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Diodes Incorporated AP3409ADNTR-G1
- Part No.:
- AP3409ADNTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
AP3409ADNTR-G1.pdf
- Description:
- IC REG BUCK ADJ 3A UDFN303010
- Quantity:
- Payment:
- Shipping:
Inventory:4,041
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Product details
Overview
AP3409ADNTR-G1 from Diodes Incorporated is a current-mode PWM synchronous buck DC/DC converter with integrated P- and N-channel MOSFETs, delivering up to 3A output current at 0.8V–5V adjustable output voltage, 300kHz–4MHz programmable switching frequency, and 95% peak efficiency. It operates from a 2.6V–5.5V input, supports 100% duty cycle for Li-ion battery-powered portable media players and digital cameras.
For engineers reviewing the AP3409ADNTR-G1 datasheet, AP3409ADNTR-G1 pinout, AP3409ADNTR-G1 application, or AP3409ADNTR-G1 equivalent, key selection criteria include its U-DFN3030-10 package thermal performance (θJC = 3°C/W), ±2% reference voltage accuracy, PGOOD output monitoring, and built-in short-circuit/thermal shutdown protections.
Technical Context
The AP3409ADNTR-G1 implements fixed-frequency current-mode control with an internal 0.8V reference and error amplifier (transconductance = 800 µA/V). Its oscillator uses an external resistor on SHDN/RT to set frequency from 300kHz to 4MHz, enabling compact inductor and capacitor selection.
It integrates low-RDS(on) P-FET (0.11–0.16Ω) and N-FET (0.11–0.17Ω) switches, operates in forced continuous conduction mode, and includes soft-start (1.5ms), overcurrent limiting (3.5–4.2A), and thermal shutdown at +160°C with +20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6V to 5.5V - Supports single-cell Li-ion (2.7–4.2V) with headroom for full discharge and charging states. |
| Output Voltage Range | 0.8V to 5.0V - Adjustable via external resistor divider; 0.8V reference enables precise low-voltage core rail generation. |
| Max Output Current | 3A continuous - Sustained delivery under thermal limits (TJ ≤ +125°C) with proper PCB copper and airflow. |
| Switching Frequency | 300kHz to 4MHz - Programmable via RT resistor; higher frequencies reduce passive size but increase switching loss. |
| Efficiency (Peak) | Up to 95% - Achieved at mid-load (e.g., 1.5A, VOUT=2.5V, VIN=3.3V), minimizing power loss in space-constrained designs. |
| Reference Voltage Accuracy | ±2% (0.784V to 0.816V) - Ensures tight output regulation across temperature and line/load variations. |
| Thermal Shutdown Threshold | +160°C with +20°C hysteresis - Prevents permanent damage during sustained overload or poor heatsinking. |
Pinout & Package
AP3409ADNTR-G1 is housed in a thermally enhanced U-DFN3030-10 (DN) package with 3.0mm × 3.0mm footprint and 0.7mm height. The exposed pad is internally connected to PGND for optimal thermal dissipation and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: SHDN/RT | Oscillator frequency setting / shutdown control | Resistor-to-GND sets fSW; pulled to VDD disables converter with <1µA quiescent current. |
| 2: GND | Signal ground reference | Reference for FB, COMP, and internal logic; must be star-connected to PGND at one point to avoid noise coupling. |
| 3,4: SW | Switch node | Drives external inductor; carries high di/dt; requires short, low-inductance routing to minimize ringing and EMI. |
| 5: PGND | Power ground return | Primary return path for high-current switch loop; connects directly to CIN/COUT ground pads and exposed thermal pad. |
| 6,7: PVDD | Power input supply | High-current VIN input; decoupled to PGND with ≥22µF ceramic capacitor placed adjacent to pins 6/7. |
| 8: PGOOD | Power-good status indicator | Open-drain output pulled low when VOUT deviates >±12.5% from target; used for system sequencing and fault reporting. |
| 9: FB | Feedback voltage sensing | Inverting input of error amplifier; senses output via resistor divider; 0.8V threshold defines VOUT = 0.8V × (1 + R1/R2). |
| 10: COMP | Compensation network connection | Error amplifier output; connects external RC network (e.g., 30kΩ + 1000pF) to stabilize loop response and prevent oscillation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P/N-FET Power Stage | RDS(on) ≤ 0.16Ω (P-FET) and ≤ 0.17Ω (N-FET) reduces conduction loss and eliminates external MOSFET layout complexity. |
| PGOOD Output Monitoring | Dedicated open-drain flag confirms regulated output within ±12.5%, enabling reliable power sequencing in multi-rail systems. |
| Programmable Switching Frequency | 300kHz–4MHz range allows trade-off between inductor size (smaller at high fSW) and efficiency (higher at mid-fSW). |
| Built-in Soft-Start | 1.5ms internal ramp prevents inrush current and output overshoot during startup, eliminating need for external timing components. |
| Robust Protection Suite | Includes cycle-by-cycle current limit, thermal shutdown (+160°C), short-circuit protection, and UVLO (2.2V threshold). |
Applications
| Portable Media Player | Digital Still Camera |
|---|---|
|
Use Scenario: Powering SoC core voltage (1.0–1.2V) and image sensor I/O rails (2.8–3.3V) from a single Li-ion cell. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing stable, low-noise DC output with fast transient response to burst-mode sensor activity. Use Value: 100% duty cycle extends runtime at end-of-discharge; 95% efficiency minimizes heat in sealed enclosures. |
Use Scenario: Supplying CMOS image sensor analog and digital domains during high-speed capture sequences. IC Role / Device Role / Timing Role: High-current, low-ripple power source synchronized to exposure timing; PGOOD ensures clean power before frame readout. Use Value: Fast load transient recovery (<4ms) maintains sensor bias stability; ±2% VREF ensures consistent ADC reference accuracy. |
| Notebook Subsystem Rail | USB-Powered Peripheral |
|
Use Scenario: Generating 1.8V or 3.3V auxiliary rails for SSD controllers, audio codecs, or display interface ICs. IC Role / Device Role / Timing Role: Secondary buck converter in multi-phase notebook power architecture, controlled via SHDN/RT for dynamic rail enable/disable. Use Value: U-DFN3030-10 package fits tight board spaces; 3A capability supports burst-mode storage access without voltage droop. |
Use Scenario: Regulating 5V USB input down to 3.3V or 2.5V for embedded microcontrollers and sensors in portable accessories. IC Role / Device Role / Timing Role: Input-stage DC/DC converter accepting wide USB voltage tolerance (4.4–5.25V) and delivering regulated output with PGOOD handshake. Use Value: 2.6V minimum VIN enables operation during USB port brownout; built-in thermal protection prevents failure in unventilated housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z (Monolithic Power) | Fixed 2MHz fSW, no PGOOD, 2A max output, wider 4.5–36V VIN range | Suited for industrial 12V/24V inputs; lacks PGOOD and 100% duty cycle needed for Li-ion end-of-discharge. | Select if input is >5.5V and PGOOD is not required; verify thermal margin at 3A with external FETs. |
| TPS62231DRYT (Texas Instruments) | 3MHz fSW, 0.6V reference, 0.8A max output, no PGOOD, smaller 2mm × 2mm DSBGA | Targeted at ultra-low-power MCU cores; insufficient current for camera sensors or media SoCs. | Choose only for sub-1A loads where board area is critical; cannot replace AP3409ADNTR-G1 in 3A applications. |
Compared with MP2451DT-LF-Z and TPS62231DRYT, AP3409ADNTR-G1 uniquely combines 3A capability, 100% duty cycle, PGOOD, and Li-ion-optimized 2.6V–5.5V input-making it irreplaceable in portable 3A buck applications requiring full battery utilization and system-level fault signaling.
Availability
AP3409ADNTR-G1 is available at Aetrix Electronics and suitable for portable media players, digital still/video cameras, and notebook subsystem rails requiring stable component supply, RoHS/Green compliance, and long-term design-in support despite its obsolete status.
Supply support for AP3409ADNTR-G1 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 ICs, with leadership in power management, signal integrity, and protection solutions.
The AP3409/A series belongs to Diodes' high-efficiency synchronous buck converter product line, designed specifically for space- and battery-constrained portable electronics requiring high current density, wide input range, and robust protection.
FAQ
What is the function of the SHDN/RT pin on AP3409ADNTR-G1?
The SHDN/RT pin serves dual functions: connecting an external resistor to GND sets the switching frequency (300kHz–4MHz), while pulling the pin to VDD disables the device with <1µA shutdown current. This dual-role pin eliminates the need for separate frequency-setting and enable pins, reducing BOM count and PCB area in compact designs.
How does the PGOOD pin operate, and what is its voltage threshold?
The PGOOD pin is an open-drain output that pulls low when the regulated output voltage deviates beyond ±12.5% of the target value. It remains high-impedance otherwise, requiring an external pull-up resistor. This flag enables safe power sequencing and system-level fault detection without additional monitoring circuitry.
Can AP3409ADNTR-G1 operate with input voltage below 2.6V?
No-2.6V is the absolute minimum specified input voltage per datasheet. Operation below this risks UVLO activation (2.2V threshold) and unstable regulation. At end-of-discharge for a Li-ion cell (~2.7V), the 100% duty cycle feature maintains output, but sub-2.6V operation is outside guaranteed specifications and may cause dropout or reset.
What thermal considerations apply to the U-DFN3030-10 package?
The U-DFN3030-10 package has θJC = 3°C/W and θJA = 110°C/W. To sustain 3A continuously, the exposed PGND pad must be soldered to ≥100mm² of 2oz copper with ≥4 thermal vias to inner ground planes. Ambient temperature must stay ≤+85°C with adequate airflow to keep junction temperature below +125°C.
AP3409ADNTR-G1 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):
- 2.6V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 3A
- Frequency - Switching:
- 300kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-DFN3030-10
AP3409ADNTR-G1 FAQ
1.How can I place an order for AP3409ADNTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3409ADNTR-G1 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 AP3409ADNTR-G1 reliable?
The price and inventory of AP3409ADNTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3409ADNTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3409ADNTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3409ADNTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3409ADNTR-G1?
AP3409ADNTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3409ADNTR-G1 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 AP3409ADNTR-G1?
For technical support, including AP3409ADNTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3409ADNTR-G1 requirements.
6.How does Aetrix verify that AP3409ADNTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3409ADNTR-G1 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 AP3409ADNTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3409ADNTR-G1?
All AP3409ADNTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3409ADNTR-G1, 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 AP3409ADNTR-G1 part is unused and in its original packaging.
Return procedure for AP3409ADNTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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