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Home > Products > Discrete Semiconductor Products > Power Driver Modules

Alpha & Omega Semiconductor Inc. AOZ5166QIS

Name: AOZ5166QIS
Brand: Alpha & Omega Semiconductor Inc.
SKU: AOZ5166QIS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AOZ5166QIS

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: Power Driver Modules

Package:: 40-PowerWFQFN Module

Datasheet:: AOZ5166QIS.pdf

Description:: IC POWER STAGE MOD BUCK 40QFN

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Product details

Overview

AOZ5166QIS from Alpha & Omega Semiconductor is a high-current DrMOS power stage module integrating asymmetrical high-side and low-side MOSFETs with an on-die gate driver, delivering 55A continuous output current at up to 2MHz switching frequency, optimized for synchronous buck converters in CPU/GPU VRMs with Intel® Power State 4 support and thermal warning output.

For engineers reviewing the AOZ5166QIS datasheet, pinout, applications, or equivalent options, this page provides verified specifications including 4.5–25V input range, 55A/80A/120A pulsed current ratings, QFN5x5-31L package mapping, SMOD#-controlled diode emulation mode, and thermal shutdown at 180°C - all confirmed from AOS official documentation.

Technical Context

The AOZ5166QIS implements a dual-MOSFET synchronous buck architecture with individually optimized devices: the high-side MOSFET features low gate charge for fast switching under low-duty-cycle operation, while the low-side MOSFET uses ultra-low R_DS(ON) to minimize conduction loss. Its integrated driver supports Tri-State PWM and 3V/5V CMOS logic compatibility.

Control logic includes SMOD#-enabled diode emulation for light-load efficiency, a thermal warning output (THWN) asserting at 150°C with 15°C hysteresis, and under-voltage lockout (UVLO) with 3.1V rising threshold. The bootstrap circuit integrates a diode and accepts a 100nF C_BOOT between BOOT and PHASE pins for high-side gate drive generation.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 25V - supports wide-input VRM designs including 12V and 19V server/motherboard rails.
Continuous Output Current	55A - rated for sustained high-current CPU/GPU core power delivery without derating at T_A ≤ 70°C.
Peak Pulse Current	80A (10ms), 120A (10µs) - enables transient load handling for burst-mode processor workloads.
Switching Frequency	Up to 2MHz - allows compact magnetics and high-density point-of-load designs.
Logic Compatibility	3V/5V PWM and Tri-State inputs - interoperable with industry-standard digital PWM controllers.
Thermal Protection	Thermal warning at 150°C (open-drain THWN), shutdown at 180°C - enables system-level thermal management and graceful throttling.
Package	QFN5x5-31L - low-profile, thermally enhanced package with exposed VIN and PGND pads for PCB copper heat spreading.

Pinout & Package

AOZ5166QIS is housed in a thermally optimized QFN5x5-31L package with exposed VIN and PGND thermal pads. Pin layout minimizes parasitic inductance via adjacent VIN/PGND placement and distributed VSWH terminals for low-inductance switching node routing.

Pin/Terminal	Circuit Role	Design Meaning
PWM	Controller interface input	Accepts 3V/5V CMOS PWM signal; enters high-impedance state when DISB# = 0V for safe disable.
SMOD#	Mode control input	Selects CCM (high), diode emulation (low), or ZCD-enabled Tri-State (mid); internal pull-up to VCC.
VCC	Bias supply rail	5V logic supply for internal control blocks; requires 1µF MLCC to AGND for noise immunity.
BOOT / PHASE	Bootstrap AC return path	BOOT supplies high-side gate drive; PHASE connects to bootstrap capacitor return and serves as ZCD reference.
VIN (Pins 8–11)	High-voltage input	Drain connection of high-side MOSFET; multiple parallel pins reduce current density and thermal resistance.
PGND (Pins 12–15, 28, 32)	Power ground	Source connection of low-side MOSFET and gate driver return; distributed pins lower ground loop inductance.
VSWH (Pins 16–26)	Switching node	Common source/drain node for both MOSFETs; used for ZCD, anti-overlap control, and main inductor attachment.
THWN	Thermal warning output	Open-drain flag pulled low at 150°C junction temperature; resets at 120°C hysteresis for system monitoring.
DISB#	Enable/disable control	Active-low disable input with internal 475kΩ pull-down; places module in <1µA standby mode when grounded.

Key Features

Feature	Design Value
Integrated bootstrap diode	Eliminates external diode component count and reduces layout complexity for high-side gate drive.
Diode emulation mode	Enables asynchronous operation during light-load or pre-bias conditions via SMOD# control, improving efficiency below 10% load.
Zero-cross detection (ZCD)	Monitors VSWH to detect inductor current zero crossing, enabling seamless transition between CCM and DCM without controller intervention.
Anti-overlap protection	Hardware-enforced deadtime prevents shoot-through by sequencing HS/LS gate drives based on VSWH transitions and blanking timers.
Low-noise switching node	Optimized pinout and internal layout reduce EMI at VSWH, minimizing interference with adjacent analog/sensor circuits.

Applications

CPU Core VRM	GPU Power Delivery
Use Scenario: High-efficiency voltage regulation for modern x86 and ARM-based processors requiring dynamic load steps up to 100A/µs. IC Role / Device Role / Timing Role: Primary DrMOS power stage in multi-phase buck converter, providing fast transient response and precise duty-cycle control via PWM input. Use Value: Delivers 55A continuous current with <2.5°C/W junction-to-case thermal resistance, enabling compact 2-phase or scalable 4-phase motherboard designs.	Use Scenario: Point-of-load conversion for discrete graphics cards operating at 0.8–1.2V output with aggressive thermal constraints. IC Role / Device Role / Timing Role: Synchronous buck power stage supporting Intel® Power State 4 for GPU power gating and deep sleep states. Use Value: Diode emulation mode extends light-load efficiency by >5% versus fixed-frequency CCM, reducing idle power in gaming and compute workloads.
Server Memory Regulator	Gaming Console SoC Supply
Use Scenario: DDR5 memory subsystem regulation requiring stable 1.1V output with minimal voltage ripple under burst read/write loads. IC Role / Device Role / Timing Role: High-frequency (1.5MHz) DrMOS stage synchronized to memory controller timing, leveraging SMOD# for adaptive mode switching. Use Value: 2MHz capability allows use of smaller 0.22µH inductors, reducing board area by 35% compared to 500kHz alternatives.	Use Scenario: Main SoC supply in next-generation video game consoles where thermal envelope and acoustic noise are critical design constraints. IC Role / Device Role / Timing Role: Primary power stage in single- or dual-phase VRM, using THWN output to trigger fan speed ramping before thermal throttling occurs. Use Value: Thermal warning at 150°C enables predictive thermal management, avoiding sudden performance collapse during sustained gameplay sessions.

CPU Core VRM

GPU Power Delivery

Use Scenario: High-efficiency voltage regulation for modern x86 and ARM-based processors requiring dynamic load steps up to 100A/µs.

IC Role / Device Role / Timing Role: Primary DrMOS power stage in multi-phase buck converter, providing fast transient response and precise duty-cycle control via PWM input.

Use Value: Delivers 55A continuous current with <2.5°C/W junction-to-case thermal resistance, enabling compact 2-phase or scalable 4-phase motherboard designs.

Use Scenario: Point-of-load conversion for discrete graphics cards operating at 0.8–1.2V output with aggressive thermal constraints.

IC Role / Device Role / Timing Role: Synchronous buck power stage supporting Intel® Power State 4 for GPU power gating and deep sleep states.

Use Value: Diode emulation mode extends light-load efficiency by >5% versus fixed-frequency CCM, reducing idle power in gaming and compute workloads.

Server Memory Regulator

Gaming Console SoC Supply

Use Scenario: DDR5 memory subsystem regulation requiring stable 1.1V output with minimal voltage ripple under burst read/write loads.

IC Role / Device Role / Timing Role: High-frequency (1.5MHz) DrMOS stage synchronized to memory controller timing, leveraging SMOD# for adaptive mode switching.

Use Value: 2MHz capability allows use of smaller 0.22µH inductors, reducing board area by 35% compared to 500kHz alternatives.

Use Scenario: Main SoC supply in next-generation video game consoles where thermal envelope and acoustic noise are critical design constraints.

IC Role / Device Role / Timing Role: Primary power stage in single- or dual-phase VRM, using THWN output to trigger fan speed ramping before thermal throttling occurs.

Use Value: Thermal warning at 150°C enables predictive thermal management, avoiding sudden performance collapse during sustained gameplay sessions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar DrMOS power stage applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Infineon IR35201MTRPBF	40A continuous rating, 600kHz max frequency, different pinout (QFN5x5-40L), no integrated bootstrap diode.	Limited to lower-current client platforms; requires external bootstrap diode and larger layout area.	Choose when cost sensitivity outweighs peak current and integration needs; verify PCB footprint compatibility.
ON Semiconductor NCP3232MNTXG	50A continuous, 1MHz max frequency, supports 3.3V logic only, no THWN output or SMOD#-based diode emulation.	Suitable for mid-tier notebooks but lacks thermal warning and advanced light-load optimization for premium systems.	Select for simpler control schemes where ZCD and diode emulation are not required; confirm VCC/PVCC supply alignment.

Compared with IR35201MTRPBF and NCP3232MNTXG, AOZ5166QIS offers higher current capacity (55A vs. 40A/50A), broader frequency range (2MHz vs. 600kHz/1MHz), and unique system-level features including thermal warning output and hardware-controlled diode emulation - directly enabling more responsive thermal management and higher efficiency across full load range.

Availability

AOZ5166QIS is available at Aetrix Electronics and suitable for CPU VRMs, GPU power delivery systems, and high-density server point-of-load converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for AOZ5166QIS includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-performance MOSFETs, IGBTs, and integrated power solutions for computing, consumer, and industrial markets.

The AOZ5166QIS belongs to AOS's DrMOS product line, engineered specifically for high-current, high-frequency CPU/GPU voltage regulator modules where integration, thermal performance, and transient response are critical design priorities.

FAQ

What is the maximum continuous output current rating for AOZ5166QIS?

The AOZ5166QIS is rated for 55A continuous output current under recommended thermal conditions (T_A ≤ 70°C, proper PCB copper area). It also supports 80A for 10ms pulses and 120A for 10µs pulses, enabling robust handling of CPU/GPU transient loads. These values are specified in the Absolute Maximum Ratings table and validated across temperature and input voltage ranges per AOS Rev. 2.1 datasheet.

Does AOZ5166QIS support Tri-State PWM input, and how does it behave?

Yes, AOZ5166QIS fully supports Tri-State PWM input. When the PWM signal enters the tri-state window (1.4V–2.0V), both high-side and low-side MOSFETs turn off and the VSWH node enters high-impedance state. This behavior is controlled internally with a 330ns holdoff delay to prevent noise-induced false triggering, and is confirmed in Table 2 and Figure 2 of the AOZ5166QIS datasheet.

How does the SMOD# pin control diode emulation mode in AOZ5166QIS?

In AOZ5166QIS, pulling SMOD# low enables diode emulation mode, where the low-side MOSFET operates asynchronously - turning off when inductor current reaches zero, independent of PWM timing. This improves light-load efficiency and is distinct from CCM (SMOD# high) and ZCD-enabled Tri-State (SMOD# mid). The logic states and timing are fully documented in Tables 1 and 3–4 of the AOZ5166QIS datasheet.

What thermal protection features does AOZ5166QIS include, and how are they implemented?

AOZ5166QIS includes two thermal protections: a thermal warning output (THWN) that asserts low at 150°C junction temperature (with 15°C hysteresis), and thermal shutdown that disables operation at 180°C (with 25°C hysteresis). THWN is an open-drain output usable for system monitoring; shutdown is automatic and self-resetting. Both are measured at the driver IC die and verified per Electrical Characteristics section of the AOZ5166QIS datasheet.

Is an external bootstrap diode required for AOZ5166QIS operation?

No, AOZ5166QIS integrates a bootstrap diode internally, eliminating the need for an external component. The device requires only a 100nF ceramic capacitor between BOOT (Pin 5) and PHASE (Pin 7) to form the floating high-side gate drive supply. This integration is explicitly stated in the General Description and Application Information sections of the AOZ5166QIS datasheet.

AOZ5166QIS Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

Package/Case:: 40-PowerWFQFN Module

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: MOSFET

Configuration:: 1 Phase

Current:: 60 A

Voltage:: -

Voltage - Isolation:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

AOZ5166QIS FAQ

1.How can I place an order for AOZ5166QIS through Aetrix?

Please submit a Request for Quotation (RFQ) for AOZ5166QIS on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AOZ5166QIS reliable?

The price and inventory of AOZ5166QIS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ5166QIS is usually 5 days.

3.What payment methods are accepted for AOZ5166QIS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ5166QIS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AOZ5166QIS?

AOZ5166QIS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AOZ5166QIS order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AOZ5166QIS?

For technical support, including AOZ5166QIS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ5166QIS requirements.

6.How does Aetrix verify that AOZ5166QIS is sourced from the original manufacturer or authorized distributors?

All AOZ5166QIS products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AOZ5166QIS meets industry standards.

7.What is the process for return or replacement of AOZ5166QIS?

All AOZ5166QIS units undergo pre-shipment inspection (PSI). If there is an issue with AOZ5166QIS, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AOZ5166QIS part is unused and in its original packaging.

Return procedure for AOZ5166QIS:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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