RT4831AWSC

Overview

The RT4831AWSC is a four-channel white LED driver IC from Richtek, designed for portable device backlighting. It supports up to 4P8S WLED configurations with a maximum output voltage of 29V. The device operates on a supply voltage range of 2.7V to 5V and delivers 100mA per channel. Output voltage ranges from 4V to 7.15V depending on configuration. It features I²C and PWM dimming controls with an operating frequency between 450kHz and 1.1MHz. Packaged in a 24-WL-CSP (BSC) measuring 1.84x2.68mm, it functions within a temperature range of -40°C to +85°C.

Feature Summary

• Integrates LCD bias power generation alongside four-channel WLED driving capabilities
• Supports flexible WLED configurations including up to 4 parallel strings of 8 series LEDs
• Enables precise brightness control through I²C interface and PWM dimming signals

Applications

• Smartphone display backlight systems
• Tablet computer screen illumination
• Portable electronic device LED arrays

Procurement Notes

Verify the specific suffix 'WSC' against the manufacturer's official datasheet to confirm package type and tape/reel specifications. Ensure compatibility with system voltage requirements of 2.7V to 5V. Confirm that the 24-WL-CSP footprint matches the PCB design constraints. Check for RoHS compliance documentation if required by regional regulations. Validate that the I²C address settings align with existing bus architecture.

Selection Notes

Select this component when a single IC must handle both LCD bias generation and multi-string WLED driving. It is suitable for space-constrained designs requiring a 1.84x2.68mm footprint. Choose this part if I²C control is preferred over analog dimming for system integration simplicity. Ensure the application requires a maximum output voltage capability of 29V or less.

Part Context

This device belongs to Richtek's portfolio of integrated power management solutions for mobile electronics. It combines linear regulation with switching functionality to drive high-brightness LEDs efficiently. The WL-CSP packaging allows for minimal board space usage compared to traditional QFN packages. It targets the growing demand for compact, high-performance display drivers in consumer handheld devices.

Replacement Considerations

Consult official substitution lists for equivalent 4-channel WLED drivers with similar electrical characteristics. Verify pin-to-pin compatibility if replacing in existing designs. Ensure alternative parts support the same 24-WL-CSP package dimensions. Confirm that substitute components offer comparable I²C interface protocols and dimming resolution.