Analog Devices Inc.

LT3491ESC8

LT3491ESC8 Description

The LT3491ESC8 from Analog Devices Inc. is a high-performance DC-DC regulator designed for LED driving applications, particularly in backlighting systems. This obsolete component belongs to the True Color PWM™ series, offering precise PWM dimming control for consistent brightness adjustment. Housed in an SC70-8 surface-mount package, it integrates an internal switch (350mA current capability) and operates at a 2.3MHz switching frequency, enabling compact designs with minimal external components. With a wide input voltage range (2.5V to 12V) and output voltage up to 27V, it supports diverse LED configurations while maintaining efficiency.

LT3491ESC8 Features

• Integrated Switch: Eliminates the need for an external MOSFET, reducing BOM cost and board space.
• High-Frequency Operation (2.3MHz): Allows for smaller inductors and capacitors, optimizing PCB footprint.
• PWM Dimming: Delivers True Color PWM™ performance for flicker-free brightness control, ideal for display backlighting.
• Wide Voltage Range: Supports 2.5V–12V input and up to 27V output, accommodating multi-LED strings.
• Compact SC70-8 Package: Suitable for space-constrained applications.
• MSL 1 (Unlimited): Moisture-resistant packaging ensures reliability in storage and assembly.

LT3491ESC8 Applications

• LCD/OLED Backlighting: Precision dimming for consumer electronics (e.g., smartphones, tablets).
• Portable Devices: Efficient power management in battery-operated systems due to low minimum supply voltage (2.5V).
• Automotive Displays: High output voltage capability supports LED clusters in dashboards or infotainment systems.
• Industrial Lighting: Robust performance in environments requiring stable PWM control.

Conclusion of LT3491ESC8

The LT3491ESC8 excels in LED driver applications demanding high efficiency, compact size, and PWM dimming accuracy. While obsolete, its integrated design and wide operational range make it a historical benchmark for backlight solutions. Engineers seeking alternatives should consider modern equivalents with similar specs but updated availability. For legacy systems, this IC remains a testament to Analog Devices’ innovation in power management and LED control.