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AOZ2261QI-18
Alpha & Omega Semiconductor Inc.
IC REG BUCK ADJ 8A 23QFNB
75212 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 0.8V 1 Output 8A 23-PowerTFQFN
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*Quantity
Minimum 1
Minimum 1
5.0 / 5.0
- (504 Ratings)
AOZ2261QI-18
Product Overview
11222674
DiGi Electronics Part Number
AOZ2261QI-18-DGManufacturer
Alpha & Omega Semiconductor Inc.
AOZ2261QI-18
Description
IC REG BUCK ADJ 8A 23QFNBInventory
75212 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 0.8V 1 Output 8A 23-PowerTFQFN
Quantity
Minimum 1
Minimum 1
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AOZ2261QI-18 Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - DC DC Switching Regulators
Packaging
Tape & Reel (TR)
Series
EZBuck™
Product Status
Active
Function
Step-Down
Output Configuration
Positive
Topology
Buck
Output Type
Adjustable
Number of Outputs
1
Voltage - Input (Min)
2.7V
Voltage - Input (Max)
28V
Voltage - Output (Min/Fixed)
0.8V
Voltage - Output (Max)
23.8V
Current - Output
8A
Frequency - Switching
500kHz
Synchronous Rectifier
Yes
Operating Temperature
-40°C ~ 85°C (TA)
Mounting Type
Surface Mount
Package / Case
23-PowerTFQFN
Supplier Device Package
23-QFNB (4x4)
Datasheet & Documents
HTML Datasheet
AOZ2261QI-18-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
REACH Status
REACH Unaffected
Additional Information
Other Names
785-AOZ2261QI-18TR
5202-AOZ2261QI-18TR
Standard Package
3,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
Leur gamme offre une grande fiabilité à des prix qui défient la concurrence.
Dec 02, 2025
配達が迅速で、すぐに必要な商品を手に入れることができました。
Dec 02, 2025
Their after-sales service is fast, reliable, and genuinely caring.
Dec 02, 2025
The efficiency of their shipping process made my shopping experience worry-free.
Dec 02, 2025
Their product diversity ensures I always find exactly what I need without compromise.
Dec 02, 2025
Speedy shipping and competitive pricing—simply outstanding.
Dec 02, 2025
Transparent prices at DiGi Electronics help me make quick, confident purchasing decisions.
Dec 02, 2025
I have always received my orders promptly, thanks to their efficient shipping system.
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the AOZ2261QI-18 in a high-current industrial application near its 8A output limit?
When designing with the AOZ2261QI-18 at or near its 8A maximum output current, thermal management is a critical risk. Even with its integrated synchronous rectifier, the 23-PowerTFQFN package can experience significant temperature rise under continuous load. To mitigate this, ensure at least 2oz copper pours on power and ground planes, use multiple thermal vias under the exposed pad, and avoid daisy-chained ground stitching. Additionally, derate the output current by 15–20% above 60°C ambient to maintain reliability. Consider ambient airflow or forced cooling if operating above 70°C. Monitoring the inductor DCR and avoiding saturation during load transients is also critical to prevent overcurrent trips or inductor overheating.
How does the AOZ2261QI-18 compare to the TI TPS54620 in terms of input voltage range and thermal performance for 24V rail applications?
The AOZ2261QI-18 supports up to 28V input, making it well-suited for 24V industrial systems, while the TPS54620 maxes out at 20V, limiting its compatibility. This gives the AOZ2261QI-18 a clear advantage in legacy 24V equipment upgrades. In thermal performance, both use thermally enhanced packages, but the AOZ2261QI-18’s 23-QFNB offers better thermal resistance (typically 25°C/W junction-to-board) compared to the TPS54620’s HTSSOP, especially with proper PCB layout. However, the TPS54620 has better EMI performance due to spread-spectrum features absent in the AOZ2261QI-18. Choose the AOZ2261QI-18 for higher input voltage tolerance and slightly better thermal headroom, but consider external filtering for EMI compliance.
What layout guidelines are essential for minimizing noise and instability when integrating the AOZ2261QI-18 in sensitive mixed-signal systems?
To minimize noise with the AOZ2261QI-18 in mixed-signal designs, keep the high-current power loop (input capacitor → AOZ2261QI-18 → inductor → output capacitor) as small and direct as possible—ideally under 10mm total trace length. Use low-ESR ceramic capacitors (X7R or X5R) with total input capacitance ≥10μF placed within 3mm of VIN and PGND. Route sensitive analog traces away from the inductor and switching node, and avoid splitting ground planes beneath the IC. Utilize the exposed thermal pad as a solid ground connection with multiple vias. Consider adding a small ferrite bead and RC snubber (10Ω + 1nF) at the switching node if ringing exceeds 2V overshoot during switching transitions.
Can the AOZ2261QI-18 be used as a drop-in replacement for the MP2161 in a 12V to 3.3V/6A power stage, and what modifications are required?
The AOZ2261QI-18 is not a direct drop-in replacement for the MP2161 due to differences in pinout, package (23-QFNB vs. 10-MSOP), and control architecture. While both are synchronous buck regulators, the AOZ2261QI-18 requires external feedback resistors for adjustable output and has enable, soft-start, and frequency synchronization pins not present in the MP2161. To replace, redesign the layout to accommodate the QFN package with proper thermal anchoring and re-calculate feedback resistors using the AOZ2261QI-18’s 0.8V reference. Additionally, verify inductor saturation current exceeds 7.5A and adjust input capacitance to handle the higher input voltage range (up to 28V). Ensure control signals are compatible with the enable threshold (1.4V typical).
What reliability concerns should be addressed when deploying the AOZ2261QI-18 in automotive environments with wide temperature cycling?
In automotive applications, the AOZ2261QI-18’s -40°C to 85°C operating temperature range may require derating, especially under hood where ambient can exceed 85°C. Use derated components (e.g., 50V-rated input caps for 24V systems) to handle transients like load dump. Ensure PCB finishes are ENIG or immersion silver to resist thermal fatigue from cycling. Solder joints under the large QFN ground pad are prone to cracking—use a symmetric thermal via array and avoid center-only via placement. Also, monitor output ripple voltage over life; electrolytic capacitors degrade faster at high temperatures—prefer polymer or high-temperature ceramics. Finally, conformal coating may be needed to prevent condensation or contamination in humid environments.
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AOZ2261QI-18 CAD Models
Alpha & Omega Semiconductor Inc. AOZ2261QI-18 PCB symbols & footprints
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