AOZ1033AI_2#A

Overview

The AOZ1033AI#A is a synchronous buck regulator IC from the EZBuck series by Alpha & Omega Semiconductor. It operates with an input voltage range of 4.5V to 18V and delivers up to 3A of continuous output current. The output voltage is adjustable down to 0.8V. Key electrical parameters include a fixed switching frequency of 600kHz, internal high-side switch resistance of 80mΩ, and low-side switch resistance of 30mΩ. Efficiency reaches up to 95%. The device features pulse skipping at light loads, cycle-by-cycle current limit, pre-bias start-up, short-circuit protection, and thermal shutdown. It is housed in an 8-SOIC package and rated for ambient temperatures between -40°C and +85°C.

Feature Summary

• Synchronous buck topology with integrated high-side and low-side switches
• High efficiency up to 95% with pulse skipping mode at light loads
• Comprehensive protection including thermal shutdown, short-circuit, and cycle-by-cycle current limit

Applications

• Point of load DC/DC converters
• LCD TV set top boxes
• DVD/Blu-ray players/recorders
• Cable modems
• PCIe graphics cards

Procurement Notes

Verify component authenticity through authorized channels as this part is listed as obsolete. Confirm final assembly compatibility regarding moisture sensitivity level MSL 1. Review manufacturer product change notices for any historical revisions affecting pinout or electrical characteristics before integration into new designs.

Selection Notes

Select this regulator for applications requiring a compact solution with up to 3A output current within a 4.5V to 18V input window. The 8-SOIC package suits space-constrained designs. Ensure thermal management aligns with the -40°C to +85°C operating range. Consider the fixed 600kHz frequency when designing external passive components for optimal ripple performance.

Part Context

The AOZ1033AI belongs to the EZBuck family of synchronous buck regulators. Related parts include the AOZ1031 (3A), AOZ1034 (4A), and AOZ1036 (5A). These devices share similar control architectures but vary in current handling capabilities and packaging options. The AOZ1033AI specifically targets mid-current applications requiring high efficiency and simple implementation.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.