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Diodes Incorporated AUR9721AGD
- Part No.:
- AUR9721AGD
- Manufacturer:
- Diodes Incorporated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
AUR9721AGD.pdf
- Description:
- IC REG BUCK ADJ 2A 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,635
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Product details
Overview
AUR9721AGD from Diodes Incorporated is a synchronous step-down DC-DC converter optimized for portable electronics, delivering up to 2A output current with 1.5MHz fixed switching frequency, adjustable output voltage (0.8V to 0.9×VIN), and integrated high-side/low-side MOSFETs in a DFN-3×3-10 package. It operates across 2.7V–5.5V input and supports post-regulation in space-constrained systems.
For engineers reviewing the AUR9721AGD datasheet, AUR9721AGD pinout, AUR9721AGD application, or AUR9721AGD equivalent, key selection criteria include its 0.8V feedback reference, 90% maximum duty cycle for low-dropout operation, thermal shutdown at +150°C, and EN-active-high enable logic with 1.5V threshold - all critical for battery-powered and thermally sensitive designs.
Technical Context
The AUR9721AGD implements peak-current mode control with internal oscillator and soft-start circuitry, enabling stable transient response and controlled power-up sequencing. Its synchronous rectification eliminates external Schottky diodes, while built-in overcurrent, UVLO (2.4V rising), and thermal shutdown protections ensure robust operation under fault conditions.
Feedback regulation uses a precision 0.8V bandgap reference with ±2% accuracy (±3% over temperature and load), and the error amplifier drives the PWM modulator directly. The dual-power-switch architecture features matched 100mΩ PMOS and NMOS RON, supporting high efficiency (>90% at 1A, 3.3VOUT) across wide load and input ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous - supports core voltage rails for SoCs and FPGAs in compact consumer devices |
| Switching Frequency | 1.5MHz (typ) - enables use of ≤2.2μH inductors and 47μF ceramic output capacitors |
| Feedback Voltage | 0.8V ±2% - sets output via resistor divider; allows 0.8V–4.95V adjustable range with VIN=5.5V |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion, USB 5V, and regulated 3.3V/5V system rails |
| Max Duty Cycle | 90% - enables low-dropout operation down to VOUT ≥ 0.9×VIN (e.g., 4.5V→4.05V) |
| UVLO Threshold | 2.4V (rising), 2.3V (falling) - prevents erratic startup during brown-out and ensures clean power sequencing |
| Thermal Shutdown | +150°C junction - protects against sustained overload or poor PCB thermal design |
Pinout & Package
Package: DFN-3×3-10, wettable flank, exposed thermal pad (pin 1 marked).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback input | Connects to resistor divider output; regulates VOUT to 0.8V reference |
| 2,9 GND | Power ground | Common return for NMOS switch, error amp, and bias circuits; requires low-impedance PCB connection to thermal pad |
| 3,8 SW | Switch node | Drives external inductor; carries high di/dt; must minimize trace inductance and EMI coupling |
| 4,7 VIN | Input power supply | Accepts 2.7–5.5V; bypassed with 47μF ceramic capacitor close to pins 4/7 |
| 5,6 NC | No internal connection | Not bonded; must remain unconnected and un-routed on PCB |
| 10 EN | Enable control | Active-high logic input; 1.5V threshold ensures compatibility with 1.8V/3.3V GPIOs |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Integrated 100mΩ PMOS/NMOS switches eliminate external diode losses and improve light-load efficiency |
| Internal Soft Start | 800μs ramp time prevents inrush current and output overshoot during power-up |
| Thermal Shutdown with Hysteresis | +150°C trip with ~30°C hysteresis ensures safe cooldown before automatic recovery |
| High Efficiency at Light Load | 460μA typical operating current (at VFB=0.95V) reduces quiescent power in standby modes |
| Low Dropout Operation | 90% max duty cycle enables VOUT ≥ 0.9×VIN, critical for battery voltage tracking applications |
Applications
| LCD TV Power Management | Set-Top Box Core Rail |
|---|---|
Use Scenario: Regulating 3.3V or 5V from main 12V rail for TCON and audio subsystems. IC Role / Device Role / Timing Role: Primary buck regulator providing stable, low-noise core voltage with fast transient response. Use Value: 1.5MHz switching minimizes EMI interference with video signals; 2A capability supports multi-channel audio ICs. | Use Scenario: Generating 1.2V/1.8V CPU core voltage from 5V USB or wall adapter input. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with adjustable feedback for precise core voltage tuning. Use Value: 0.8V reference and ±3% output accuracy meet SoC core rail tolerance requirements without external trimming. |
| Notebook Computer I/O Rail | PCI Card Auxiliary Supply |
Use Scenario: Providing 3.3V auxiliary power for USB controllers and card readers in ultrabooks. IC Role / Device Role / Timing Role: Compact, thermally efficient buck converter replacing discrete solutions in tight layout spaces. Use Value: DFN-3×3-10 footprint saves >40% board area vs. SO-8 equivalents; thermal pad enables 2.2W dissipation on 4-layer PCB. | Use Scenario: Delivering 2.5V or 3.3V from PCIe slot 3.3V rail for add-in card peripherals. IC Role / Device Role / Timing Role: Post-regulator ensuring clean, ripple-free supply despite noisy host bus voltage. Use Value: Integrated soft-start and short-circuit protection prevent bus faults during hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP63205WU-7 | 2A, 1.5MHz, 2.7–6V input, but uses external compensation and lacks integrated soft-start timer | Requires additional RC network for loop stability; less suitable for rapid prototyping | Prefer when custom loop response tuning is needed and board space permits extra components |
| MP2143GQ-Z | 2A, 2MHz, 2.5–6V input, 0.6V feedback, but higher quiescent current (250μA vs. 460μA active) | Better for ultra-compact layouts due to higher fSW; less optimal for battery standby duration | Choose for space-constrained designs where 2MHz enables <1μH inductors, accepting higher IQ in active mode |
Compared with AP63205WU-7 and MP2143GQ-Z, the AUR9721AGD offers integrated soft-start and lower active current, making it preferable for cost-sensitive, production-ready designs requiring minimal external components and long battery life - though it is obsolete and requires careful lifecycle planning.
Availability
AUR9721AGD is available at Aetrix Electronics and suitable for LCD TV power management, set-top box core rails, and notebook computer I/O regulation requiring stable component supply despite end-of-life status.
Supply support for AUR9721AGD 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-performance power management, signal integrity, and protection solutions.
The AUR9721 belongs to Diodes' high-frequency synchronous buck converter product line, designed specifically for space-constrained portable and consumer electronics requiring low-profile, high-efficiency DC-DC conversion with minimal external components.
FAQ
Is the AUR9721AGD still in production?
No - Diodes Incorporated has discontinued the AUR9721AGD (marked "OBSOLETE – PART DISCONTINUED" in DS43784 Rev. 1-4). Aetrix Electronics maintains limited legacy stock and supports last-time-buy programs with full traceability and documentation for ongoing production needs.
What is the thermal pad connection requirement for the DFN-3×3-10 package?
The exposed thermal pad (EP) must be soldered to a dedicated PCB copper pour connected to GND via ≥4 thermal vias (0.3mm diameter) to an inner ground plane. Failure to do so limits power dissipation to <1.1W and risks thermal shutdown at ≤1.5A load under ambient >60°C.
Can the AUR9721AGD operate with input voltage below 2.7V?
No - the absolute minimum recommended input is 2.7V per datasheet Section 4. Absolute Maximum Ratings allow 0V, but functional operation below 2.7V violates Recommended Operating Conditions. UVLO activates at 2.3V falling threshold, preventing regulation and causing output collapse.
How is output voltage adjusted using the FB pin?
VOUT = 0.8V × (1 + R1/R2), where R2 connects FB to GND and R1 connects FB to VOUT. R2 should be 400kΩ–80kΩ to maintain FB bias current between 2–10μA; R1×C1 compensation network must be 3–6μs for stability with 1.2μH inductors.
AUR9721AGD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 4.95V
- Current - Output:
- 2A
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 80°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (3x3)
AUR9721AGD FAQ
1.How can I place an order for AUR9721AGD through Aetrix?
Please submit a Request for Quotation (RFQ) for AUR9721AGD 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 AUR9721AGD reliable?
The price and inventory of AUR9721AGD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AUR9721AGD is usually 5 days.
3.What payment methods are accepted for AUR9721AGD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AUR9721AGD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AUR9721AGD?
AUR9721AGD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AUR9721AGD 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 AUR9721AGD?
For technical support, including AUR9721AGD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AUR9721AGD requirements.
6.How does Aetrix verify that AUR9721AGD is sourced from the original manufacturer or authorized distributors?
All AUR9721AGD 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 AUR9721AGD meets industry standards.
7.What is the process for return or replacement of AUR9721AGD?
All AUR9721AGD units undergo pre-shipment inspection (PSI). If there is an issue with AUR9721AGD, 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 AUR9721AGD part is unused and in its original packaging.
Return procedure for AUR9721AGD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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