RT8555WSC

Overview

The RT8555WSC is a high-efficiency LED driver IC designed for white LEDs, manufactured by Richtek USA Inc. It functions as a six-output DC-DC step-up (boost) regulator capable of driving LED light bars with six strings from single or two-cell battery inputs. The device supports analog and PWM dimming methods and delivers a constant current of 35mA per channel. It operates within an ambient temperature range of -40°C to +85°C and utilizes a 20-WLCSP package measuring 1.65x2.05 mm.

Feature Summary

• High efficiency design suitable for battery-powered applications
• Six independent output channels for multi-string LED arrays
• Supports both analog and PWM dimming control methods
• Integrated step-up (boost) converter topology

Applications

• LED light bars driven by single cell batteries
• LED light bars driven by two cell batteries
• White LED backlighting systems in portable devices

Procurement Notes

Verify the exact part marking and datasheet revision against the manufacturer's official documentation before procurement. Ensure the WLCSP package dimensions and pinout match the target PCB layout. Confirm that the specific ordering suffix corresponds to the required tape and reel quantity if applicable. Cross-reference the component date code and lot traceability requirements with the supplier's certification.

Selection Notes

Select this component when designing circuits requiring six-channel LED drive capability from low-voltage battery sources. The integrated boost converter eliminates the need for external inductors associated with separate boost stages, simplifying the bill of materials. Consider the 35mA output current limit and the 2MHz switching frequency when evaluating thermal performance and electromagnetic interference constraints for the specific enclosure design.

Part Context

Richtek Technology specializes in power management integrated circuits, including LED drivers and DC-DC converters. The RT8555 series addresses the demand for compact, efficient lighting solutions in mobile and portable electronics. This specific model represents a multi-channel solution optimized for space-constrained designs requiring precise current regulation across multiple LED strings.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Verify compatibility with existing board layouts and control signals if considering alternative manufacturers' multi-channel LED drivers.