BD9B400MUV-E2

Overview

The BD9B400MUV-E2 is a single synchronous buck DC/DC converter manufactured by ROHM Semiconductor. It integrates power MOSFETs and operates within an input voltage range of 2.7 V to 5.5 V, delivering a maximum output current of 4.5 A. The adjustable output voltage spans from 800 mV to 4.4 V. The device utilizes constant on-time control with a switching frequency between 1 MHz and 2 MHz. Key electrical specifications include a quiescent current of 10 uA and an operating supply current of 45 uA. It functions reliably across a temperature range of -40°C to +85°C and is housed in a VQFNV3030-EP-16 package.

Feature Summary

• Integrates low on-resistance power MOSFETs for high-efficiency synchronous rectification
• Employs proprietary constant on-time control to minimize standby power consumption during light loads
• Provides comprehensive protection mechanisms including over-current, short-circuit, thermal shutdown, and under-voltage lockout

Applications

• Portable electronic devices requiring efficient step-down conversion
• Battery-powered equipment optimized for deep sleep mode operation
• Embedded systems utilizing 2.7V to 5.5V input rails

Procurement Notes

Verify the specific suffix E2 confirms RoHS compliance and lead-free status as per manufacturer documentation. Confirm the VQFNV3030-EP-16 package dimensions match your PCB footprint requirements. Ensure the design supports the specified 1 MHz to 2 MHz switching frequency for appropriate passive component selection. Validate that the thermal management strategy accommodates the device's operational limits within the -40°C to +85°C range.

Selection Notes

Select this component when a compact solution is needed for converting 2.7V to 5.5V inputs to lower voltages up to 4.4 V. It is suitable for applications demanding high efficiency at light loads due to its specialized control method. Consider the 4.5 A output capability against your peak load requirements. The integrated MOSFETs simplify the bill of materials compared to discrete solutions. Ensure the application does not require automotive qualification, as this is a standard-grade product.

Part Context

This part belongs to the BD9B series of synchronous buck converters from ROHM Semiconductor. It shares architectural similarities with variants like the BD9B500MUV-E2 but differs in current handling capabilities. The series is designed for general-purpose power management in consumer electronics. The EP suffix typically denotes enhanced performance or specific packaging variations within the manufacturer's lineup.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult official ROHM resources for direct replacements or evaluate similar parts within the BD9B family based on specific current and voltage requirements.