BD9D323QWZ-E2

Overview

The BD9D323QWZ-E2 is a synchronous buck DC-DC converter manufactured by ROHM Semiconductor. It features an integrated power FET and controller within a compact UMMP008Z2020 package measuring 2.0x2.0 mm with a thickness of 0.4 mm. The device supports an input voltage range from 4.5 V to 18 V, delivering a maximum output current of 3 A. The adjustable output voltage spans from 765 mV to 7 V. Key electrical specifications include a switching frequency of up to 700 kHz, a quiescent current of 2 µA, and an operating supply current of 1 mA. It operates reliably across a temperature range of -40°C to +85°C.

Feature Summary

• Employs constant on-time control architecture for rapid transient response and stable operation under varying load conditions.
• Integrates Simple Light Load Mode (SLLM) technology to minimize power consumption during light-load or standby states.
• Includes comprehensive protection mechanisms such as over-current protection, thermal shutdown, and under-voltage lockout.
• Features an adjustable soft-start function to limit inrush current during startup sequences.

Applications

• Portable electronic devices requiring low standby power consumption
• Battery-powered equipment utilizing wide input voltage ranges
• Embedded systems needing compact power management solutions

Procurement Notes

Verify component authenticity through authorized channels due to end-of-life status. Confirm package orientation and pinout compatibility with existing PCB layouts. Ensure thermal design accounts for backside heat dissipation requirements inherent to the UMMP008Z2020 package. Validate that input and output capacitor selections meet the ripple current specifications defined in the official datasheet.

Selection Notes

Select this component when space constraints necessitate a small footprint combined with high efficiency at light loads. The integrated FET simplifies design by reducing external component count. Consider the 700 kHz switching frequency for balancing size and efficiency. Verify that the required output voltage falls within the 765 mV to 7 V adjustable range.

Part Context

This part belongs to the BD9D323 series of single-channel synchronous buck converters. It shares architectural similarities with other members like the BD9D322QWZ-E2 but may differ in specific packaging or minor electrical characteristics. The series is designed for applications prioritizing miniaturization and energy efficiency in portable electronics.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Due to the end-of-life status, direct replacements should be sourced only if officially documented by the manufacturer. Evaluate alternative packages within the same family for potential form-factor compatibility.