LM3402MRX/NOPB

Product Overview

• Category: Integrated Circuit (IC)
• Use: LED Driver
• Characteristics: High Efficiency, Constant Current Output
• Package: 8-Pin SOIC
• Essence: Monolithic Buck Regulator
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 6V to 42V
• Output Current: Up to 1.5A
• Switching Frequency: Adjustable up to 1MHz
• Efficiency: Up to 95%
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The LM3402MRX/NOPB has the following pin configuration:

1. VIN: Input voltage
2. GND: Ground
3. FB: Feedback pin for setting the output current
4. EN: Enable pin for turning the device on/off
5. VCC: Supply voltage for internal circuitry
6. SW: Switch node for connecting the inductor
7. COMP: Compensation pin for stability control
8. VOUT: Output voltage

Functional Features

• Wide input voltage range allows for versatile applications
• Constant current output ensures consistent LED brightness
• Adjustable switching frequency enables optimization for different designs
• Internal compensation simplifies external component requirements
• Thermal shutdown and overcurrent protection enhance reliability

Advantages and Disadvantages

Advantages

• High efficiency leads to energy savings
• Compact package size saves board space
• Wide operating temperature range allows for use in various environments
• Integrated features reduce external component count and cost

Disadvantages

• Limited maximum output current may not be suitable for high-power LED applications
• Non-isolated design may require additional circuitry for safety isolation

Working Principles

The LM3402MRX/NOPB is a monolithic buck regulator designed to drive LEDs. It operates by converting the input voltage to a lower, regulated output current. The device uses a pulse-width modulation (PWM) control scheme to maintain a constant current through the connected LEDs. This ensures consistent brightness and extends LED lifespan.

Detailed Application Field Plans

The LM3402MRX/NOPB is commonly used in various lighting applications, including:

1. Automotive lighting
2. Street lighting
3. Architectural lighting
4. Signage and display lighting
5. Backlighting for LCD panels
6. General illumination

Detailed and Complete Alternative Models

• LM3402HV: High-voltage version suitable for applications up to 75V input voltage
• LM3402MPX: Higher maximum output current of 2A for more demanding LED applications
• LM3402LQ: Low-power version with reduced output current capability for low-intensity LEDs

These alternative models offer different specifications and features to cater to specific application requirements.

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