive electronics, such as infotainment systems and engine control units. - Industrial automation equipment, including motor drives and control systems. - LED lighting applications, where a regulated voltage is crucial for proper operation.

Alternative Models

• LM2679T-5.0/NOPB: Provides a fixed 5V output voltage.
• LM2679T-ADJ/NOPB: Adjustable output voltage version with external resistor divider.
• LM2596S-3.3/NOPB: Similar functionality but in a different package (TO-263).

These alternative models offer similar features and performance characteristics, providing flexibility to suit specific application requirements.

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