BD9S402MUF-CE2

Overview

The BD9S402MUF-CE2 is a single-channel synchronous buck DC/DC converter from ROHM Semiconductor, designed for automotive applications. It features an input voltage range of 2.7 V to 5.5 V and delivers a maximum output current of 4 A. The adjustable output voltage spans from 600 mV to 4.125 V. Operating at a switching frequency up to 2.2 MHz, it utilizes Nano Pulse Control™ technology. The device is housed in a VQFN16FV3030-EP-16 package with wettable flanks, rated for operation between -40°C and +125°C, and holds AEC-Q100 Grade 1 qualification.

Feature Summary

• Integrates Nano Pulse Control™ and QuiCur™ technologies for high efficiency and stable operation under varying load conditions.
• Features built-in low on-resistance power MOSFETs within a synchronous rectification topology to minimize external component count.
• Includes phase compensation circuits and adjustable soft start functionality to ensure rapid transient response and system stability.
• Supports functional safety analysis for automotive use while maintaining compliance with AEC-Q100 reliability standards.

Applications

• Automotive ADAS sensor power supplies
• Vehicle infotainment system regulation
• Instrument cluster power distribution
• Body control module (BCM) voltage conversion

Procurement Notes

Verify the complete part number including the suffix CE2 to confirm the specific tape-and-reel packaging configuration. Ensure compatibility with RoHS directives and confirm that the VQFN16FV3030-EP-16 footprint matches the target PCB layout. Cross-reference the datasheet revision date to validate thermal performance data against current manufacturing standards.

Selection Notes

Select this component when designing compact automotive power stages requiring high current density. The 2.2 MHz frequency allows for smaller inductors compared to lower-frequency alternatives. Verify that the required output voltage falls within the 600 mV to 4.125 V range. Confirm that the 4 A continuous current rating meets the peak load demands of the downstream circuitry without exceeding thermal limits.

Part Context

This device belongs to the BD9S40 series of nano pulse control converters. It shares architectural similarities with the BD9S200MUF but offers higher current capacity. Unlike the BD96240MUF-C which supports multi-phase configurations, this model provides a single channel optimized for space-constrained, high-efficiency applications in modern vehicle electronics.

Replacement Considerations

Direct substitutes include other members of the BD9S40 series or the BD9S200MUF if lower current requirements are acceptable. Verify pinout compatibility and thermal characteristics before swapping. No alternative part numbers are explicitly confirmed as direct replacements in the provided documentation.