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Infineon Technologies IR3447AMTRPBFAUMA2
- Part No.:
- IR3447AMTRPBFAUMA2
- Manufacturer:
- Infineon Technologies
- Package:
- 29-PowerVFQFN
- Datasheet:
-
IR3447AMTRPBFAUMA2.pdf
- Description:
- IC REG BUCK ADJ 25A VIQFN-29
- Quantity:
- Payment:
- Shipping:
Inventory:3,995
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Product details
Overview
IR3447AMTRPBFAUMA2 from Infineon is a fully integrated 25 A synchronous Buck regulator with integrated OptiMOS™ power stages, Fast Constant On-Time (COT) control, 600 kHz switching frequency, 0.6 V ±0.5% reference voltage, and forced continuous conduction mode (FCCM). It operates from 4.3–17 V (single supply) or 2–17 V (with external VCC), delivering high-efficiency point-of-load power for server VRMs.
For engineers reviewing the IR3447AMTRPBFAUMA2 datasheet, IR3447AMTRPBFAUMA2 pinout, IR3447AMTRPBFAUMA2 application, or IR3447AMTRPBFAUMA2 equivalent, key selection criteria include its thermally compensated dual OCP settings, monotonic 2 ms soft-start, pre-bias start-up capability, and PQFN 5 mm × 6 mm package with integrated bootstrap diode and internal LDO.
Technical Context
The IR3447A implements a Fast COT control architecture that eliminates external compensation while maintaining stability with ceramic output capacitors. Its adaptive on-time generator enables pseudo-constant switching frequency and fast transient response without loop tuning.
It integrates a thermally compensated over-current protection circuit with two user-selectable thresholds via the ILIM pin, plus independent UVP/OVP/OTP blocks, a 1.2 V PGood threshold, and a dedicated pseudo-remote sensing path (RS+/RS−) for load-point voltage regulation accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 25 A continuous - supports high-density server and telecom POL rails without external MOSFETs |
| Input Voltage Range | 4.3–17 V (single supply) or 2–17 V (with external VCC) - enables flexible biasing in multi-rail systems |
| Reference Voltage | 0.6 V ±0.5% - enables precise output programming down to sub-1 V with <±6 mV tolerance |
| Switching Frequency | 600 kHz - balances efficiency, size, and EMI for mid-power POL applications |
| Soft-Start Time | 2 ms monotonic - prevents inrush current and ensures controlled rail ramp-up into pre-biased loads |
| Operating Junction Temp | –40 °C to +125 °C - qualified for industrial environments per JEDEC47/20/22 |
| OCP Configuration | Two selectable thresholds via ILIM pin (GND or floating) - allows dynamic current limit adaptation per system fault strategy |
Pinout & Package
PQFN 5 mm × 6 mm, 33-pin package with exposed thermal pad; RoHS2-compliant, halogen-free, and moisture-sensitive level 3 (MSL3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN | Power Input (High-Side Switch Source) | Main input rail for power stage; requires low-ESR bypassing directly to PGND for noise immunity and current delivery |
| SW | Power Switch Node | Connection to output inductor; carries full switching current and high dv/dt - critical for layout integrity |
| BOOT | Bootstrap Supply | Drives high-side gate via external capacitor; tied to SW during low-side conduction to self-charge |
| EN | Enable Control Input | Active-high logic input with internal voltage monitoring; asserts PGood only after stable regulation is confirmed |
| PGood | Open-Drain Status Output | Signals valid output regulation (VOUT ≥ 90% of setpoint); requires external pull-up to VCC/LDO or system bias rail |
| FB / VSNS | Feedback / OVP Sense Input | Primary feedback node (FB) sets output voltage; VSNS provides redundant OVP and PGood monitoring path |
| RS+ / RS− | Pseudo-Remote Sensing Inputs | Enable Kelvin-style load-point sensing - RS+ connects to load, RS− to local AGND, improving regulation under PCB IR drop |
| ILIM | OCP Threshold Select | Grounding or floating selects between two thermally compensated current limits - no resistor needed |
Key Features
| Feature | Design Value |
|---|---|
| Integrated OptiMOS™ Power Stages | Eliminates discrete high/low-side MOSFET selection, layout, and gate drive design effort |
| Fast COT Control Engine | Stabilizes with ceramic output caps only - no external compensation network required |
| Internal LDO with VCC/LDO Pin | Enables single-supply operation or extended input range using external bias - reduces BOM count |
| Pre-Bias Start-Up | Allows safe startup into already-powered outputs without reverse current or latch-up risk |
| Thermal Shutdown & Hiccup Mode | Shuts down at Tj ≥ 150 °C and restarts after cooldown - protects against sustained overload or airflow loss |
Applications
| Server VRM | Storage Controller Rail |
|---|---|
Use Scenario: Regulating 0.8–1.2 V core voltage for dual-socket Xeon processors with dynamic load steps up to 20 A/µs. IC Role / Device Role / Timing Role: Primary POL regulator with integrated power stage and Fast COT control for sub-100 ns transient response. Use Value: Delivers 25 A continuous current in 30 mm² footprint while maintaining ±0.5% output accuracy under load transients. | Use Scenario: Powering NVMe SSD controller ASICs requiring tightly regulated 1.8 V or 3.3 V with low noise and fast recovery from deep sleep states. IC Role / Device Role / Timing Role: Secondary POL regulator with monotonic soft-start and pre-bias capability for hot-plug compatibility. Use Value: Enables zero-reverse-current startup into pre-biased rails and maintains regulation during PCIe link state transitions. |
| Telecom Baseband Unit | Datacom Switch ASIC Core |
Use Scenario: Supplying 0.95 V @ 15 A to FPGA-based baseband processing units in 5G macro radios with strict thermal envelope. IC Role / Device Role / Timing Role: High-efficiency POL converter with FCCM mode to suppress acoustic noise and ensure consistent timing margin. Use Value: Achieves >92% peak efficiency at 12 V input and sustains 25 A output with junction temperature ≤125 °C under forced air cooling. | Use Scenario: Delivering 0.75 V @ 20 A to multi-core switch ASICs in 1U datacenter switches with dense board layout constraints. IC Role / Device Role / Timing Role: Compact, integrated buck regulator with pseudo-remote sensing (RS+/RS−) to compensate for PCB voltage drop. Use Value: Maintains ±1% output accuracy at the ASIC die despite 30 mΩ trace resistance between regulator and load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | 3 A max output, external MOSFETs required, 2–36 V input, no integrated bootstrap diode | Suitable for lower-current, cost-sensitive industrial rails - lacks pre-bias start-up and remote sensing | Select when total solution cost dominates and current demand is ≤3 A |
| TPS546B24RVFT | 40 A output, PMBus interface, digital control, 4.5–18 V input, larger 6 mm × 6 mm QFN | Required for telemetry, sequencing, and dynamic voltage scaling in high-end servers | Select when digital configuration, telemetry, or >25 A output is mandatory |
Compared with MP2451DT-LF-Z and TPS546B24RVFT, the IR3447AMTRPBFAUMA2 uniquely balances integration (integrated FETs + bootstrap diode + LDO), analog simplicity (no firmware or PMBus), and industrial-grade reliability - making it optimal for fixed-function 20–25 A POLs where footprint, BOM count, and startup robustness are prioritized over programmability or ultra-low quiescent current.
Availability
IR3447AMTRPBFAUMA2 is available at Aetrix Electronics and suitable for server VRMs, storage controller rails, telecom baseband units, and datacom switch ASIC cores requiring stable component supply, long-lifecycle support, and JEDEC-qualified industrial reliability.
Supply support for IR3447AMTRPBFAUMA2 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 MCUs, and industrial control ICs, with global manufacturing and qualification infrastructure.
The IR3447A belongs to Infineon's OptiMOS™ IPOL (Integrated POL) product line, designed specifically for compact, high-current, analog-controlled point-of-load regulators in space-constrained server, storage, and networking equipment.
FAQ
What input voltage configurations does the IR3447AMTRPBFAUMA2 support?
The device supports two input configurations: single-supply operation from 4.3 V to 17 V applied to PVIN, or extended-range operation from 2 V to 17 V by supplying an external bias to the VCC/LDO pin while connecting VIN to VCC/LDO. The internal LDO powers control circuitry in both modes, eliminating need for auxiliary bias rails.
How does the ILIM pin configure over-current protection?
The ILIM pin offers two factory-trimmed, thermally compensated OCP thresholds: grounding the pin selects the higher current limit (~30 A typical), while leaving it floating selects the lower limit (~22 A typical). No external resistor is required - the setting is purely pin-state dependent and active during normal operation and hiccup-mode fault recovery.
Can the IR3447AMTRPBFAUMA2 start up into a pre-biased output?
Yes - the device features enhanced pre-bias start-up logic that monitors output voltage before enabling switching. It prevents reverse current flow by delaying high-side FET turn-on until the output voltage decays below the programmed regulation point, ensuring safe startup into powered loads such as hot-swappable modules or powered-backplane systems.
What is the purpose of the RS+ and RS− pins?
RS+ and RS− implement pseudo-remote voltage sensing: RS+ connects directly to the load's VDD pin, RS− to local AGND, forming a dedicated Kelvin path for the internal reference. This compensates for PCB trace IR drop between the regulator and load, improving output regulation accuracy to ±1% at the point of load - critical for low-voltage, high-current ASIC supplies.
IR3447AMTRPBFAUMA2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- OptiMOS™ IPOL
- Package/Case:
- 29-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
IR3447AMTRPBFAUMA2 FAQ
1.How can I place an order for IR3447AMTRPBFAUMA2 through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3447AMTRPBFAUMA2 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 IR3447AMTRPBFAUMA2 reliable?
The price and inventory of IR3447AMTRPBFAUMA2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3447AMTRPBFAUMA2 is usually 5 days.
3.What payment methods are accepted for IR3447AMTRPBFAUMA2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3447AMTRPBFAUMA2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3447AMTRPBFAUMA2?
IR3447AMTRPBFAUMA2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3447AMTRPBFAUMA2 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 IR3447AMTRPBFAUMA2?
For technical support, including IR3447AMTRPBFAUMA2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3447AMTRPBFAUMA2 requirements.
6.How does Aetrix verify that IR3447AMTRPBFAUMA2 is sourced from the original manufacturer or authorized distributors?
All IR3447AMTRPBFAUMA2 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 IR3447AMTRPBFAUMA2 meets industry standards.
7.What is the process for return or replacement of IR3447AMTRPBFAUMA2?
All IR3447AMTRPBFAUMA2 units undergo pre-shipment inspection (PSI). If there is an issue with IR3447AMTRPBFAUMA2, 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 IR3447AMTRPBFAUMA2 part is unused and in its original packaging.
Return procedure for IR3447AMTRPBFAUMA2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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