BD46385G-TR

Overview

The BD46385G-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 across wide load ranges. 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 switching frequencies up to 2.2MHz, enabling the use of small external inductors and capacitors. The IC includes comprehensive protection features such as overcurrent protection, thermal shutdown, and soft-start functionality.

Feature Summary

• Integrated synchronous rectification with internal high-side and low-side N-channel MOSFETs for improved power conversion efficiency.
• Programmable switching frequency allowing optimization between component size and efficiency performance.
• Built-in protection mechanisms including overcurrent detection, thermal shutdown, and controlled soft-start to ensure reliable operation under fault conditions.

Applications

• Portable consumer electronics requiring efficient power management from single-cell lithium-ion batteries
• Embedded systems and microcontroller boards needing stable low-voltage power rails
• Industrial control modules operating within standard industrial temperature ranges

Procurement Notes

Verify the specific suffix 'TR' indicates tape and reel packaging when ordering. Confirm the exact output voltage setting via external resistor values or fixed options depending on the sub-type variant. Ensure compatibility with your system's input voltage range and required output current capabilities before finalizing procurement specifications.

Selection Notes

Select this component when designing compact power supplies for battery-operated devices where space constraints limit passive component sizes. The high switching frequency allows for smaller inductors compared to lower-frequency alternatives. Consider the thermal performance requirements based on the expected load current and ambient operating conditions to ensure adequate heat dissipation.

Part Context

This part belongs to Rohm's family of synchronous buck converters designed for portable applications. It complements other models in the series that may offer different current ratings or input voltage ranges. The BD46385G-TR specifically targets applications requiring moderate output currents with high efficiency and minimal external component count.

Replacement Considerations

Check datasheets for alternative parts offering similar input voltage ranges and integrated MOSFET configurations. Verify pin-to-pin compatibility if direct replacement is required. Compare switching frequency ranges and protection feature sets to ensure functional equivalence in the target application circuit.

FAQ

What is the minimum output voltage supported by the BD46385G-TR?

The device supports a minimum output voltage of 0.6V, which is determined by its internal reference voltage.

Does the BD46385G-TR include internal compensation?

Yes, the IC features internally compensated error amplifiers, reducing the need for external compensation components and simplifying design.