RT8485GS

Overview

The RT8485GS is a DC-DC controller designed for LED driver applications, manufactured by Richtek USA Inc. It supports buck and boost topologies with an output voltage capability of up to 150V. The device operates within a supply voltage range of 4.5V to 36V and features a switching frequency adjustable from 100kHz to 1MHz. It offers both analog and PWM dimming capabilities for precise light control. Packaged in a 14-SOP (0.154 inch / 3.90mm wide) surface-mount enclosure, it lacks internal switches. The component is rated for a junction temperature range of -40°C to 125°C and complies with RoHS3 standards.

Feature Summary

• Supports buck and boost converter topologies for flexible LED drive configurations
• Enables high-voltage output generation up to 150V for series LED strings
• Provides dual dimming methods including analog current control and PWM signal input
• Features adjustable switching frequency to optimize external component selection

Applications

• LED backlighting systems
• General LED illumination circuits

Procurement Notes

Verify the specific ordering suffix and package variant carefully, as the RT8485 family includes multiple pin-compatible or functionally similar derivatives. Confirm that the selected part matches the required SOP-14 footprint and electrical specifications for the target design. Check official manufacturer announcements for any product change notices or end-of-life status updates before finalizing procurement plans.

Selection Notes

Select this component when designing isolated or non-isolated LED drivers requiring high output voltages beyond standard IC limits. Ensure the external power MOSFETs and inductors are rated for the maximum 150V output and appropriate current levels. Verify that the chosen switching frequency falls within the 100kHz to 1MHz range to meet efficiency and size constraints. Confirm compatibility with the desired dimming interface, whether analog voltage or digital PWM.

Part Context

The RT8485GS belongs to the RT8485 series of LED driver controllers from Richtek. This series focuses on providing versatile control solutions for various LED lighting architectures. Unlike integrated drivers, this controller requires external power switches, allowing designers to tailor the power stage to specific voltage and current requirements. It serves as a core control element in professional lighting and display backlighting applications.

Replacement Considerations

The RT8462GS is a direct functional substitute within the same manufacturer lineup, offering identical buck-boost topology, 14-SOP packaging, and similar dimming features. Both parts share the same basic product number lineage and application scope. Verify pinout compatibility and parameter alignment before substitution.