BD9B305QUZ-E2

Overview

The BD9B305QUZ-E2 is a single-channel synchronous buck DC/DC converter manufactured by ROHM Semiconductor. It features an input voltage range of 2.7V to 5.5V and delivers a maximum output current of 3.0A. The adjustable output voltage spans from 0.6V to 4.4V. The device supports switching frequencies up to 1MHz and operates within a temperature range of -40°C to +85°C. It utilizes constant on-time control for fast transient response and includes light load mode operation to minimize standby power consumption.

Feature Summary

• Integrates controller and power MOSFETs in a compact VMMP08LZ2020 package with backside heat dissipation.
• Employs constant on-time control architecture to ensure rapid transient response and stable operation under varying loads.
• Includes comprehensive protection mechanisms such as over-voltage, over-current, short-circuit, thermal shutdown, and under-voltage lockout.
• Features adjustable soft start and output capacitor discharge functions to support safe system startup and shutdown sequences.

Applications

• Power supply design for Xilinx Spartan-7 FPGA platforms
• Industrial equipment requiring low standby power consumption
• Consumer electronics utilizing sensor fusion and embedded vision

Procurement Notes

Verify the specific suffix CE2 or E2 against the manufacturer's official datasheet to confirm pinout compatibility and electrical specifications. Ensure the ordering information matches the exact part number variant required for your application, as suffixes may indicate differences in packaging or revision levels. Confirm RoHS compliance status through the latest product documentation before finalizing procurement.

Selection Notes

Select this component when a high-efficiency, low-profile synchronous buck converter is needed for inputs between 2.7V and 5.5V. The integrated MOSFET design reduces external component count compared to discrete solutions. Consider the VMMP08LZ2020 package size constraints and the need for backside thermal management in dense PCB layouts. This device is suitable for applications prioritizing small form factors and efficient light-load performance.

Part Context

This part belongs to the BD9B series of integrated MOSFET DC/DC converters from ROHM. These devices are designed for applications demanding high efficiency and minimal footprint. The series utilizes constant on-time control to achieve fast transient responses while maintaining low noise. The BD9B305QUZ-E2 specifically targets systems requiring 3A output capability within a narrow input voltage window.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material. Consult the manufacturer's official documentation for recommended alternatives or cross-reference guides if replacement is necessary.