AOZ1038DI

Overview

The AOZ1038DI is a high-efficiency synchronous buck regulator from the EZBuck family, manufactured by Alpha & Omega Semiconductor Inc. It operates within an input voltage range of 4.5 V to 18 V and delivers up to 6 A of continuous output current. The device features internal switches with 55 mΩ high-side and 12 mΩ low-side resistance, achieving efficiencies up to 95%. Output voltage is adjustable down to 0.8 V via external resistors. It integrates fixed 450 kHz PWM operation, cycle-by-cycle current limit, pre-bias start-up, short-circuit protection, and thermal shutdown. The component is housed in a thermally enhanced 8-lead DFN package with an exposed pad, rated for ambient temperatures between -40 °C and +85 °C.

Feature Summary

• Integrates synchronous buck topology with low on-resistance internal power switches for high efficiency
• Includes comprehensive protection mechanisms such as thermal shutdown, cycle-by-cycle current limit, and short-circuit protection
• Features active high power good status indication and pre-bias start-up capability
• Utilizes a thermally enhanced surface-mount package designed for efficient heat dissipation

Applications

• Point-of-load DC/DC converters
• LCD TV power supplies
• Set-top boxes
• DVD and Blu-ray players/recorders
• PCIe graphics cards

Procurement Notes

Verify the specific suffix DI against the manufacturer datasheet to confirm the package type and pinout configuration. Ensure compatibility with the required input voltage range and output current specifications for the target application. Check for RoHS compliance status and moisture sensitivity level requirements during storage and handling. Confirm availability through authorized distributors as part numbers may have lifecycle variations.

Selection Notes

Select this component when a compact, high-efficiency step-down solution is needed for 5V or 12V bus systems. The 6 A output capacity suits moderate power loads requiring stable regulation. Consider the fixed 450 kHz frequency for balancing component size and efficiency. Evaluate thermal performance based on the PCB copper area connected to the exposed pad, as thermal management is critical for maintaining reliability under full load conditions.

Part Context

The AOZ1038DI belongs to the EZBuck series of synchronous buck regulators, which are designed for ease of use and high performance. This family targets portable and consumer electronics applications where space and efficiency are paramount. The DI suffix typically denotes the 8-lead DFN package variant, distinguishing it from other package options like SO-8 within the same electrical family.

Replacement Considerations

Direct replacements must match the 6 A current rating, 4.5 V to 18 V input range, and 450 kHz switching frequency. Verify pin-to-pin compatibility if substituting in existing layouts. Alternative parts should offer similar efficiency curves and protection features. Consult manufacturer cross-reference lists for verified equivalents.