BD46401G-TR

Overview

The BD46401G-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, supporting output voltages adjustable from 0.6V to 3.3V via an external resistor divider. It features a fixed switching frequency of 1.2MHz, enabling the use of small inductors and capacitors. The converter includes comprehensive protection mechanisms such as overcurrent protection, thermal shutdown, and soft-start functionality to ensure reliable operation under various load conditions.

Feature Summary

• Integrated synchronous rectification with internal high-side and low-side N-channel MOSFETs for enhanced power conversion efficiency.
• Fixed 1.2MHz switching frequency allows for the use of miniature passive components, reducing overall solution size.
• Built-in safety features including overcurrent protection, thermal shutdown, and controlled soft-start to prevent startup surges.

Applications

• Portable consumer electronics requiring efficient power management
• Battery-powered devices with strict space constraints
• Embedded systems needing stable low-voltage regulation

Procurement Notes

Verify the specific suffix 'G-TR' indicates the tape and reel packaging format when ordering. Confirm that the operating temperature range and pinout configuration match your PCB layout requirements. Ensure compatibility with the desired output voltage setting using the specified feedback resistor network. Check for any recent revisions or obsolescence notices directly from Rohm Semiconductor before finalizing procurement plans.

Selection Notes

Select this component when a compact, high-efficiency solution is required for low-input voltage applications. It is suitable for designs where board space is limited due to its integrated MOSFETs and high switching frequency. Consider the maximum load current capability and thermal performance relative to your enclosure constraints. Verify that the required output voltage falls within the adjustable range supported by the external feedback resistors.

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 BD46401G-TR specifically targets applications needing moderate current output with high efficiency in a minimal footprint. It serves as a key power management IC for modern mobile and wearable technology platforms.

Replacement Considerations

Consult Rohm Semiconductor's official cross-reference documentation for verified substitute part numbers. Ensure any replacement maintains compatible input/output voltage ranges and package dimensions. Verify that alternative components offer similar switching frequencies to preserve existing passive component selections. Confirm that protection features and control interfaces are functionally equivalent to avoid redesigning the surrounding circuitry.