Analog Devices Inc.

LT3478EFE

LT3478EFE Description

The LT3478EFE from Analog Devices Inc. is a high-performance DC-DC regulator designed for driving LEDs in demanding applications. Part of the True Color PWM™ series, this obsolete component remains notable for its wide input voltage range (2.8V to 36V) and high output voltage capability (up to 42V), making it suitable for driving multiple LEDs in series. The device integrates a 4.5A internal switch, operates at a programmable frequency (200kHz to 2.25MHz), and supports PWM dimming for precise brightness control. Packaged in a 16-pin TSSOP tube, it is optimized for surface-mount designs in space-constrained environments.

LT3478EFE Features

• High Efficiency: Integrated switch minimizes external components, improving power conversion efficiency.
• Flexible Dimming: PWM dimming ensures accurate LED brightness adjustment without color shift.
• Wide Voltage Range: Operates from 2.8V to 36V, accommodating diverse power sources.
• High Output Current: Supports 4.5A (switch current), enabling robust LED driving.
• Adjustable Frequency: 200kHz to 2.25MHz operation reduces EMI and optimizes for specific design needs.
• Compact Design: 16-pin TSSOP package suits space-sensitive applications.

LT3478EFE Applications

• Backlighting: Ideal for LCD/LED backlight modules in displays and automotive dashboards.
• Industrial Lighting: Suitable for high-voltage LED arrays in factory and signage lighting.
• Portable Devices: Efficient power management for battery-powered LED systems.
• Architectural Lighting: Precision dimming for dynamic lighting control systems.

Conclusion of LT3478EFE

Though marked obsolete, the LT3478EFE remains a technically advanced solution for high-voltage LED driving, offering PWM dimming, wide input range, and high efficiency. Its integration of critical functions reduces BOM complexity, making it a preferred choice for backlighting and industrial lighting designs. Engineers seeking legacy or proven LED driver ICs may still find value in its performance and flexibility.