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Diodes Incorporated AUR9705AGH
- Part No.:
- AUR9705AGH
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AUR9705AGH.pdf
- Description:
- IC REG BUCK ADJ 1A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,695
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Product details
Overview
AUR9705AGH from Diodes Incorporated is a synchronous step-down DC-DC converter delivering up to 1A output current with adjustable output voltage (1V–3.3V), 1.5MHz fixed switching frequency, and integrated PMOS/NMOS power switches. It operates across 2.5V–5.5V input range, features automatic PWM/LDO mode switching, and targets portable power rails in handheld electronics requiring compact, high-efficiency regulation.
For engineers reviewing the AUR9705AGH datasheet, AUR9705AGH pinout, AUR9705AGH application, or AUR9705AGH equivalent, key selection criteria include feedback voltage (600mV), thermal shutdown threshold (+160°C), quiescent current (100μA), and dual-package availability (TSOT-23-5/WDFN-2×2-6) for layout-constrained designs.
Technical Context
The AUR9705AGH implements constant-frequency peak-current-mode control with internal oscillator (1.2–1.8MHz typical), built-in error amplifier, soft-start circuitry, and thermal shutdown detection. Its architecture integrates synchronous rectification drivers and internal compensation to eliminate external loop components.
It supports automatic transition between PWM and LDO modes based on load conditions, enabling high efficiency across light-to-heavy loads. The 600mV feedback reference enables precise output setting via external resistor divider, while UVLO (1.8V rising, 0.1V hysteresis) ensures reliable startup under marginal input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1A maximum continuous - supports single-rail powering of core logic or RF subsystems in portable devices. |
| Switching Frequency | 1.5MHz nominal - enables use of 2.2μH inductors and 10μF ceramic output capacitors for space-constrained PCB layouts. |
| Feedback Voltage | 600mV ±15mV - sets output accuracy to ±3% over line/load/temperature; allows flexible VOUT configuration from 1.0V to 3.3V. |
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V), USB-powered (5V), and multi-cell alkaline inputs. |
| Quiescent Current | 100μA typical at zero load - minimizes standby power loss in battery-operated systems with intermittent operation. |
| Thermal Shutdown | +160°C junction temperature - protects device during overload or poor thermal design without requiring external sensing. |
| UVLO Threshold | 1.8V rising with 0.1V hysteresis - prevents erratic startup during brown-out and ensures clean power-up sequencing. |
Pinout & Package
Package: TSOT-23-5 - ultra-small surface-mount package (2.8mm × 2.9mm × 1.1mm), thermally enhanced with exposed pad option in WDFN variant; this part (AUR9705AGH) uses TSOT-23-5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Power input supply | Accepts 2.5–5.5V; connects to input capacitor bank; must be decoupled near IC for stable switching. |
| 2 GND | Power ground reference | Low-impedance return path for NMOS switch and internal bias circuits; requires solid copper pour connection. |
| 3 EN | Enable control input | Active-high logic signal (1.5V min high, 0.6V max low); controls full device shutdown with <1μA off-state current. |
| 4 LX | Switch node | Drives external inductor; carries high di/dt square wave; requires short, low-inductance trace to minimize EMI and ringing. |
| 5 FB | Feedback input | Monitors output voltage via resistive divider; 30nA input bias enables high-value resistor selection (e.g., 100kΩ/68kΩ). |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated PMOS/NMOS power switches (RON_P ≈ 0.25Ω, RON_N ≈ 0.27Ω) eliminate external Schottky diode and reduce conduction loss. |
| Automatic PWM/LDO mode | Seamlessly transitions to 100% duty-cycle LDO operation under light load, maintaining regulation without pulse-skipping artifacts. |
| Internal compensation | Eliminates need for external Type-II/III compensation network - simplifies BOM and reduces layout sensitivity. |
| Soft-start | Internally controlled ramp limits inrush current during power-up, preventing input rail collapse and output overshoot. |
| Thermal & UVLO protection | Dual fault safeguards ensure robust operation: UVLO prevents startup below 1.8V; TSD disables switching above +160°C junction. |
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 I/O or camera sensor interface. IC Role / Device Role / Timing Role: Primary buck regulator providing stable, low-noise core voltage with fast transient response to burst-mode processing loads. Use Value: 1.5MHz operation enables small 2.2μH inductor and 10μF ceramic capacitor, reducing solution footprint by >40% vs. lower-frequency alternatives. |
Use Scenario: Generating 1.8V or 1.2V for image signal processor (ISP) core from shared 3.3V system rail. IC Role / Device Role / Timing Role: Secondary point-of-load converter with adjustable output, supporting dynamic voltage scaling during capture vs. standby modes. Use Value: Automatic PWM/LDO mode maintains >85% efficiency down to 10mA load, extending battery life during preview and idle states. |
| MP3 Player Audio Codec Supply | Wireless Headset RF Front-End |
|
Use Scenario: Delivering clean 1.2V to audio DAC/ADC in portable music players powered by two alkaline cells (2.4–3.2V). IC Role / Device Role / Timing Role: Low-noise, high-PSRR buck converter operating in continuous conduction mode to minimize switching ripple in analog audio paths. Use Value: 600mV feedback reference and tight ±3% output accuracy ensure consistent codec performance across battery discharge curve. |
Use Scenario: Providing 3.3V to Bluetooth radio transceiver in compact earbud PCB where board area is limited to <100mm². IC Role / Device Role / Timing Role: Compact, thermally efficient step-down regulator in TSOT-23-5 package, directly mounted adjacent to RF IC. Use Value: Integrated MOSFETs and 1.5MHz switching allow full 1A capability in 2.8mm × 2.9mm footprint - no external FETs or driver required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP63202WU-7 | 2A rated, 2.2MHz switching, 0.6V FB, but requires external compensation and lacks automatic LDO mode. | Better suited for higher-current, higher-frequency designs where layout space permits larger inductor and compensation components. | Select when >1A output or tighter ripple specs demand higher switching frequency and external loop tuning. |
| TPS62231DRVR | 1A, 3MHz, 0.6V FB, integrated soft-start, but no thermal shutdown and only 2.05V–6.5V input range. | Optimized for ultra-thin devices needing minimal output capacitance; lacks thermal protection for sustained high-ambient operation. | Prefer when board-level thermal management is assured and 3MHz enables sub-1μH inductor use. |
Compared with AP63202WU-7 and TPS62231DRVR, the AUR9705AGH uniquely combines integrated compensation, automatic PWM/LDO mode, and thermal shutdown in a TSOT-23-5 package - making it optimal for cost-sensitive, space-constrained, and thermally variable handheld applications.
Availability
AUR9705AGH is available at Aetrix Electronics and suitable for mobile phone power rails, digital camera core supplies, MP3 player audio codec regulation, and wireless headset RF front-end powering requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AUR9705AGH 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 for consumer, industrial, and computing markets.
The AUR9705 belongs to Diodes' high-efficiency synchronous buck converter product line, designed specifically for portable electronics requiring compact, low-quiescent-current DC-DC regulation with minimal external components.
FAQ
What is the recommended inductor value for AUR9705AGH in a 3.3V output application?
For 3.3V output with 5V input, Diodes recommends a 2.2μH shielded power inductor with ≥1.5A saturation current and low DCR (<100mΩ). This value balances ripple current (~40% of 1A), efficiency, and physical size - validated in the datasheet's Typical Applications Circuit and Component Guide Table 1.
Does AUR9705AGH require an external compensation network?
No. The AUR9705AGH integrates full Type-II compensation circuitry, eliminating external compensation components. This is confirmed in the Functional Block Diagram and Application Information section, which states "internal compensators to reduce external part counts" and provides stable operation with only CIN, COUT, L, and feedback resistors.
How does the automatic PWM/LDO mode switching improve system efficiency?
Under light load (e.g., <10mA), the AUR9705AGH transitions from PWM to 100% duty-cycle LDO mode, eliminating switching losses and reducing quiescent current to ~0.1μA. This extends battery runtime in standby without compromising regulation - verified in Efficiency vs. Output Current plots across VOUT=1.2V/2.5V/3.3V.
Can AUR9705AGH operate with input voltage below 2.5V?
No. The Absolute Maximum Ratings and Recommended Operating Conditions specify 2.5V minimum input voltage. Operation below 2.5V violates specification and may cause UVLO activation or unstable regulation. The UVLO rising threshold is 1.8V, but functional operation begins only at ≥2.5V per datasheet Section 5.
AUR9705AGH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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:
- TSOT-23-5
AUR9705AGH FAQ
1.How can I place an order for AUR9705AGH through Aetrix?
Please submit a Request for Quotation (RFQ) for AUR9705AGH 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 AUR9705AGH reliable?
The price and inventory of AUR9705AGH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AUR9705AGH is usually 5 days.
3.What payment methods are accepted for AUR9705AGH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AUR9705AGH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AUR9705AGH?
AUR9705AGH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AUR9705AGH 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 AUR9705AGH?
For technical support, including AUR9705AGH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AUR9705AGH requirements.
6.How does Aetrix verify that AUR9705AGH is sourced from the original manufacturer or authorized distributors?
All AUR9705AGH 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 AUR9705AGH meets industry standards.
7.What is the process for return or replacement of AUR9705AGH?
All AUR9705AGH units undergo pre-shipment inspection (PSI). If there is an issue with AUR9705AGH, 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 AUR9705AGH part is unused and in its original packaging.
Return procedure for AUR9705AGH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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