BD81A74EFV-ME2

Overview

The BD81A74EFV-ME2 is a white LED driver IC for automotive applications, featuring four constant current outputs. It integrates a Buck-Boost DC/DC controller with an internal switching FET, supporting input voltages from 4.5 V to 35 V and output voltages up to 40 V. Each channel delivers a maximum drive current of 120 mA, totaling 480 mA across all channels. The device operates at switching frequencies between 200 kHz and 2.2 MHz and supports PWM dimming with a ratio of 10,000:1 at 100 Hz. Qualified under AEC-Q100 Grade 1, it functions within a temperature range of -40°C to +125°C and is housed in a 28-pin HTSSOP-B package.

Feature Summary

• Integrates a Buck-Boost current mode DC/DC controller with an internal switching FET for stable operation despite power supply variations.
• Provides four independent constant current channels with integrated drivers, suitable for high-brightness LED arrays.
• Supports wide-range PWM dimming control via external signals, enabling precise brightness adjustment.
• Includes comprehensive protection features such as UVLO, OVP, TSD, OCP, SCP, and LED open/short detection.

Applications

• Automotive LCD backlighting systems
• High-brightness automotive LED lighting modules
• Vehicle interior illumination circuits

Procurement Notes

Verify the exact ordering suffix and package variant against the manufacturer's latest datasheet, as suffixes may indicate specific tape-and-reel configurations or regional compliance standards. Confirm AEC-Q100 qualification status and functional safety classification (FS supportive) requirements for your specific automotive application before finalizing procurement. Ensure compatibility with your PCB footprint for the 28-HTSSOP-B package.

Selection Notes

Select this component when designing automotive LED systems requiring robust voltage regulation across varying input conditions. The integrated Buck-Boost topology eliminates the need for external boost inductors in buck-mode scenarios, simplifying the design. Consider the 120 mA per channel limit and total current capacity when sizing the LED array. Verify that the required PWM dimming frequency falls within the supported operational range and that the thermal performance of the HTSSOP-B package meets the system's heat dissipation needs.

Part Context

This part belongs to ROHM's automotive-grade LED driver series, specifically designed for white LED applications in vehicles. It is part of the BD81A74 family, which offers variations in package types and pin configurations. The ME2 suffix typically denotes a specific taping and reel configuration compliant with industry standards. It is distinct from similar models like the BD81A74MUV-ME2, which uses a VQFN package, offering different thermal and spatial characteristics for PCB layout.

Replacement Considerations

Direct substitutes include the BD81A74MUV-ME2, which shares identical electrical specifications but utilizes a 28-VFQFN package instead of HTSSOP-B. Designers must account for differences in thermal resistance and PCB mounting requirements when swapping between these package variants. Other members of the BD81A7x series may offer similar functionality but require verification of pinout compatibility and specific feature sets.