BD9D320EFJ-E2

Overview

The BD9D320EFJ-E2 is a synchronous step-down DC/DC converter from Rohm Semiconductor, designed for high-efficiency power conversion in portable and industrial applications. It integrates two N-channel MOSFETs and operates with an input voltage range of 2.7V to 5.5V. The device supports output currents up to 3A with adjustable output voltages via external resistors. Key electrical parameters include a switching frequency selectable between 400kHz and 1.6MHz, ensuring compact passive component sizes. It features integrated protection mechanisms such as over-current protection, thermal shutdown, and soft-start functionality to ensure reliable operation under varying load conditions.

Feature Summary

• Integrated dual N-channel MOSFETs for high efficiency
• Adjustable switching frequency for optimized design flexibility
• Comprehensive protection including OCP, OTP, and soft-start

Applications

• Portable electronic devices requiring efficient power management
• Industrial control systems needing stable low-voltage supplies
• Consumer electronics with space-constrained PCB layouts

Procurement Notes

Verify the exact suffix 'E2' corresponds to the specific tape-and-reel packaging configuration required for your assembly line. Confirm that the operating temperature range meets your environmental specifications. Ensure compatibility with your target output voltage setting by checking the feedback resistor network requirements against the datasheet recommendations.

Selection Notes

Select this component when a compact solution is needed for converting 5V inputs to lower voltages like 3.3V or 1.8V. Consider its fixed-frequency operation if EMI filtering constraints are strict. Evaluate the need for external compensation versus internal stability based on your capacitor selection strategy.

Part Context

This part belongs to Rohm's BD9 series of synchronous buck converters, known for integrating power switches to reduce board space. It targets applications where efficiency and size are critical, offering a balance between performance and cost compared to discrete solutions.

Replacement Considerations

Check for pin-compatible alternatives within the same family, such as the BD9D300EFJ-E2, which may offer different current ratings. Verify that any substitute maintains the same package type (HTSOP-J8) and thermal characteristics to avoid redesigning the PCB footprint.