BD9D322QWZ-E2

Overview

The BD9D322QWZ-E2 is a single-channel synchronous buck DC/DC converter from ROHM Semiconductor, featuring an integrated power FET and controller. It operates with an input voltage range of 4.5 V to 18 V and provides an adjustable output voltage between 0.765 V and 7 V. The device supports a maximum output current of 3 A and utilizes a constant ON-time control topology for fast transient response. It functions within an operating temperature range of -40 °C to 85 °C and is housed in a compact UMMP008Z2020 package measuring 2.0x2.0 mm with a thickness of 0.4 mm.

Feature Summary

• Integrates a synchronous buck controller and power FET into a single chip to minimize external component count.
• Employs Constant ON-Time control architecture to ensure rapid transient response and stability under varying load conditions.
• Incorporates SLLM™ (Simple Light Load Mode) technology to significantly reduce power consumption during light-load or standby operations.
• Includes comprehensive protection mechanisms such as over-current protection, thermal shutdown, and under-voltage lockout.

Applications

• Portable electronic devices requiring efficient step-down conversion from higher bus voltages.
• Industrial equipment systems needing low standby power consumption.
• Embedded systems utilizing microcontrollers or digital signal processors with 3A current demands.
• Automotive infotainment and body electronics modules operating within specified voltage ranges.

Procurement Notes

Verify the specific suffix E2 against the official datasheet to confirm RoHS compliance and lead-free status. Ensure the UMMP008Z2020 package dimensions align with your PCB footprint requirements. Check for any recent Product Change Notices (PCN) that may affect marking or material specifications. Confirm availability status as distribution data may vary by region and date.

Selection Notes

Select this component when a compact solution is required for 3A loads with an input voltage up to 18 V. The integrated FET design simplifies layout compared to discrete solutions. Consider the SLLM feature if system efficiency at light loads is critical. Verify that the 0.765 V minimum output voltage meets the target rail requirements. Ensure thermal management strategies account for the small package size during high-current operation.

Part Context

This part belongs to the BD9D series of integrated MOSFET DC-DC converters from ROHM. These devices are designed for applications demanding high efficiency and small form factors. The series typically features constant ON-time control and light-load optimization. The BD9D322QWZ-E2 specifically targets markets requiring robust performance in automotive and industrial environments with strict space constraints.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Consult ROHM technical support or authorized distributors for direct replacements or pin-compatible alternatives within the BD9D family.