Analog Devices Inc.

LTC3220EPF

LTC3220EPF Description

The LTC3220EPF from Analog Devices Inc. is a high-performance DC-DC regulator designed for LED driving applications, particularly in backlighting systems. This switched capacitor (charge pump) topology device operates within a 2.9V to 5.5V supply range, delivering up to 20mA per channel across 18 outputs with an efficiency-optimized 850kHz switching frequency. Packaged in a 28-pin UTQFN and rated for MSL 1 (Unlimited), it is suited for surface-mount assembly in compact designs. Though marked obsolete, its legacy performance remains relevant for specific applications.

LTC3220EPF Features

• Multi-Channel Output: 18 independent outputs, each capable of 20mA, enabling uniform illumination in LED arrays.
• Charge Pump Topology: Eliminates inductors, reducing board space and EMI compared to buck/boost converters.
• Wide Input Range: Operates from 2.9V to 5.5V, compatible with Li-ion batteries and 3.3V/5V rails.
• High Efficiency: 850kHz frequency minimizes ripple and optimizes power delivery.
• Compact Form Factor: UTQFN package ideal for space-constrained designs.
• Simplified Design: No external switches required, reducing BOM complexity.

LTC3220EPF Applications

• Backlighting: Primary use in LCD/LED backlights for portable devices, ensuring consistent brightness.
• Industrial Displays: Drives indicator LEDs in HMI panels or instrumentation.
• Battery-Powered Systems: Efficiently powers LEDs in handheld electronics (e.g., medical devices, scanners).
• Automotive Clusters: Supports auxiliary lighting where space and efficiency are critical.

Conclusion of LTC3220EPF

The LTC3220EPF excels in multi-channel LED driving with its compact, inductorless design and precise current regulation. While obsolete, its high channel count, efficiency, and wide voltage range make it a historical benchmark for backlighting solutions. Engineers seeking alternatives should consider newer charge pump ICs from Analog Devices with enhanced features like dimming control or higher integration.