BD9422EFV-E2

Overview

The BD9422EFV-E2 is a white LED driver IC designed for large LCD panels, manufactured by ROHM Semiconductor. It features a boost topology with six constant current output channels capable of driving up to 400 mA per channel. The device operates within an input voltage range of 9 V to 35 V and supports a switching frequency of 500 kHz. It integrates a DC-DC controller using an external FET and provides adjustable output voltage. The component is housed in a 40-pin HTSSOP-B package and functions reliably across a temperature range of -40°C to +85°C.

Feature Summary

• Integrates six independent constant current LED drivers with high-speed pulse response capabilities.
• Includes a dedicated boost-type DC-DC controller section utilizing current mode control with an external field-effect transistor.
• Supports both analog linear dimming via the VREF terminal and independent external PWM dimming for each channel.
• Incorporates comprehensive protection mechanisms including overvoltage, overcurrent, UVLO, thermal shutdown, and LED open/short detection.

Applications

• White LED backlighting systems for large LCD panels
• High-efficiency LED lighting driver circuits
• Industrial display backlighting applications

Procurement Notes

Verify the specific suffix E2 against the official datasheet to confirm compliance with RoHS directives and whisker resistance requirements. Ensure the ordering part number matches the exact package variant HTSSOP-B-40. Confirm that the intended application environment falls within the specified operating temperature range of -40°C to +85°C. Validate that the system design accommodates the required minimum order quantity and reel packaging specifications provided by authorized distributors.

Selection Notes

Select this component when designing multi-channel LED backlights requiring independent dimming control and robust fault protection. The integrated boost converter simplifies designs needing high voltage outputs from lower input sources. Consider the 400 mA per channel limit and the need for an external FET for the DC-DC section. This IC is suitable for applications demanding high constant current accuracy and automatic fault recovery features.

Part Context

The BD9422EFV-E2 belongs to ROHM's series of LED lighting driver ICs optimized for display applications. It shares architectural similarities with other models in the family but is distinct in its six-channel configuration and specific protection feature set. The device is classified under PMIC LED drivers and utilizes a surface-mount package suitable for automated assembly processes in consumer electronics manufacturing.

Replacement Considerations

BD9397EFV-GE2 is documented as a parameter-equivalent substitute option available from ROHM Semiconductor.

FAQ

How is dimming controlled on the BD9422EFV-E2?

Dimming can be achieved through two methods: analog linear dimming using the VREF terminal or independent external PWM inputs for each of the six channels.

What protection features are included in the LED driver section?

The LED driver section includes LED OPEN and SHORT detection capabilities. The short detection voltage is configurable via the LSP terminal.

Does the BD9422EFV-E2 support master/slave operation?

Yes, the internal architecture of the BD9422EFV-E2 supports master/slave mode functionality for cascading multiple units.