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Infineon Technologies IR3447AMTRPBFAUMA1
- Part No.:
- IR3447AMTRPBFAUMA1
- Manufacturer:
- Infineon Technologies
- Package:
- 29-PowerVFQFN
- Datasheet:
-
IR3447AMTRPBFAUMA1.pdf
- Description:
- IC REG BUCK ADJ 25A VIQFN-29
- Quantity:
- Payment:
- Shipping:
Inventory:1,920
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Product details
Overview
IR3447AMTRPBFAUMA1 from Infineon is a fully integrated synchronous Buck regulator with integrated OptiMOS™ power MOSFETs, delivering up to 25 A output current. It operates from a single 4.3–17 V input or extends to 2–17 V with external VCC bias, features a 0.6 V ±0.5% reference voltage, 600 kHz fixed switching frequency in Forced Continuous Conduction Mode (FCCM), and supports ceramic output capacitors without external compensation. It is deployed in server point-of-load (POL) rails supplying CPU core or memory subsystems.
For engineers reviewing the IR3447AMTRPBFAUMA1 datasheet, IR3447AMTRPBFAUMA1 pinout, IR3447AMTRPBFAUMA1 application, or IR3447AMTRPBFAUMA1 equivalent, key selection criteria include its thermally compensated dual OCP threshold, monotonic 2 ms soft-start with pre-bias startup support, Power Good open-drain output, and PQFN 5 mm × 6 mm package with integrated bootstrap diode and internal LDO.
Technical Context
The IR3447A implements a Fast Constant On-Time (COT) control architecture with adaptive on-time generation, enabling fast transient response and inherent stability with ceramic output capacitors. Its internal LDO powers the controller from VIN or an external VCC supply, allowing flexible biasing across wide input ranges.
It integrates high- and low-side OptiMOS™ MOSFETs with RDS(on) optimized for 25 A continuous operation, supports pseudo-constant-frequency operation via ramp injection, and embeds comprehensive protection: thermally compensated overcurrent (two selectable thresholds), over/under-voltage detection at VSNS/FB, thermal shutdown, and hiccup-mode fault recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 25 A continuous - supports high-density POL rails for CPUs and FPGAs without external MOSFETs. |
| Input Voltage Range | 4.3–17 V (single supply) or 2–17 V (with external VCC) - enables compatibility with 3.3 V, 5 V, 12 V, and 15 V intermediate bus architectures. |
| Reference Voltage | 0.6 V ±0.5% - ensures tight output regulation (±12 mV) critical for sub-1 V core supplies. |
| Switching Frequency | 600 kHz fixed in FCCM - balances efficiency, size, and EMI; eliminates frequency variation under load transients. |
| Soft-Start Time | 2 ms monotonic - prevents inrush current and ensures controlled rail ramp-up during system power-on. |
| OCP Threshold | Two user-selectable settings via ILIM pin (GND or floating) - allows tuning for peak current vs. thermal margin in different PCB layouts. |
| Operating Junction Temp | −40 °C to +125 °C - qualified for industrial environments per JEDEC JESD22-A104/JESD22-A108. |
Pinout & Package
IR3447AMTRPBFAUMA1 is housed in a thermally enhanced 5 mm × 6 mm PQFN package with exposed thermal pad (PGND-connected) and 32-pin layout optimized for high-current POL applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN | Power Input (High-Side Switch Source) | Main power stage input; requires low-ESR bypass caps near PGND to minimize switching loop inductance. |
| SW | Power Switch Node | Connects to output inductor; carries full AC switching current; must be routed with minimal parasitic inductance. |
| BOOT | Bootstrap Supply | Drives high-side gate via external capacitor tied between BOOT and SW; enables self-biased high-side driver. |
| VCC/LDO | Bias Supply I/O | Supplies internal circuitry; accepts external 3.3–5 V bias or outputs regulated ~5 V from internal LDO when powered from VIN. |
| EN | Enable Control Input | Active-high logic input with voltage monitoring; asserts PGood only after stable output and internal power sequencing. |
| PGood | Status Output | Open-drain signal indicating regulated output within ±7.5% of target; requires external pull-up to VCC/LDO or system rail. |
| FB / VSNS | Feedback / OVP Sense | FB sets output voltage via resistor divider; VSNS provides independent overvoltage detection path for safety-critical systems. |
| RS+/RS− / RSo+/RSo− | Pseudo Remote Sensing | Enables remote voltage sensing at load to compensate for IR drop in PCB traces; RS+ and RS− connect directly to load terminals. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated OptiMOS™ MOSFETs | Eliminates external high- and low-side FETs and gate drivers, reducing BOM count and layout complexity for compact POL designs. |
| Fast COT Control | Delivers <1 µs load transient response without external compensation components, simplifying design validation for dynamic loads like CPUs. |
| Thermally Compensated OCP | Adjusts current limit threshold with junction temperature to maintain consistent overcurrent protection across operating range. |
| Pre-Bias Start-Up | Allows safe startup into pre-charged output capacitors without reverse current flow or output voltage overshoot. |
| Internal LDO with Dual Bias Mode | Supports single-supply operation (PVIN powers controller) or extended input range using external VCC, improving system-level flexibility. |
Applications
| Server Core Voltage Regulation | Enterprise SSD Power Management |
|---|---|
|
Use Scenario: Regulating 0.8–1.2 V core supply for dual-socket Xeon processors in 1U rack servers. IC Role / Device Role / Timing Role: Primary POL regulator delivering 25 A with fast transient response to handle CPU DVFS transitions. Use Value: Integrated MOSFETs and COT control reduce output capacitance by ≥30% versus traditional controllers, saving board space in thermally constrained chassis. |
Use Scenario: Providing stable 3.3 V and 1.8 V rails for NVMe SSD controller and NAND flash arrays in datacenter storage shelves. IC Role / Device Role / Timing Role: Secondary POL regulator with remote sensing (RS+/RS−) compensating for voltage drop across backplane connectors. Use Value: Monotonic 2 ms soft-start prevents inrush-induced brownout on shared 12 V intermediate bus during hot-plug SSD insertion. |
| Telecom Baseband Unit (BBU) | Industrial FPGA I/O Bank Supply |
|
Use Scenario: Generating 1.0 V @ 15 A for ASIC-based baseband processing in 5G macrocell radios with strict thermal limits. IC Role / Device Role / Timing Role: High-efficiency POL regulator operating at 600 kHz to avoid interference with RF front-end harmonics. Use Value: PQFN 5×6 mm package with exposed thermal pad achieves ≤2.5 °C/W θJA, enabling convection-only cooling in sealed enclosures. |
Use Scenario: Supplying configurable 1.2–1.8 V I/O banks for Xilinx Kintex Ultrascale+ FPGAs in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Programmable POL regulator with FB/VSNS dual-sense capability ensuring voltage accuracy under varying load currents and ambient temperatures. Use Value: Two selectable OCP thresholds allow optimization for either peak current headroom (floating ILIM) or thermal derating (ILIM = GND) in fanless industrial cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous Buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP8765GQ-Z (Monolithic Power) | 20 A rated, 500 kHz switching, no integrated bootstrap diode, requires external high-side gate driver. | Lacks pre-bias start-up and thermally compensated OCP; less robust in high-reliability telecom/server use cases. | Preferred where cost sensitivity outweighs need for advanced protection and startup behavior. |
| TPS546B24RVFT (Texas Instruments) | 25 A, 400–2000 kHz programmable frequency, digital PMBus interface, no integrated MOSFETs. | Requires external FETs and complex loop compensation; supports telemetry and dynamic voltage scaling not available in IR3447A. | Chosen when system-level monitoring, firmware updates, or multi-rail coordination are required. |
Compared with MP8765GQ-Z and TPS546B24RVFT, the IR3447AMTRPBFAUMA1 delivers higher integration (no external FETs or driver), simpler analog design (no compensation), and stronger analog protection-making it optimal for cost-constrained, high-volume industrial and telecom POL applications where digital control is unnecessary.
Availability
IR3447AMTRPBFAUMA1 is available at Aetrix Electronics and suitable for server motherboard power delivery, enterprise SSD power rails, and 5G baseband unit POL stages requiring stable component supply, long-term lifecycle support, and RoHS2-compliant packaging.
Supply support for IR3447AMTRPBFAUMA1 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
Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with leadership in silicon and silicon carbide power devices.
The IR3447A belongs to Infineon's OptiMOS™ IPOL family, designed specifically for high-current, low-voltage point-of-load regulation in space-constrained server, storage, and telecom infrastructure equipment.
FAQ
What is the recommended input capacitor configuration for IR3447AMTRPBFAUMA1?
A minimum of three 22 µF X5R/X7R ceramic capacitors (0805 or larger) placed within 3 mm of PVIN and PGND pins is required. One capacitor must be located adjacent to the BOOT–SW node to ensure stable high-side gate drive. Total input capacitance should exceed 66 µF to suppress ripple below 50 mVpp at 25 A load step.
Does IR3447AMTRPBFAUMA1 support remote voltage sensing, and how is it implemented?
Yes, it supports pseudo-remote sensing via dedicated RS+ and RS− pins. RS+ connects to the load's positive terminal and RS− to the load's ground return, while RSo+ and RSo− provide internal reference grounding. This configuration compensates for IR drop in PCB traces or connectors, maintaining ±0.5% output accuracy at the load under full current.
How does the ILIM pin select between the two overcurrent protection thresholds?
Leaving ILIM floating selects the higher OCP threshold (~32 A typical), suitable for peak transient handling. Connecting ILIM to PGND selects the lower threshold (~25 A typical), prioritizing thermal margin and long-term reliability. The selection is latched at power-on and cannot be changed dynamically during operation.
Can IR3447AMTRPBFAUMA1 operate without an external VCC supply, and what are the implications?
Yes-it operates from PVIN alone using its internal LDO to generate VCC/LDO voltage. However, this restricts the minimum PVIN to 4.3 V. Using an external 3.3–5 V VCC supply extends the usable input range down to 2 V, enabling compatibility with low-voltage intermediate buses and improving light-load efficiency by bypassing the LDO dropout loss.
IR3447AMTRPBFAUMA1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- OptiMOS™ IPOL
- Package/Case:
- 29-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 7.5V
- Current - Output:
- 25A
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PG-VIQFN-29
IR3447AMTRPBFAUMA1 FAQ
1.How can I place an order for IR3447AMTRPBFAUMA1 through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3447AMTRPBFAUMA1 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 IR3447AMTRPBFAUMA1 reliable?
The price and inventory of IR3447AMTRPBFAUMA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3447AMTRPBFAUMA1 is usually 5 days.
3.What payment methods are accepted for IR3447AMTRPBFAUMA1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3447AMTRPBFAUMA1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3447AMTRPBFAUMA1?
IR3447AMTRPBFAUMA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3447AMTRPBFAUMA1 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 IR3447AMTRPBFAUMA1?
For technical support, including IR3447AMTRPBFAUMA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3447AMTRPBFAUMA1 requirements.
6.How does Aetrix verify that IR3447AMTRPBFAUMA1 is sourced from the original manufacturer or authorized distributors?
All IR3447AMTRPBFAUMA1 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 IR3447AMTRPBFAUMA1 meets industry standards.
7.What is the process for return or replacement of IR3447AMTRPBFAUMA1?
All IR3447AMTRPBFAUMA1 units undergo pre-shipment inspection (PSI). If there is an issue with IR3447AMTRPBFAUMA1, 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 IR3447AMTRPBFAUMA1 part is unused and in its original packaging.
Return procedure for IR3447AMTRPBFAUMA1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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