BD9B304QWZ-E2

Overview

The BD9B304QWZ-E2 is a single-channel synchronous buck DC/DC converter manufactured by ROHM Semiconductor. It features an integrated power MOSFET and controller within a UMMP008AZ020 package measuring 2.0x2.0 mm with a thickness of 0.4 mm. The device supports an input voltage range from 2.7 V to 5.5 V, delivering a maximum output current of 3.0 A. The adjustable output voltage spans from 0.8 V to 4.4 V. Operating frequencies can be set up to a maximum of 2 MHz. The component operates within a temperature range of -40°C to +85°C and includes light load mode functionality for efficiency optimization.

Feature Summary

• Integrates a synchronous buck topology with built-in power MOSFETs and control circuitry in a compact footprint.
• Employs constant on-time control architecture to ensure rapid transient response and stability under varying load conditions.
• Incorporates deep light-load mode (Deep-SLLM) capabilities to minimize power consumption during low-demand operation.
• Provides comprehensive protection mechanisms including over-current, short-circuit, thermal shutdown, and under-voltage lockout.

Applications

• Portable electronic devices requiring efficient step-down conversion from battery sources
• Embedded systems utilizing 3.3V or 5V input rails
• Consumer electronics with strict space constraints due to small package size
• Industrial equipment operating within standard commercial temperature ranges

Procurement Notes

Verify the specific suffix designation when ordering, as it may indicate tape-and-reel packaging configurations. Confirm RoHS compliance status through official documentation prior to integration. Check current lifecycle status, as availability may vary by region. Ensure compatibility with existing PCB footprints matching the UMMP008AZ020 package dimensions. Validate thermal management requirements given the backside heat dissipation design of the package.

Selection Notes

Select this component for applications demanding high current density in minimal board space. The integrated MOSFET design reduces external component count compared to discrete solutions. Consider the 2 MHz switching frequency capability for minimizing passive component sizes. Evaluate the 2.7 V minimum input voltage against system supply variations. Assess thermal performance needs based on the 2.0x2.0 mm package's heat dissipation characteristics.

Part Context

This part belongs to ROHM's BD9B series of integrated MOSFET DC-DC converters. These devices are designed for portable applications requiring high efficiency and small form factors. The series utilizes constant on-time control for fast transient response. The BD9B304QWZ-E2 specifically targets 3A output applications within a 2.7V to 5.5V input range.

Replacement Considerations

Consult official ROHM documentation for qualified substitute part numbers. Verify pin-to-pin compatibility and electrical parameter alignment before substitution. Cross-reference package dimensions to ensure mechanical fit. Review updated datasheets for any functional differences between original and replacement components.