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Diodes Incorporated AP3440FNTR-G1
- Part No.:
- AP3440FNTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- 16-UFQFN Exposed Pad
- Datasheet:
-
AP3440FNTR-G1.pdf
- Description:
- IC REG BUCK ADJ 4A 16UQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,476
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Product details
Overview
AP3440FNTR-G1 from Diodes Incorporated is a current-mode PWM synchronous buck DC-DC converter delivering 4A output at up to 94% efficiency, with integrated 30mΩ high-side and low-side N-channel MOSFETs, programmable 200kHz–2MHz switching frequency, and 0.803V ±3% reference voltage. It serves as a point-of-load regulator for FPGAs, ASICs, and microprocessors in space-constrained, high-density power systems.
For engineers reviewing the AP3440FNTR-G1 datasheet, AP3440FNTR-G1 pinout, AP3440FNTR-G1 application, or AP3440FNTR-G1 equivalent, key selection criteria include input voltage range (2.95–5.5V), soft-start programmability, external clock synchronization capability, and built-in over-current, over-voltage, UVLO, and thermal shutdown protections.
Technical Context
The AP3440FNTR-G1 employs peak current-mode control with slope compensation, enabling fast transient response and inherent cycle-by-cycle current limiting. Its error amplifier drives a PWM comparator referenced to a precision 0.803V bandgap, with COMP pin providing access to loop compensation network design.
Switching frequency is set either by an external resistor on RT/CLK (200–2000 kHz) or synchronized to an external clock (300–2000 kHz) with 75ns minimum pulse width; SW pin timing is aligned to the falling edge of the external clock. The device operates exclusively in continuous conduction mode (CCM) and supports pre-biased soft-start.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.95V to 5.5V - supports single-cell Li-ion, USB PD, and 3.3V/5V rail inputs without external LDO pre-regulation. |
| Output Current | 4A continuous - delivers full-rated load with thermal derating only above +85°C ambient. |
| Reference Voltage | 0.803V ±3% - enables accurate 1.8V, 1.2V, or 0.85V outputs using standard 1% feedback resistors. |
| Switching Frequency | 200kHz–2MHz - higher frequencies allow smaller inductors (e.g., 1.5µH at 500kHz) and reduce solution footprint. |
| MOSFET RDS(on) | 30mΩ (typ) high-side & low-side - minimizes conduction loss at 4A, supporting >90% efficiency at 1.8V/4A output. |
| Power Good Threshold | 93–107% of VREF - provides reliable system power sequencing and fault detection with 2% hysteresis. |
| Soft-Start Current | 2µA (typ) - sets controlled VOUT ramp time via external capacitor; supports tracking and pre-biased startup. |
Pinout & Package
The AP3440FNTR-G1 is housed in a thermally enhanced U-QFN3030-16 package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad (EP) for PCB-level heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,2,16) | Input power supply | Accepts 2.95–5.5V; requires local ceramic decoupling (≥4.7µF) placed adjacent to pins for stable high-frequency operation. |
| GND (Pins 3,4) | Power ground return | Must be connected directly to PCB power plane and EP; forms low-impedance path for high di/dt switch currents. |
| AGND (Pin 5) | Analog ground reference | Requires star-point connection to GND near IC to isolate noise-sensitive feedback and compensation paths. |
| FB (Pin 6) | Feedback sensing node | Connects to resistor divider from VOUT; 0.803V reference enables precise output regulation with <±1% total error. |
| COMP (Pin 7) | Error amplifier output | Interface for Type II/III compensation network; stability depends on external RC components tied to this pin. |
| RT/CLK (Pin 8) | Frequency programming / sync input | Configures switching frequency via resistor (200–2000kHz) or accepts external clock (300–2000kHz) with defined logic thresholds. |
| SS (Pin 9) | Soft-start control | Charged by internal 2µA current source; external capacitor determines monotonic VOUT ramp time and enables tracking. |
| SW (Pins 10,11,12) | Switch node | Drives external inductor; carries high di/dt square wave; must be routed short and wide to minimize EMI and ringing. |
| BOOT (Pin 13) | High-side gate drive supply | Requires 0.1µF X5R/X7R ceramic between BOOT and SW to sustain gate voltage during high-side conduction. |
| PGD (Pin 14) | Open-drain power-good indicator | Asserts low when VFB falls below 91% or exceeds 107% of reference; requires external pull-up (1kΩ–100kΩ). |
| EN (Pin 15) | Enable / UVLO adjustment | Internal 1.25V threshold; floating = enabled; pulled <1.18V = disabled; external resistor divider raises UVLO above 2.6V. |
| EP | Exposed thermal pad | Must be soldered to solid GND copper area with ≥4 thermal vias (0.3mm diameter) for optimal junction-to-board thermal resistance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual N-MOSFETs | 30mΩ (typ) RDS(on) each - eliminates external power stage, reduces BOM count, and improves layout simplicity. |
| Programmable soft-start | Adjustable ramp time via SS pin capacitor - prevents inrush current, enables power sequencing, and supports pre-biased outputs. |
| External clock synchronization | Falling-edge-aligned SW timing to RT/CLK input - eliminates beat frequencies in multi-rail systems and simplifies EMI filtering. |
| Built-in protection suite | Over-current (hiccup mode), over-voltage, under-voltage lockout (adjustable), and thermal shutdown (140°C trip, 120°C recovery) - ensures robust field reliability without external circuitry. |
| Thermally optimized package | U-QFN3030-16 with exposed pad - achieves θJA = 70°C/W, enabling 4A operation in compact 3mm × 3mm footprint at +85°C ambient. |
Applications
| High-Performance FPGA Power | ASIC Point-of-Load Regulation |
|---|---|
|
Use Scenario: Powering Xilinx Artix-7 or Intel Cyclone V FPGA core rails (1.0V/1.2V) in telecom line cards with strict size constraints. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 4A at 1.2V with tight transient response to handle dynamic logic switching. Use Value: Integrated MOSFETs and 2MHz capability enable <100mm² total solution size; soft-start prevents configuration corruption during cold boot. |
Use Scenario: Supplying 1.8V/3A to ASIC I/O banks in optical transceiver modules where thermal density exceeds 15W/cm². IC Role / Device Role / Timing Role: High-efficiency step-down converter operating in CCM with precise 0.803V reference for stable I/O voltage margining. Use Value: 94% peak efficiency reduces heat generation; PGD signal validates rail integrity before laser driver activation. |
| Microprocessor Core Supply | Broadband Networking SoC |
|
Use Scenario: Generating 0.85V/4A for ARM Cortex-A72 cores in industrial gateway SoCs requiring low-noise, tightly regulated supplies. IC Role / Device Role / Timing Role: Core voltage regulator with adjustable UVLO and external clock sync to align switching with SoC clock domain. Use Value: 30mΩ MOSFETs and current-mode control deliver <15mV load transient deviation; EN pin allows coordinated power-up with PMIC sequencer. |
Use Scenario: Powering Broadcom BCM58712 packet processor in 10Gbps Ethernet switches with multiple independent voltage rails. IC Role / Device Role / Timing Role: Secondary buck converter synchronized to system master clock to suppress conducted EMI across shared PCB planes. Use Value: RT/CLK synchronization eliminates sub-harmonic interference in ADC/DAC sections; thermal shutdown protects against airflow failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | Fixed 500kHz frequency, no external clock sync, 3.5A rated, 0.8V reference, same 3×3 QFN-16 package | Lacks programmable soft-start and adjustable UVLO; limited to fixed-frequency designs without EMI coordination needs | Select when cost sensitivity outweighs need for frequency tuning or synchronization; verify thermal performance at 4A. |
| TPS544B25RJER | 4.5–18V input, 4A, 0.6V reference, PMBus interface, 3.5mm × 3.5mm QFN-16, integrated MOSFETs | Supports telemetry and digital configuration but requires external EEPROM and PMBus host; higher VIN range adds complexity for 5V-only systems | Choose only if digital monitoring, margining, or multi-rail coordination via PMBus is required; otherwise over-specified. |
Compared with MP2315DJ-LF-Z and TPS544B25RJER, the AP3440FNTR-G1 uniquely balances analog flexibility (programmable frequency, sync, UVLO, soft-start) with minimal external components and industry-standard 3mm × 3mm footprint-ideal for analog-centric, space-constrained, high-transient designs without digital infrastructure.
Availability
AP3440FNTR-G1 is available at Aetrix Electronics and suitable for high-density power systems, point-of-load regulation for FPGAs/ASICs/microprocessors, and broadband networking infrastructure requiring stable component supply despite end-of-life status.
Supply support for AP3440FNTR-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 industrial, computing, and communications markets.
The AP3440 belongs to Diodes' high-performance synchronous buck converter product line, engineered specifically for compact, efficient point-of-load regulation in FPGA, ASIC, and microprocessor applications demanding low profile, high current, and robust protection.
FAQ
Is AP3440FNTR-G1 still in active production?
No. Diodes Incorporated officially discontinued the AP3440FNTR-G1; the datasheet (DS36691 Rev. 4, October 2018) states "OBSOLETE – PART DISCONTINUED" and "NO ALTERNATE PART." Aetrix Electronics maintains limited legacy stock with full traceability and offers engineering support for last-time buys and design continuity.
Can AP3440FNTR-G1 start up into a pre-biased output?
Yes. The AP3440FNTR-G1 supports soft-start into pre-biased outputs: its internal soft-start circuit discharges the SS pin to 40mV upon fault conditions (UVLO, thermal shutdown, EN disable), then reinitiates a controlled ramp when re-enabled-preventing reverse current flow and ensuring safe startup with existing VOUT voltage.
What is the minimum recommended input capacitance?
The minimum effective input capacitance is 4.7µF (X5R/X7R ceramic), placed as close as possible to VIN and GND pins. This value accounts for DC bias derating; actual installed capacitance may need to be higher (e.g., 10µF) depending on input impedance and ripple current requirements-calculated per Equation 7 in the datasheet.
How does the AP3440FNTR-G1 handle short-circuit conditions?
Under short-circuit, the AP3440FNTR-G1 enters hiccup mode: after six consecutive current-limit events, both MOSFETs shut off for ~2.5ms, then attempt restart. This limits average power dissipation and prevents thermal runaway while maintaining detectable fault signaling via PGD deassertion and COMP saturation.
AP3440FNTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 16-UFQFN 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):
- 2.95V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.803V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 4A
- Frequency - Switching:
- 200kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-QFN3030-16 (Type B)
AP3440FNTR-G1 FAQ
1.How can I place an order for AP3440FNTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3440FNTR-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 AP3440FNTR-G1 reliable?
The price and inventory of AP3440FNTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3440FNTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3440FNTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3440FNTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3440FNTR-G1?
AP3440FNTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3440FNTR-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 AP3440FNTR-G1?
For technical support, including AP3440FNTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3440FNTR-G1 requirements.
6.How does Aetrix verify that AP3440FNTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3440FNTR-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 AP3440FNTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3440FNTR-G1?
All AP3440FNTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3440FNTR-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 AP3440FNTR-G1 part is unused and in its original packaging.
Return procedure for AP3440FNTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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