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Diodes Incorporated AUR9703AGH
- Part No.:
- AUR9703AGH
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AUR9703AGH.pdf
- Description:
- IC REG BUCK ADJ 800MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,677
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Product details
Overview
AUR9703AGH from Diodes Incorporated is a synchronous step-down DC-DC converter IC delivering up to 800mA 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 compact portable power rails in handheld electronics.
For engineers reviewing the AUR9703AGH datasheet, AUR9703AGH pinout, AUR9703AGH application, or AUR9703AGH equivalent, key selection criteria include feedback reference voltage (600mV), thermal shutdown threshold (+160°C), soft-start time (200μs), EN logic thresholds (VEN_H ≥1.5V, VEN_L ≤0.6V), and TSOT-23-5 package thermal resistance (θJA = 118.31°C/W).
Technical Context
The AUR9703AGH employs peak-current-mode control with a built-in 1.5MHz oscillator and internal compensation, eliminating external timing capacitors. Its synchronous rectification uses integrated PMOS (RON ≈ 0.25Ω) and NMOS (RON ≈ 0.27Ω) switches, enabling >90% efficiency at mid-load across input voltages from 2.5V to 5.5V.
Automatic transition between PWM and LDO modes maintains high efficiency under light loads while supporting 100% duty-cycle operation for low-dropout regulation. The 600mV feedback reference enables precise output setting via resistor divider, and the 200μs soft-start prevents inrush current during startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 800mA maximum continuous - supports single-rail powering of baseband processors or RF modules |
| Switching Frequency | 1.5MHz (typ) - enables use of 2.2μH inductors and compact 4.7μF/10μF ceramic capacitors |
| Feedback Voltage | 600mV ±25mV - sets output via resistor divider; allows 1V–3.3V adjustment with <±3% accuracy |
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V), USB (5V), and dual-cell alkaline (3.0V) |
| Quiescent Current | 100μA (typ) at zero load - minimizes battery drain in standby mode of portable devices |
| Thermal Shutdown | +160°C - protects against sustained overload or poor PCB thermal design |
| Soft Start Time | 200μs - controls output ramp rate to prevent overshoot and reduce stress on output capacitor |
Pinout & Package
Package: TSOT-23-5 - ultra-small surface-mount package (2.8mm × 2.9mm × 1.1mm) with exposed pad for enhanced thermal performance in space-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable control input | Active-high logic signal; threshold VEN_H ≥1.5V, VEN_L ≤0.6V - enables direct MCU GPIO control without level shifting |
| 2 - GND | Power ground reference | Common return path for NMOS switch and internal bias circuits; must be low-impedance connection to system ground plane |
| 3 - LX | Switch node | Connects to inductor; carries high di/dt switching current - requires short, wide trace and separation from sensitive analog nodes (e.g., FB) |
| 4 - VIN | Main power input | Supplies internal circuitry and power switches; requires local 4.7μF ceramic capacitor placed adjacent to pin |
| 5 - FB | Feedback input | Monitors output voltage via resistive divider; high-impedance (30nA max) node - routed away from LX and noise sources |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Integrated PMOS/NMOS switches eliminate external Schottky diode - reduces BOM count and improves efficiency by ~8% vs. asynchronous designs |
| Auto PWM/LDO Mode Switching | Seamlessly transitions to 100% duty-cycle LDO mode below ~10mA load - maintains regulation while cutting quiescent current to 0.1μA |
| Built-in Soft Start | 200μs internal ramp - prevents output overshoot and limits inrush into output capacitance during power-up |
| Under-Voltage Lockout (UVLO) | 1.8V turn-on threshold with 0.1V hysteresis - ensures stable startup only when input rail is sufficiently established |
| Thermal Shutdown Protection | +160°C junction limit with hysteresis - disables switching until die cools, preventing permanent damage during sustained overload |
Applications
| Mobile Phone Power Rail | Digital Camera Core Supply |
|---|---|
Use Scenario: Regulating Li-ion battery (3.0–4.2V) to 1.2V for application processor core logic. IC Role / Device Role / Timing Role: Primary buck regulator providing tightly regulated, low-noise core voltage with fast transient response. Use Value: Delivers 800mA at >92% efficiency across load range; soft-start prevents reset glitches during boot. |
Use Scenario: Generating 2.5V from USB 5V input for image sensor and ISP processing block. IC Role / Device Role / Timing Role: Post-regulator stepping down intermediate rail to precision analog supply. Use Value: 600mV feedback reference enables accurate 2.5V output (±3%); 1.5MHz switching avoids interference with image capture timing. |
| MP3 Player Audio Codec Supply | Wireless Headset RF Front-End |
Use Scenario: Providing clean 1.8V supply to audio DAC/ADC in battery-powered MP3 player. IC Role / Device Role / Timing Role: Low-noise, high-PSRR DC-DC converter isolating analog audio section from digital switching noise. Use Value: TSOT-23-5 footprint saves board space; auto LDO mode extends battery life during playback pause. |
Use Scenario: Delivering 3.3V to Bluetooth radio IC from single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Efficient, compact voltage source meeting tight EMI requirements for 2.4GHz ISM band. Use Value: 1.5MHz fixed frequency simplifies EMI filtering; thermal shutdown protects during antenna mismatch events. |
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 |
|---|---|---|---|
| AP3428 | Same manufacturer, pin-compatible replacement; higher 2MHz switching frequency, lower IQ (30μA), improved light-load efficiency | Designed for newer portable platforms requiring faster transient response and longer battery life | Select AP3428 for new designs - Diodes explicitly states AUR9703 is "NOT RECOMMENDED FOR NEW DESIGN" |
| RT8059GJ6 | 6-pin WDFN package; 1.5MHz frequency; 1.2V fixed output (non-adjustable); no LDO mode; higher 1A output rating | Targeted at cost-sensitive, fixed-voltage applications where layout simplicity outweighs adjustability | Choose RT8059GJ6 only if fixed 1.2V output suffices and TSOT-23-5 footprint is not required |
Compared with AUR9703AGH, AP3428 offers superior efficiency and lower quiescent current in a drop-in package, while RT8059GJ6 trades adjustability and thermal protection for higher output current and fixed-voltage simplicity - making AP3428 the preferred upgrade path for most portable designs.
Availability
AUR9703AGH is available at Aetrix Electronics and suitable for mobile phone power rails, digital camera core supplies, and wireless headset RF front-end regulation requiring stable component supply, long-term lifecycle support, and RoHS/Green compliance.
Supply support for AUR9703AGH 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.
The AUR9703 belongs to Diodes' high-efficiency synchronous buck converter product line, designed specifically for space-constrained, battery-powered portable electronics requiring low quiescent current and wide-input flexibility.
FAQ
What is the recommended inductor value for AUR9703AGH?
The datasheet specifies 2.2μH as the standard inductor value across all output voltages (1.0V–3.3V), optimized for 40% peak-to-peak ripple current at full 800mA load. Inductor DC resistance should be minimized to preserve efficiency, and saturation current rating must exceed 1.2A to avoid core saturation under worst-case conditions.
Can AUR9703AGH operate with input voltage below 2.5V?
No - the absolute minimum recommended input voltage is 2.5V per the datasheet's Recommended Operating Conditions. Operation below this risks UVLO activation (1.8V threshold) and unstable regulation due to insufficient headroom for the internal LDO mode and synchronous switch conduction losses.
How does the automatic PWM/LDO mode switching work?
At light loads (<~10mA), the controller disables switching and enters 100% duty-cycle LDO mode using the NMOS switch as a pass element. This reduces quiescent current to 0.1μA while maintaining regulation. Load increase triggers seamless reversion to PWM mode with controlled soft-start ramp to prevent output disturbance.
Is AUR9703AGH RoHS compliant and halogen-free?
Yes - the "G" suffix in AUR9703AGH denotes RoHS-compliant and green (halogen-free) construction per Diodes Incorporated's ordering information table. The device meets JEDEC J-STD-020 moisture sensitivity level MSL3 and is qualified for reflow soldering per IPC/JEDEC J-STD-020 standards.
AUR9703AGH 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:
- 800mA
- 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
AUR9703AGH FAQ
1.How can I place an order for AUR9703AGH through Aetrix?
Please submit a Request for Quotation (RFQ) for AUR9703AGH 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 AUR9703AGH reliable?
The price and inventory of AUR9703AGH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AUR9703AGH is usually 5 days.
3.What payment methods are accepted for AUR9703AGH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AUR9703AGH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AUR9703AGH?
AUR9703AGH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AUR9703AGH 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 AUR9703AGH?
For technical support, including AUR9703AGH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AUR9703AGH requirements.
6.How does Aetrix verify that AUR9703AGH is sourced from the original manufacturer or authorized distributors?
All AUR9703AGH 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 AUR9703AGH meets industry standards.
7.What is the process for return or replacement of AUR9703AGH?
All AUR9703AGH units undergo pre-shipment inspection (PSI). If there is an issue with AUR9703AGH, 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 AUR9703AGH part is unused and in its original packaging.
Return procedure for AUR9703AGH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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