BD9322EFJ-E2

Overview

The BD9322EFJ-E2 is a synchronous buck switching voltage regulator manufactured by ROHM Semiconductor. It integrates a low-on-resistance power MOSFET into a single chip, supporting an input voltage range of 4.75 V to 18 V and delivering up to 2 A of continuous output current. The device operates with a fixed switching frequency of 380 kHz and provides an adjustable output voltage between 1 V and 15 V. Packaged in an HTSOP-J8 surface-mount format, it functions within a temperature range of -40 °C to +85 °C.

Feature Summary

• Integrates a low on-resistance power MOSFET for high efficiency
• Utilizes current mode control for fast response characteristics
• Requires minimal external components to reduce system cost
• Includes protection circuits such as UVLO, thermal shutdown, and overcurrent protection

Applications

• Industrial equipment power supplies
• Consumer electronics DC-DC conversion
• General purpose step-down voltage regulation

Procurement Notes

Verify the component status before integration, as documentation indicates this specific part may be classified as Not Recommended for New Designs (NRND). Confirm that the HTSOP-J8 package dimensions align with your PCB footprint requirements. Ensure that the 380 kHz switching frequency is compatible with your electromagnetic interference constraints and inductor selection. Validate that the 2 A output current capability meets the peak load demands of your target application circuit.

Selection Notes

Select this component when a compact solution is required for converting 4.75 V to 18 V inputs down to lower voltages at currents up to 2 A. The integrated MOSFET simplifies design compared to discrete solutions. Consider the fixed 380 kHz frequency for inductor sizing. This part is suitable for applications where moderate efficiency and simple phase compensation are prioritized over ultra-low standby power consumption found in constant on-time controllers.

Part Context

This device belongs to the ROHM BD93xx series of integrated MOSFET DC-DC converters. These regulators are designed to offer wide input voltage ranges and high output currents while minimizing external component counts. The series typically employs current mode control to ensure stability and ease of compensation across various operating conditions.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.