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Infineon Technologies IR3447MTR1PBF
- Part No.:
- IR3447MTR1PBF
- Manufacturer:
- Infineon Technologies
- Package:
- 35-PowerVQFN
- Datasheet:
-
IR3447MTR1PBF.pdf
- Description:
- IC REG BUCK ADJ 25A 35PQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,901
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Product details
Overview
IR3447MTR1PBF from Infineon Technologies (formerly International Rectifier) is a highly integrated synchronous buck regulator with integrated high- and low-side MOSFETs, internal PWM controller, and Smart LDO. It delivers up to 25A output current, supports 1.5V–21V input, 0.6V–0.86×PVin output, and features 0.5% reference accuracy, programmable 300–1500kHz switching frequency, and true differential remote sensing - used in server point-of-load power delivery.
For engineers reviewing the IR3447MTR1PBF datasheet, IR3447MTR1PBF pinout, IR3447MTR1PBF application, or IR3447MTR1PBF equivalent, key selection criteria include its integrated power stage, feed-forward line regulation, hiccup-mode overcurrent protection, thermal shutdown, and programmable power-good output with OVP active during disable.
Technical Context
The IR3447 implements a voltage-mode PWM control architecture with feed-forward compensation for enhanced line regulation, and integrates a dedicated remote sense amplifier with ±2mV offset over –40°C to 125°C. Its digital soft-start clock runs at 180–220kHz, and zero-crossing detection enables precise dead-time control.
It combines a 4.0–4.4mΩ high-side and 1.8–2.3mΩ low-side MOSFET pair, thermally compensated current limit set via OCset pin (three discrete thresholds), and a Smart LDO that supplies VCC/LDO_out at 6.3–7.1V (load-dependent) while reducing system-level bias supply complexity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ±25A continuous - supports high-current CPU/GPU core rails without external MOSFETs |
| Input Voltage Range | 1.5V–21V with external Vcc - enables flexible bus architectures including 5V, 12V, and 19V intermediate buses |
| Reference Accuracy | ±0.5% at 0°C–105°C - ensures tight output regulation for sub-1V logic supplies |
| Switching Frequency | 300–1500kHz programmable via Rt/Sync pin - allows optimization of size vs. efficiency and EMI |
| Remote Sense Offset | ±2mV over full temperature range - maintains <1% output error under PCB voltage drop |
| Thermal Shutdown | Active at Tj ≥ 150°C - protects against sustained overload or airflow loss in dense server modules |
| Power Good Output | Open-drain PGD with OVP active even when Enable = low - enables safe sequencing and fault isolation |
Pinout & Package
IR3447MTR1PBF is housed in a thermally enhanced 5mm × 6mm PQFN package with exposed thermal pad (pin 34, connected to PGND internally). The 33-pin layout includes dual ground planes (PGND and LGND), dedicated remote sense inputs (RS+, RS−), and integrated bootstrap diode - enabling compact, high-efficiency layouts with minimal external components.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVin (1) | Main power input to high-side FET | Connects directly to bulk input capacitor; feeds feed-forward path and must be decoupled near PGND |
| Boot (2) | High-side gate driver supply | Driven by internal bootstrap diode; requires 10nF ceramic cap to SW for reliable high-side turn-on |
| Enable (3) | Global IC enable with UVLO | 1.2V threshold rising edge; monitors Vin rail integrity before startup |
| Rt/Sync (4) | Frequency programming / sync input | Resistor sets fSW (300–1500kHz); accepts external clock for EMI reduction |
| OCset (5) | Current limit configuration | Floating = 25A, tied to VCC = 20A, tied to PGND = 15A - sets hiccup-mode trip point |
| Vsns (6) | OVP and Power Good sense node | Dedicated input for overvoltage detection; remains active during Enable=low |
| FB (7) | Error amplifier inverting input | Connects to output or remote sense amp; sets VOUT via resistor divider referenced to 0.6V |
| COMP (8) | Error amplifier output | Requires RC network to FB for loop stability - typical pole-zero placement per application note |
| RSo (9) | Remote sense amplifier output | Drives FB node; provides gain-stabilized feedback from load point |
| PGND (10,26,27,29) | Power ground return | Multipoint connection to thermal pad and input/output capacitors - critical for EMI and thermal performance |
| LGND (11) | Signal reference ground | Isolated from PGND to prevent noise coupling into error amplifier and reference circuitry |
| RS− (12), RS+ (13) | Differential remote sense inputs | RS− connects to load ground; RS+ connects to load VOUT - enables true Kelvin sensing |
| CByp (14) | Reference bypass capacitor | 100–180pF to LGND stabilizes 0.6V bandgap reference; essential for accuracy |
| PGD (16) | Power Good open-drain output | Pull-up required; asserts high when VOUT is within ±10% and no faults detected |
| Vin (17) | LDO input supply | Must be ≥5V; powers internal logic and drivers when VCC is not externally supplied |
| VCC/LDO_out (18) | Internal LDO output | Supplies gate drivers and control logic; requires ≥4.7µF ceramic cap to PGND |
| SW (20–25,32) | Switch node | Connects to output inductor; high di/dt node requiring short, low-inductance routing |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 4.0mΩ/1.8mΩ Rds(on) MOSFET pair eliminates external FETs and gate drivers - reduces BOM count and layout area by >40% |
| True Differential Remote Sensing | ±2mV offset over –40°C to 125°C - maintains ±0.5% output accuracy across PCB trace resistance up to 20mΩ |
| Enhanced Pre-Bias Start-up | Allows controlled ramp-up into pre-biased outputs - prevents reverse current and inrush damage in hot-swap systems |
| Body Braking | Actively discharges output capacitance during light-load transients - improves load-step response by 30% vs. standard buck |
| Programmable Power Good | Adjustable trip threshold via external resistor divider on Vsns - enables custom OVP and sequencing windows |
Applications
| Server Core Voltage Regulation | Distributed Point-of-Load (PoL) |
|---|---|
|
Use Scenario: Regulating 0.8–1.2V core supplies for multi-core Xeon or EPYC processors in 1U/2U rack servers. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with integrated power stage and remote sensing - replaces discrete controller + dual MOSFET solution. Use Value: Delivers 25A at >90% efficiency (12V→1.2V/25A @ 600kHz), reduces thermal footprint by eliminating external drivers and FETs. |
Use Scenario: Local DC/DC conversion on PCIe add-in cards or FPGA mezzanine modules with tight space constraints. IC Role / Device Role / Timing Role: Self-contained PoL regulator supporting dynamic voltage scaling (DVS) via programmable fSW and soft-start timing. Use Value: Enables single-layer PCB design with only 4 external passives (inductor, input/output caps, feedback divider) - cuts layout time by 50%. |
| Set-Top Box SoC Power | Industrial Embedded Computing |
|
Use Scenario: Powering 1.0V/1.8V rails for ARM-based media SoCs in consumer STBs with strict EMI limits. IC Role / Device Role / Timing Role: Synchronous buck with external sync capability - locks switching to system clock to suppress narrowband EMI peaks. Use Value: Meets FCC Class B conducted emissions without shielding, using 1.2MHz sync and optimized layout per AN-1152. |
Use Scenario: Providing stable 0.9V/1.1V supplies for industrial-grade i.MX8 or AM6x processors operating in –40°C to 85°C ambient. IC Role / Device Role / Timing Role: Robust PoL regulator with extended junction temp rating (–40°C to 125°C) and hiccup-mode fault recovery. Use Value: Eliminates need for external current-sense amplifiers and thermal monitoring ICs - simplifies safety-critical BOM validation. |
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) | 20A rated, 2.5mΩ/1.2mΩ Rds(on), no integrated remote sense amp or body braking | Lacks true differential sensing and pre-bias start-up - less suitable for high-accuracy server rails | Prefer for cost-sensitive, lower-current (<20A) embedded designs where remote sensing is not required |
| TPS53689TSSR (Texas Instruments) | 30A rated, D-CAP3 control, no integrated LDO or bootstrap diode - requires external bias supply | Supports multi-phase operation and PMBus interface - targets higher-end server VRMs with telemetry | Choose when digital control, phase interleaving, or telemetry are mandatory; adds complexity and BOM cost |
Compared with MP8765GQ-Z and TPS53689TSSR, IR3447MTR1PBF uniquely integrates remote sense amplification, body braking, and Smart LDO in a single 5×6mm PQFN - delivering highest functional integration for space-constrained, high-accuracy 25A PoL applications without digital overhead.
Availability
IR3447MTR1PBF is available at Aetrix Electronics and suitable for server motherboard power delivery, distributed point-of-load conversion, and set-top box SoC regulation requiring stable component supply and long-term industrial availability.
Supply support for IR3447MTR1PBF 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 global semiconductor leader specializing in power management, automotive, and industrial control ICs, with deep expertise in high-efficiency power conversion and ruggedized packaging.
The SupIRBuck™ product line was engineered for high-density, high-reliability DC/DC conversion in datacenter and telecom infrastructure - emphasizing integration, thermal robustness, and system-level protection without external supervision.
FAQ
What is the minimum recommended output capacitance for stable 25A operation?
For 25A operation at 600kHz, use ≥470µF total output capacitance with ≤5mΩ ESR, split across ≥4 low-ESR ceramic or polymer capacitors placed adjacent to the SW and PGND pins. Layout must minimize loop inductance - refer to Figure 1 in AN-1152 for optimal placement relative to the PQFN thermal pad.
Can IR3447MTR1PBF operate without an external VCC supply?
Yes - it can self-bias via the Smart LDO using Vin (≥5V) as input, generating VCC/LDO_out at 6.3–7.1V. However, when Vin < 7.2V, VCC drops to 4.0–4.8V and maximum output current is reduced to 20A due to gate drive voltage limitation; external 5V VCC is recommended for full 25A capability.
How does the OCset pin configure current limit thresholds?
OCset selects one of three hiccup-mode current limits: floating = 25A, tied to VCC = 20A, tied to PGND = 15A. This setting adjusts the internal current-sense amplifier gain and is latched at power-up - changing it mid-operation has no effect until next enable cycle.
Is remote sensing mandatory, or can FB be connected directly to the output?
Remote sensing is optional. FB can be connected directly to the local output node for simpler designs, but doing so forfeits the ±2mV offset advantage and introduces up to ±15mV error from PCB IR drop. True differential sensing (RS+/RS−) is required to achieve guaranteed 0.5% output accuracy across temperature and load.
IR3447MTR1PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- SupIRBuck®
- Package/Case:
- 35-PowerVQFN
- 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):
- 5V
- Voltage - Input (Max):
- 21V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 18.06V
- Current - Output:
- 25A
- Frequency - Switching:
- 300kHz ~ 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 35-PQFN (5x6)
IR3447MTR1PBF FAQ
1.How can I place an order for IR3447MTR1PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3447MTR1PBF 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 IR3447MTR1PBF reliable?
The price and inventory of IR3447MTR1PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3447MTR1PBF is usually 5 days.
3.What payment methods are accepted for IR3447MTR1PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3447MTR1PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3447MTR1PBF?
IR3447MTR1PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3447MTR1PBF 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 IR3447MTR1PBF?
For technical support, including IR3447MTR1PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3447MTR1PBF requirements.
6.How does Aetrix verify that IR3447MTR1PBF is sourced from the original manufacturer or authorized distributors?
All IR3447MTR1PBF 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 IR3447MTR1PBF meets industry standards.
7.What is the process for return or replacement of IR3447MTR1PBF?
All IR3447MTR1PBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3447MTR1PBF, 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 IR3447MTR1PBF part is unused and in its original packaging.
Return procedure for IR3447MTR1PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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