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Diodes Incorporated AP3409DNTR-G1
- Part No.:
- AP3409DNTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
AP3409DNTR-G1.pdf
- Description:
- IC REG BUCK ADJ 3A UDFN303010
- Quantity:
- Payment:
- Shipping:
Inventory:3,419
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Product details
Overview
AP3409DNTR-G1 from Diodes Incorporated is a current-mode PWM synchronous buck DC/DC converter with integrated P-channel and N-channel MOSFETs, delivering up to 3A output current at 95% peak efficiency. It operates from 2.6V–5.5V input, supports adjustable 0.8V–5V output via resistor divider, and features programmable 300kHz–4MHz switching frequency for compact inductor/capacitor selection. Designed for single-cell Li-ion portable systems, it enables 100% duty cycle operation to extend battery runtime.
For engineers reviewing the AP3409DNTR-G1 datasheet, AP3409DNTR-G1 pinout, AP3409DNTR-G1 application, or AP3409DNTR-G1 equivalent, key selection considerations include its U-DFN3030-10 package thermal performance (θJC = 3°C/W), ±2% reference voltage accuracy, built-in soft-start and thermal shutdown, and differential PGOOD monitoring (AP3409A variant only).
Technical Context
The AP3409DNTR-G1 implements fixed-frequency current-mode control with internal error amplifier (transconductance = 800 µA/V, gain = 800 V/V) and oscillator synchronized via external RT resistor. Its dual-MOSFET power stage uses low-RDS(on) P-FET (typ. 110 mΩ) and N-FET (typ. 110 mΩ) switches optimized for high-side and low-side conduction in continuous conduction mode (CCM).
Functional safety features include overcurrent protection (3.2–4.2 A limit), thermal shutdown at +160°C with +20°C hysteresis, and under-voltage lockout (2.2 V threshold, 300 mV hysteresis). The COMP pin provides direct access to the error amplifier output for loop compensation using external R/C networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6 V to 5.5 V - Supports full discharge range of single Li-ion cell (2.7 V–4.2 V) plus margin for system transients. |
| Output Current | 3 A continuous - Sustains full load without derating at +85°C ambient with proper PCB copper area. |
| Reference Voltage | 0.8 V ±2% - Enables precise output regulation (e.g., 2.5 V ±25 mV) using standard 1% feedback resistors. |
| Switching Frequency | 300 kHz to 4 MHz - Selectable via RT resistor; 1 MHz typical allows ≤2.2 µH inductors and <22 µF ceramic output capacitance. |
| Efficiency | Up to 95% - Achieved at 3.3 VIN/2.5 VOUT/1 A due to low RDS(on) FETs and synchronous rectification. |
| Thermal Resistance | θJA = 110 °C/W, θJC = 3 °C/W - Exposed pad tied to PGND enables efficient heat transfer to inner ground plane. |
| Duty Cycle Range | 0% to 100% - Enables dropout operation down to VOUT – 0.1 V, critical for battery end-of-life support. |
Pinout & Package
AP3409DNTR-G1 is housed in a 3.0 mm × 3.0 mm × 0.55 mm U-DFN3030-10 package with exposed thermal pad connected to PGND. The 10-pin layout supports high-current paths (SW, PVDD, PGND) and precision analog signals (FB, COMP, SHDN/RT) with dedicated GND and VDD pins for noise isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SHDN/RT | Oscillator frequency setting (via RT resistor to GND) and shutdown control (pull ≥VDD–0.4 V to disable). |
| 2 | GND | Signal ground reference for FB, COMP, and internal analog circuitry; connects to exposed pad at single point. |
| 3, 4 | SW | Drain node of internal P-FET and source node of N-FET; connects directly to inductor high-side terminal. |
| 5 | PGND | Power ground return for input/output capacitors and FET sources; must be low-inductance connection to exposed pad. |
| 6, 7 | PVDD | Main power input for high-side driver and power FETs; requires local 10 µF ceramic decoupling to PGND. |
| 8 | VDD | Logic supply for control circuitry; decoupled to GND with 1 µF ceramic; derived from PVDD via internal LDO. |
| 9 | FB | Inverting input of error amplifier; senses output voltage via resistor divider; 0.8 V reference sets VOUT = 0.8×(1+R1/R2). |
| 10 | COMP | Error amplifier output; connects to Type-II/III compensation network (RC + C) to stabilize voltage loop. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | P-channel (110 mΩ typ.) and N-channel (110 mΩ typ.) MOSFETs eliminate external switch losses and reduce BOM count. |
| Programmable Switching Frequency | 300 kHz–4 MHz via single RT resistor enables optimization of size vs. EMI vs. light-load efficiency trade-offs. |
| 100% Duty Cycle Operation | Enables VOUT regulation down to VIN – 0.1 V, extending usable battery life by >15% in Li-ion applications. |
| Built-in Protection Functions | Current limiting (4.2 A max), thermal shutdown (+160°C), UVLO (2.2 V), and short-circuit recovery prevent field failures. |
| Lead-Free & Green Compliance | RoHS 2 compliant (2011/65/EU), halogen-free (<900 ppm Br/Cl, <1000 ppm Sb), and fully lead-free construction. |
Applications
| Portable Media Player | Digital Still Camera |
|---|---|
|
Use Scenario: Powering image signal processor (ISP), memory interface, and display backlight from single Li-ion cell. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 1.2 V/3 A to SoC core and 2.8 V/1.5 A to sensor interface. Use Value: 100% duty cycle maintains regulation until battery drops to 2.7 V, enabling 12% longer playback time versus non-100% solutions. |
Use Scenario: Supplying CMOS image sensor, autofocus motor driver, and SD card interface in compact camera modules. IC Role / Device Role / Timing Role: High-efficiency buck converter generating 1.8 V/2 A for sensor logic and 3.3 V/1 A for I/O rails. Use Value: 4 MHz switching allows use of 1.0 µH inductors and 10 µF total output capacitance, reducing board area by 35%. |
| Notebook Subsystem | Wireless Headset Audio Codec |
|
Use Scenario: Providing auxiliary 1.5 V/2 A rail for USB-C PD controller, touchpad MCU, and LED indicators in ultrabooks. IC Role / Device Role / Timing Role: Secondary buck regulator operating in forced CCM to ensure low-noise, ripple-free supply for sensitive analog circuits. Use Value: ±2% reference voltage and 0.4%/V line regulation minimize voltage drift across 2.6–5.5 V input range, ensuring consistent peripheral operation. |
Use Scenario: Powering stereo audio codec, Bluetooth baseband IC, and MEMS microphone bias in true wireless stereo earbuds. IC Role / Device Role / Timing Role: Compact, low-quiescent-current buck converter delivering 1.2 V/1.2 A with fast transient response to handle burst-mode RF transmission. Use Value: 95% peak efficiency at 1 A reduces thermal load in sealed enclosure, enabling 20% higher battery capacity utilization. |
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 2 MHz frequency; no RT programming; 2.5 A max output; 0.8 V ref ±1.5%; no 100% duty cycle. | Lacks battery-end-of-life support; requires larger input capacitor for same ripple due to fixed frequency. | Select when board space is constrained and 2.5 A output suffices; avoid for Li-ion systems requiring deep discharge support. |
| TPS62231DRYR (Texas Instruments) | 3 MHz fixed frequency; 0.6 V ref ±1%; 0.95 A max; integrated compensation; no PGOOD or thermal shutdown. | Not suitable for >1 A loads; lacks fault reporting and overtemperature protection required in consumer devices. | Choose only for low-power always-on subsystems where cost and footprint outweigh protection needs. |
Compared with MP2451DT-LF-Z and TPS62231DRYR, AP3409DNTR-G1 uniquely combines 3 A capability, 100% duty cycle, programmable frequency, and comprehensive protection-making it the only viable option for high-current portable Li-ion applications demanding full battery utilization and robust field reliability.
Availability
AP3409DNTR-G1 is available at Aetrix Electronics and suitable for portable media players, digital cameras, notebook subsystems, and wireless audio devices requiring stable component supply throughout product lifecycles.
Supply support for AP3409DNTR-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 manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection solutions for high-volume consumer and industrial markets.
The AP3409 series belongs to Diodes' high-efficiency DC/DC converter product line, engineered specifically for space-constrained, battery-powered portable electronics requiring wide-input-range operation and extended runtime.
FAQ
What is the maximum output current capability of AP3409DNTR-G1 under real-world PCB conditions?
The AP3409DNTR-G1 delivers 3 A continuously when mounted on a 4-layer PCB with ≥2 oz copper on inner layers, 300 mm² exposed PGND pad area, and ambient temperature ≤+65°C. At +85°C ambient, output current derates to 2.4 A due to thermal limits, verified per JEDEC JESD51-2 standards with 100% duty cycle enabled.
How does the SHDN/RT pin function in both shutdown control and frequency programming modes?
The SHDN/RT pin serves dual roles: connecting an RT resistor to GND sets switching frequency (fOSC ≈ 1/(1.2×RRT)), while pulling the pin above VDD–0.4 V forces shutdown with <1 µA quiescent current. No external pull-up is needed-the internal circuitry detects voltage level relative to VDD, enabling simple microcontroller GPIO control.
Can AP3409DNTR-G1 be used in designs requiring output voltages below 0.8 V?
No-AP3409DNTR-G1 has a fixed 0.8 V internal reference with ±2% tolerance; output voltage is calculated as VOUT = 0.8 V × (1 + R1/R2). Attempting sub-0.8 V operation violates the FB pin's valid sensing range and causes regulation failure. For lower outputs, select a part with adjustable reference or external reference support.
What is the recommended PCB layout practice for the exposed thermal pad on U-DFN3030-10?
The exposed pad must be soldered to a solid PGND copper pour with ≥6 thermal vias (0.3 mm diameter, spaced ≤1 mm apart) connecting to inner ground planes. Pad dimensions match the package outline (2.3 mm × 2.5 mm), and stencil aperture should be 100% open with 5–8 µm nickel-gold finish to ensure void-free solder joint and θJC ≤3°C/W performance.
AP3409DNTR-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
AP3409DNTR-G1 FAQ
1.How can I place an order for AP3409DNTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3409DNTR-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 AP3409DNTR-G1 reliable?
The price and inventory of AP3409DNTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3409DNTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3409DNTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3409DNTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3409DNTR-G1?
AP3409DNTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3409DNTR-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 AP3409DNTR-G1?
For technical support, including AP3409DNTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3409DNTR-G1 requirements.
6.How does Aetrix verify that AP3409DNTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3409DNTR-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 AP3409DNTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3409DNTR-G1?
All AP3409DNTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3409DNTR-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 AP3409DNTR-G1 part is unused and in its original packaging.
Return procedure for AP3409DNTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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