RT4531WSC

Overview

The RT4531WSC is a dual-channel white LED driver IC designed for LCD display backlighting applications. It features an asynchronous boost converter topology with a built-in 1.5A/36V power MOSFET and two high current-matching capability current sinks. The device supports input voltages from 2.5V to 5.5V, operating at a switching frequency of 1MHz. It can drive up to ten series LEDs in a 10s2p configuration with a maximum output current of 20mA per channel. The output voltage reaches up to 36.5V. Encased in a 9-WLCSP package, it operates within a temperature range of -40°C to +85°C.

Feature Summary

• Dual-channel current source with integrated high-efficiency asynchronous boost converter
• Supports both PWM dimming and 1-wire digital dimming interfaces
• Built-in protection mechanisms including overvoltage, short circuit, and open LED detection
• High current matching accuracy between channels for uniform backlight illumination

Applications

• Smartphone LCD backlighting
• Tablet display backlighting
• Portable electronic device illumination

Procurement Notes

Verify the specific ordering suffix and package variant against the manufacturer's official datasheet before procurement. Confirm that the component meets RoHS3 compliance requirements for your assembly process. Ensure the supply chain documentation aligns with the Richtek USA Inc. manufacturing standards. Cross-reference the part number alias RT4531P-A if applicable to your inventory system. Validate the moisture sensitivity level and storage conditions upon receipt.

Selection Notes

Select this component when designing backlight circuits requiring dual independent channels for WLED strings. The low voltage headroom control makes it suitable for battery-powered devices where efficiency is critical. Consider the 10-bit brightness resolution and wide dimming frequency range for display quality requirements. The compact WLCSP package aids in space-constrained PCB layouts for mobile form factors.

Part Context

The RT4531 belongs to Richtek's family of highly efficient dual-channel white LED drivers. It is specifically engineered for portable consumer electronics, offering a balance of performance and integration. The device simplifies design by integrating the power switch and control logic, reducing external component count compared to discrete solutions.

Replacement Considerations

RT4531AWSC is listed as a parameter-equivalent substitute.