BD46421G-TR

Overview

The BD46421G-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 efficient power conversion with an input voltage range of 2.7V to 5.5V. The device supports adjustable output voltages from 0.6V to 3.6V, delivering a maximum output current of 2A. Operating at a fixed switching frequency of 1.2MHz, it ensures compact external component sizing. Key electrical specifications include a quiescent current of 18µA in normal operation and 0.9µA in standby mode. The IC features comprehensive protection mechanisms including overcurrent protection, thermal shutdown, and soft-start functionality.

Feature Summary

• Integrated synchronous rectification using internal N-channel MOSFETs for high efficiency
• Fixed 1.2MHz switching frequency enabling the use of small inductors and capacitors
• Adjustable output voltage via external resistor divider network
• Built-in protection against overcurrent, overtemperature, and short circuits

Applications

• Portable battery-powered devices requiring efficient voltage regulation
• Embedded systems with microcontrollers operating at 3.3V or 1.8V
• Consumer electronics such as smartphones and tablets
• Industrial control modules with low-voltage logic interfaces

Procurement Notes

Verify the exact suffix 'TR' indicates tape and reel packaging when ordering. Confirm the package type matches your PCB footprint requirements. Ensure the input voltage source stays within the 2.7V to 5.5V operational range. Check for counterfeit components by sourcing from authorized distributors only. Validate that the thermal performance meets your system's heat dissipation capabilities under full load conditions.

Selection Notes

Choose this component when space constraints require a compact solution due to the high switching frequency. Select it if system efficiency is critical, leveraging the integrated synchronous rectifiers. Consider it for applications needing precise output voltage adjustment within the specified range. Evaluate its suitability for battery-operated devices where low quiescent current extends runtime. Compare its thermal characteristics against alternative regulators if high ambient temperatures are expected.

Part Context

This part belongs to Rohm's family of synchronous buck converters designed for portable electronics. It complements other models in the series offering different current ratings or input voltage ranges. The BD46421G-TR specifically targets applications requiring moderate current output with high efficiency. It shares design principles with similar Rohm regulators but offers distinct pin configurations and electrical limits tailored for specific power management needs.

Replacement Considerations

Direct substitutes may include other Rohm synchronous buck converters with compatible pinouts and electrical specifications. Verify that any replacement maintains the same input voltage range and output current capability. Ensure the alternative device supports the required switching frequency to avoid redesigning passive components. Check for equivalent protection features and thermal performance metrics before finalizing the swap.