SC643ULTRT

Overview

The SC643ULTRT is a switched capacitor (charge pump) DC-DC regulator manufactured by Semtech Corporation. It functions as an LED driver IC with five independent outputs, each capable of delivering up to 25 mA. The device operates within an input voltage range of 2.95 V to 5.5 V and provides precise current regulation for multi-channel LED applications. It is housed in a 20-MLPQ-UT package measuring 3x3 mm. The component supports dimming control and is designed for efficient power management in compact electronic systems.

Feature Summary

• Integrates five independent regulated output channels for precise multi-channel LED current control
• Utilizes switched capacitor charge pump topology for efficient DC-DC conversion without inductors
• Supports external dimming control for adjustable brightness levels across all channels

Applications

• Multi-zone LED backlighting systems
• Portable electronic devices requiring compact power management
• Industrial indicator lighting arrays

Procurement Notes

Verify the complete part number including the suffix TRT for reel packaging configuration. Confirm the MLPQ-UT package variant matches your PCB footprint requirements. Ensure compatibility with the specified 2.95 V to 5.5 V input voltage range for your system design. Cross-reference with official Semtech documentation for latest quality alerts or lifecycle status updates before finalizing procurement.

Selection Notes

Select this component when designing circuits requiring multiple independently regulated LED currents from a single charge pump source. It is suitable for space-constrained applications where inductor-based solutions are impractical. Consider the 25 mA per channel limit when determining total load capacity. Evaluate thermal performance within the 3x3 mm package for high-density layouts.

Part Context

The SC643ULTRT belongs to Semtech's portfolio of PMIC-LED drivers. It complements other charge pump regulators by offering multi-output capability in a small form factor. This series targets applications needing precise current matching across multiple LEDs, such as display backlights or status indicators, providing a compact alternative to discrete resistor-based current limiting.

Replacement Considerations

Check Semtech's official cross-reference lists for direct replacements. Verify pin-to-pin compatibility and electrical specifications if substituting with similar charge pump LED drivers from other manufacturers.