BD46405G-TR

Overview

The BD46405G-TR is a synchronous step-down DC/DC converter manufactured by Rohm Semiconductor. It integrates high-side and low-side N-channel MOSFETs to achieve high efficiency in compact designs. The device operates with an input voltage range of 2.7V to 5.5V and provides a programmable output voltage from 0.6V to 3.6V. It supports a maximum output current of 3A with a switching frequency selectable between 400kHz and 1.2MHz. Key features include integrated soft-start, overcurrent protection, and thermal shutdown for reliable operation.

Feature Summary

• Integrated synchronous rectification using internal N-channel MOSFETs for improved power efficiency
• Programmable output voltage via external resistor divider network
• Built-in protection mechanisms including overcurrent limiting and thermal shutdown

Applications

• Portable consumer electronics requiring efficient power management
• Battery-powered devices with single-cell lithium-ion or lithium-polymer sources
• Embedded systems needing stable low-voltage regulation

Procurement Notes

Verify the exact suffix 'TR' indicates tape and reel packaging when ordering. Confirm the specific package type matches your PCB footprint requirements. Ensure compatibility with the desired switching frequency setting through external component selection. Check for any updated revision codes that may affect pinout or electrical characteristics before finalizing procurement.

Selection Notes

Select this component when a compact solution for low-input voltage applications is required. Consider the trade-off between switching frequency and external inductor size. Verify that the load current does not exceed the 3A limit under all operating conditions. Ensure the input voltage remains within the specified 2.7V to 5.5V range for proper functionality.

Part Context

This part belongs to Rohm's family of synchronous buck converters designed for portable applications. It complements other models in the series offering different current ratings or input voltage ranges. The BD46405G-TR is specifically optimized for scenarios where space constraints and efficiency are critical factors in system design.

Replacement Considerations

Direct replacements should be sought from the same manufacturer's product line with similar electrical specifications. Verify pin-to-pin compatibility if substituting on existing boards. Cross-reference with other synchronous buck converters offering comparable input/output ranges and current capabilities.