BD9411F-E2

Overview

The BD9411F-E2 is a single-channel boost DC/DC controller IC designed for white LED drivers in large LCD backlights. Manufactured by Rohm Semiconductor, it operates within an input voltage range of 9V to 35V and supports a switching frequency of 150kHz. The device features analog and PWM dimming capabilities with adjustable soft start and oscillation frequency. It includes comprehensive protection mechanisms such as over-boost, LED open/short circuit, over-voltage, and over-duty protection. Packaged in an 18-SOP surface-mount case, it functions across a temperature range of -40°C to 105°C.

Feature Summary

• Integrates current mode LED protection circuits including over-boost and over-current protection
• Supports wide-range analog dimming from 0.2V to 3.0V alongside PWM dimming
• Features adjustable soft start and adjustable DC/DC oscillation frequency
• Includes UVLO detection for the power stage input voltage

Applications

• White LED backlighting for large LCD panels
• Industrial display systems requiring high reliability
• Automotive infotainment screen illumination

Procurement Notes

Verify component status carefully before integration, as this part is designated as not recommended for new designs due to potential minimum order quantity restrictions. Confirm that existing inventory or last-time-buy options align with long-term production requirements. Ensure compatibility with current supply chain constraints and validate that alternative sourcing strategies are established if discontinuation impacts manufacturing continuity.

Selection Notes

Select this controller for applications requiring a single-channel boost topology with integrated protection features. It suits designs needing flexible dimming control via analog or PWM signals. Consider the 18-SOP package size and thermal characteristics for PCB layout. Verify input voltage ranges match the power source and ensure the 150kHz frequency fits EMI constraints. Evaluate protection thresholds against specific LED string configurations.

Part Context

This component belongs to Rohm's BD9411 series of LED driver controllers. It shares functional similarities with other single-channel boost drivers but is distinct in its 18-SOP packaging and specific protection feature set. The series targets high-reliability backlighting applications where compact design and robust fault protection are critical for maintaining display performance under varying load conditions.

Replacement Considerations

Public documentation does not list confirmed substitute part numbers. As the component is not recommended for new designs, engineers must evaluate end-of-life implications thoroughly. No direct cross-reference data is available in official sources; alternative selection requires independent technical validation.