BD18351EFV-M

Overview

The BD18351EFV-M is a single-channel boost LED driver with an integrated PWM signal generation circuit. It operates within a 4.5V to 65V input voltage range and supports a maximum output voltage of 65V. The switching frequency reaches up to 0.7MHz, with an operating temperature range from -40°C to 125°C. Housed in an HTSSOP-B24 package measuring 7.8x7.6mm, it features high-side current detection for precise regulation.

Feature Summary

• Built-in PWM signal generation circuit with CRTIMER eliminates the need for external microcontrollers for dimming control.
• High-side LED current detection method enables stable boost/buck operation relative to output voltage.
• Integrated spread spectrum function reduces electromagnetic interference peaks.
• Includes built-in LED open detection and anode-to-ground short protection functions.

Applications

• Headlight LED driving
• Daytime Running Light (DRL) applications
• Tail light LED driving
• Turn signal LED driving

Procurement Notes

Verify the specific ordering suffix matches the required package variant, as the base model may correspond to different tape-and-reel quantities or pin configurations. Confirm AEC-Q100 qualification status and functional safety support category requirements against the target automotive application specifications before finalizing procurement orders.

Selection Notes

Select this component when designing automotive lighting systems requiring independent PWM dimming without MCU intervention. The integrated timer simplifies DRL implementation. Ensure the boost topology aligns with the LED string voltage requirements, considering the 65V maximum output capability and high-side sensing precision for accurate current control across varying load conditions.

Part Context

This device belongs to ROHM's automotive-grade LED driver series designed for headlamp and tail lamp modules. It integrates power switching and control logic to minimize external component count. The HTSSOP-B24 package provides thermal performance suitable for compact automotive lighting assemblies while maintaining robust electrical isolation and reliability standards.

Replacement Considerations

The BD18353EFV-ME2 serves as a related alternative within the same family, offering similar boost topology but with different pin counts and feature sets. Verify pin compatibility and control interface differences before substitution to ensure proper integration into existing lighting driver circuits.