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Diodes Incorporated AUR9705AUGD
- Part No.:
- AUR9705AUGD
- Manufacturer:
- Diodes Incorporated
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
AUR9705AUGD.pdf
- Description:
- IC REG BUCK ADJ 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,439
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Product details
Overview
AUR9705AUGD from BCD Semiconductor is a 1.5MHz, 1A synchronous step-down DC-DC converter with adjustable output (1V–3.3V), integrated PMOS/NMOS power switches, and automatic PWM/LDO mode switching. It operates from 2.5V–5.5V input, delivers up to 1A continuous load, and features 600mV feedback reference voltage-designed for compact portable power rails in mobile phones and handheld instruments.
For engineers reviewing the AUR9705AUGD datasheet, AUR9705AUGD pinout, AUR9705AUGD application, or AUR9705AUGD equivalent, key selection criteria include its 1.5MHz fixed-frequency operation enabling small external magnetics, thermal shutdown at 160°C, UVLO threshold of 1.8V with 0.1V hysteresis, and WDFN-2×2-6 package suitability for high-density PCB layouts.
Technical Context
The AUR9705AUGD employs constant-frequency peak-current-mode control with internal compensation, eliminating need for external loop components. Its synchronous rectification uses integrated 0.25Ω PMOSFET and 0.27Ω NMOSFET switches, reducing conduction loss and removing requirement for external Schottky diode.
It dynamically transitions between PWM and LDO modes based on load current to maintain high efficiency across 0–1A range. The built-in 1.5MHz oscillator and soft-start circuit ensure stable startup with controlled inrush, while feedback accuracy of ±3% over full input/load/temperature range supports precise regulation in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.5 MHz (enables use of ≤2.2μH inductors and 10μF ceramic output capacitors) |
| Output Current | 1 A continuous (supports single-core SoC or multi-rail PMIC subsystems) |
| Input Voltage Range | 2.5 V to 5.5 V (compatible with Li-ion, Li-poly, and USB-powered systems) |
| Feedback Reference | 600 mV ±2.5% (sets output via resistor divider; enables 1V–3.3V adjustment) |
| Quiescent Current | 100 μA at zero load (minimizes standby power loss in always-on circuits) |
| UVLO Threshold | 1.8 V rising with 0.1 V hysteresis (prevents erratic startup during brown-out conditions) |
| Thermal Shutdown | 160 °C junction temperature (protects against sustained overload or poor heatsinking) |
Pinout & Package
Package: WDFN-2×2-6 with exposed thermal pad (0.65 mm pitch, 2.0 mm × 2.0 mm footprint).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No internal connection | Floating or tied to GND per layout best practice; no functional signal path |
| 2 (EN) | Enable control input | Active-high logic interface (1.5 V min high, 0.6 V max low); controls full device shutdown |
| 3 (VIN) | Main power input | Accepts 2.5–5.5 V supply; feeds internal regulators and power switches |
| 4 (FB) | Feedback sensing node | Monitors resistive divider output; regulates VOUT to 600 mV at this pin |
| 5 (GND) | Power ground reference | Common return for NMOS switch and analog circuitry; must connect to low-impedance system ground |
| 6 (LX) | Switch node | Connects to inductor; carries high dv/dt switching waveform; requires tight layout to minimize EMI |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 0.25Ω PMOS + 0.27Ω NMOS switches eliminate external Schottky diode and associated losses |
| Automatic PWM/LDO mode switching | Maintains >85% efficiency down to 10 mA load without external mode control logic |
| Internal soft-start | Controls output ramp rate to limit inrush current and prevent input rail droop during startup |
| Built-in thermal shutdown | 160°C junction protection with automatic recovery after cooldown-no latch-up or manual reset required |
| Low dropout at 100% duty cycle | Supports VOUT ≈ VIN – 0.2 V under light load, enabling near-100% duty-cycle operation for minimal dropout |
Applications
| Mobile Phone Power Rail | Digital Camera Core Supply |
|---|---|
Use Scenario: Regulating 3.3V or 2.5V from single-cell Li-ion (3.0–4.2V) to power baseband processor and RF transceiver. IC Role / Device Role / Timing Role: Primary buck regulator delivering clean, low-noise core voltage with fast transient response to burst-mode processing loads. Use Value: 1.5MHz switching minimizes inductor size (2.2μH) and avoids AM radio band interference; ±3% output accuracy ensures reliable digital logic operation. |
Use Scenario: Generating 1.2V or 1.8V for CMOS image sensor and ISP from shared 3.3V intermediate rail. IC Role / Device Role / Timing Role: Secondary point-of-load converter with tight output tolerance and low ripple (<20 mVpp) for analog pixel readout stability. Use Value: 600mV feedback reference enables precise low-voltage setting; thermal shutdown prevents damage during lens motor stall events. |
| MP3 Player Audio Codec Supply | Handheld Instrument LCD Bias |
Use Scenario: Providing 1.2V to stereo audio DAC/ADC in battery-operated portable media player. IC Role / Device Role / Timing Role: Low-quiescent-current (100 μA) buck converter maintaining efficiency during playback pause and standby states. Use Value: Automatic PWM-to-LDO transition sustains >90% efficiency at 10 mA load, extending battery life by >15% versus fixed-frequency-only alternatives. |
Use Scenario: Generating adjustable 2.8V–3.3V bias for TFT-LCD source driver ICs in industrial handheld test equipment. IC Role / Device Role / Timing Role: Programmable output buck converter supporting multiple display variants via resistor selection without board redesign. Use Value: 1V–3.3V adjustability covers common LCD VDD requirements; WDFN-2×2-6 package allows placement adjacent to display connector with minimal trace length. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 1.8V–6.5V input, 3MHz switching, 0.6V FB, 0.9mm × 1.3mm DSBGA package | Higher frequency enables smaller inductors but increases EMI sensitivity; lacks LDO mode | Preferred when board space is critical and input voltage exceeds 5.5V; not drop-in due to different pinout and control scheme |
| RT8059ZSP | 2.5V–5.5V input, 1.5MHz, 600mV FB, TSOT-23-5 package, no LDO mode | Same input/output specs but fixed PWM-only operation reduces light-load efficiency by ~8% at 10mA | Valid alternative if LDO mode is unnecessary and TSOT-23-5 footprint is preferred over WDFN-2×2-6 |
Compared with TPS62231DRYR and RT8059ZSP, the AUR9705AUGD uniquely combines 1.5MHz fixed-frequency operation with automatic PWM/LDO mode switching-delivering superior light-load efficiency and thermal resilience in space-constrained portable designs where input stays within 2.5–5.5V.
Availability
AUR9705AUGD is available at Aetrix Electronics and suitable for mobile phone power rails, digital camera core supplies, and MP3 player audio codec regulation requiring stable component supply, RoHS-compliant green packaging, and long-term production continuity.
Supply support for AUR9705AUGD 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
BCD Semiconductor Manufacturing Limited is a Shanghai-based fabless analog IC designer specializing in high-efficiency power management, LED drivers, and mixed-signal solutions for consumer and industrial markets.
The AUR9705 belongs to BCD's AUR series of synchronous buck converters-engineered specifically for portable electronics requiring compact size, wide input range, and adaptive efficiency modes across varying battery discharge profiles.
FAQ
What is the minimum recommended output capacitor for stable operation?
The datasheet specifies 10μF ceramic output capacitance with low ESR for stable loop performance and <20mVpp ripple at 1A load. Using less than 6.8μF risks instability under load transients, especially with high-ESR tantalum or aluminum electrolytic types. Layout must minimize trace inductance between COUT and GND pins.
Can AUR9705AUGD operate with input voltage below 2.5V?
No. The absolute minimum operating input voltage is 2.5V per Recommended Operating Conditions. Below this, UVLO remains active and the device will not start. At 2.4V input, EN may assert but internal regulators fail to bias correctly, resulting in undefined behavior or no output regulation.
How does the automatic PWM/LDO mode switching affect transient response?
In PWM mode, the device responds to load steps within 5–8 switching cycles (~3.3μs at 1.5MHz). During LDO mode (light load), response slows to ~20μs due to reduced gate drive strength-but output deviation remains <±2% because error amplifier bandwidth is preserved. This trade-off prioritizes quiescent current over speed at sub-10mA loads.
Is the exposed pad on the WDFN-2×2-6 package electrically connected?
Yes-the exposed pad is internally connected to GND and must be soldered to a dedicated PCB thermal pad tied to the main ground plane. Thermal resistance drops from 53°C/W (θJA) to ≤35°C/W when properly implemented, directly improving maximum sustainable output current at 85°C ambient.
AUR9705AUGD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-WDFN 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):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 3.3V
- Current - Output:
- 1A
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 80°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
AUR9705AUGD FAQ
1.How can I place an order for AUR9705AUGD through Aetrix?
Please submit a Request for Quotation (RFQ) for AUR9705AUGD 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 AUR9705AUGD reliable?
The price and inventory of AUR9705AUGD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AUR9705AUGD is usually 5 days.
3.What payment methods are accepted for AUR9705AUGD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AUR9705AUGD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AUR9705AUGD?
AUR9705AUGD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AUR9705AUGD 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 AUR9705AUGD?
For technical support, including AUR9705AUGD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AUR9705AUGD requirements.
6.How does Aetrix verify that AUR9705AUGD is sourced from the original manufacturer or authorized distributors?
All AUR9705AUGD 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 AUR9705AUGD meets industry standards.
7.What is the process for return or replacement of AUR9705AUGD?
All AUR9705AUGD units undergo pre-shipment inspection (PSI). If there is an issue with AUR9705AUGD, 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 AUR9705AUGD part is unused and in its original packaging.
Return procedure for AUR9705AUGD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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