BD9479FV-GE2

Overview

The BD9479FV-GE2 is an eight-channel white LED driver IC designed for large LCD panel backlighting. It utilizes a boost DCDC converter topology with an input voltage range of 9 V to 35 V and operates at a switching frequency of 800 kHz. The device provides adjustable output voltage and supports a maximum LED setting current of 500 mA via the VREF pin. It features individual channel PWM dimming and analog linear dimming capabilities. Packaged in a 40-pin SSOP-B format, it functions within a temperature range of -40°C to +85°C.

Feature Summary

• Integrates an internal DCDC converter to supply appropriate voltage to LED series arrays.
• Provides independent PWM dimming control for each of the eight channels.
• Includes comprehensive protection mechanisms such as overvoltage, overcurrent, short circuit, and open detection.
• Supports both analog linear dimming and individual channel pulse-width modulation.

Applications

• White LED drivers for large LCD panels
• Backlight systems for commercial displays
• High-brightness LED lighting arrays

Procurement Notes

Verify the specific suffix GE2 to confirm RoHS compliance and lead times. Confirm package availability in cut tape or reel formats based on project volume requirements. Ensure compatibility with external PNP transistor configurations if utilizing the constant current driver architecture. Cross-reference datasheet revisions for any updates to thermal characteristics or pin assignments before finalizing procurement.

Selection Notes

Select this component when designing high-channel-count LED backlights requiring integrated boost conversion. It is suitable for applications needing precise individual channel control via PWM. Consider the 40-pin SSOP-B package constraints for PCB layout. Verify that the external PNP transistor selection aligns with the required drive current and thermal dissipation limits for the specific application environment.

Part Context

This part belongs to ROHM's dedicated LED lighting driver family, specifically engineered for high-efficiency backlighting solutions. It addresses the need for compact, multi-channel control in large display applications by integrating power conversion and regulation into a single semiconductor solution.

Replacement Considerations

Check for updated suffixes or revised versions within the BD9479 series. Evaluate alternative ROHM models with similar channel counts and boost topologies if pin compatibility is not strictly required.

FAQ

Does the BD9479FV-GE2 include internal power switches?

No, the device is a controller type that requires external components for the power stage, typically utilizing external PNP transistors for the constant current driver configuration.

What types of dimming are supported?

The IC supports both analog linear dimming and individual channel PWM dimming for each of the eight outputs.