LT3476IUHF#PBF

Product Overview

Category: Integrated Circuit (IC)

Use: The LT3476IUHF#PBF is a high-frequency, current mode boost converter designed for driving LEDs. It provides a compact and efficient solution for various LED lighting applications.

Characteristics: - High-frequency operation - Current mode control - Wide input voltage range - Adjustable output voltage - Dimming capability - Overvoltage protection - Thermal shutdown

Package: The LT3476IUHF#PBF is available in a 16-pin QFN package, which offers excellent thermal performance and compact size.

Essence: This IC is specifically designed to drive LEDs efficiently by providing a regulated current source. It ensures optimal power transfer and protects the LEDs from overvoltage and thermal damage.

Packaging/Quantity: The LT3476IUHF#PBF is typically sold in reels of 2500 units per reel.

Specifications

• Input Voltage Range: 2.8V to 36V
• Output Voltage Range: Up to 60V
• Switching Frequency: Up to 1MHz
• Maximum Output Current: 2A
• Dimming Control: Analog/PWM
• Operating Temperature Range: -40°C to 125°C

Pin Configuration

The LT3476IUHF#PBF features the following pin configuration:

1. VIN: Input voltage pin
2. GND: Ground reference pin
3. FB: Feedback pin for regulating output voltage
4. EN/UVLO: Enable/Undervoltage lockout pin
5. DIM: Dimming control pin
6. VCC: Supply voltage for internal circuitry
7. SW: Switch node connection
8. SW: Switch node connection
9. SW: Switch node connection
10. SW: Switch node connection
11. SW: Switch node connection
12. SW: Switch node connection
13. SW: Switch node connection
14. SW: Switch node connection
15. SW: Switch node connection
16. VOUT: Output voltage pin

Functional Features

• High-efficiency LED driver
• Wide input voltage range for versatile applications
• Adjustable output voltage to accommodate different LED configurations
• Dimming control for brightness adjustment
• Overvoltage protection to safeguard LEDs
• Thermal shutdown to prevent overheating

Advantages and Disadvantages

Advantages: - High efficiency leads to energy savings - Compact size and excellent thermal performance - Wide input voltage range allows for flexibility in design - Dimming capability enables brightness control - Overvoltage protection ensures LED longevity - Thermal shutdown prevents damage due to excessive heat

Disadvantages: - Limited maximum output current (2A) - Requires external components for operation

Working Principles

The LT3476IUHF#PBF operates as a current mode boost converter. It regulates the output current by adjusting the duty cycle of the internal switch. The feedback pin (FB) monitors the output voltage and adjusts the switch duty cycle accordingly to maintain a constant current through the LEDs.

When the input voltage is applied, the internal switch starts switching at a high frequency determined by the external components. This generates a regulated current that flows through the LEDs, providing the desired illumination.

Detailed Application Field Plans

The LT3476IUHF#PBF is widely used in various LED lighting applications, including: - Automotive lighting - Architectural lighting - Signage and display lighting - Industrial lighting - Backlighting for LCD panels - Portable lighting devices

Its compact size, high efficiency, and dimming capability make it suitable for both indoor and outdoor lighting applications.

Detailed and Complete Alternative Models

1. LT3476IUHF#TRPBF: Similar to LT3476IUHF#PBF, but available in a 16-pin SO package.
2. LT3476IUHF#PBF-1: Improved version with higher maximum output current (3A).
3. LT3476IUHF#PBF-2: Enhanced model with extended operating temperature range (-40°C to 150°C).

These alternative models offer similar functionality and can be used as substitutes based on specific requirements.

In conclusion, the LT3476IUHF#PBF is a versatile and efficient LED driver IC that provides a compact solution for various lighting applications. Its high-frequency operation, current mode control, and wide input voltage range make it suitable for a wide range of designs. With its dimming capability, overvoltage protection, and thermal shutdown features, it ensures reliable and long-lasting LED illumination.