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Infineon Technologies IR3448MTR1PBF
- Part No.:
- IR3448MTR1PBF
- Manufacturer:
- Infineon Technologies
- Package:
- 35-PowerVQFN
- Datasheet:
-
IR3448MTR1PBF.pdf
- Description:
- IC REG BUCK ADJ 16A 35PQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,999
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Product details
Overview
IR3448MTR1PBF from Infineon Technologies is a highly integrated synchronous buck DC-DC regulator with integrated high- and low-side MOSFETs, 16A output current capability, 0.6V to 0.86×PVin adjustable output voltage, 300–1500 kHz programmable switching frequency, and true differential remote sensing. It delivers precise power in server point-of-load and set-top box applications.
For engineers reviewing the IR3448MTR1PBF datasheet, IR3448MTR1PBF pinout, IR3448MTR1PBF application, or IR3448MTR1PBF equivalent, key selection considerations include feed-forward line regulation, thermally compensated hiccup-mode overcurrent protection, programmable power-good thresholds, body braking for transient response, and post-package trimmed dead-time control.
Technical Context
The IR3448 implements a voltage-mode PWM controller with digital soft-start, zero-crossing detection, and feed-forward compensation to enhance line regulation across its 1.5–21V input range. Its internal Smart LDO supplies bias to control circuitry while enabling efficiency optimization at light load.
It integrates dual MOSFET drivers, bootstrap diode, remote sense amplifier (3–9 MHz unity-gain bandwidth), and dedicated OVP/PGOOD circuitry that remains active even when Enable is deasserted. The thermal shutdown and hiccup-mode OC protection operate independently of enable state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ±16 A continuous - supports high-current CPU/GPU core rails without external MOSFETs |
| Input Voltage Range | 1.5 V to 21 V - accommodates wide bus variations including 5 V, 12 V, and 19 V systems |
| Output Voltage Range | 0.6 V to 0.86 × PVin - enables adaptive scaling for modern low-voltage processors |
| Reference Accuracy | ±0.5 % (0–105°C), ±1 % (−40–125°C) - ensures tight output regulation under thermal stress |
| Switching Frequency | 300 kHz to 1.5 MHz - allows optimization of size vs. efficiency via external RT resistor or sync clock |
| Thermal Resistance θJA | 15.4 °C/W - validated on high-conductivity test board, supports 16 A operation at ≤125°C junction |
| Rds(on) Top/Bottom | 6.6 / 2.2 mΩ (typ.) - minimizes conduction loss and improves full-load efficiency |
Pinout & Package
IR3448MTR1PBF uses a thermally enhanced 5 mm × 6 mm PQFN package with exposed PGND paddle (pin 29) and 33-pin layout optimized for high-current power delivery and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVin (1) | Main power input to high-side FET | Bypass capacitor must be placed adjacent to this pin and PGND to minimize loop inductance |
| Boot (2) | High-side gate driver supply | Connected to SW node via external capacitor; regulates top-FET drive voltage |
| Enable (3) | Logic-level on/off control | UVLO thresholds (1.14–1.36 V start) support clean sequencing with system supervisors |
| Rt/Sync (4) | Frequency setting or external clock input | Resistor-to-LGND sets frequency; accepts 270–1650 kHz sync signal with 100–200 ns pulse width |
| OCset (5) | Overcurrent trip level selection | Three settings: float (16 A), tie to VCC (12 A), tie to PGND (8 A) |
| Vsns (6) | OVP and PGood sensing input | Dedicated path for accurate output monitoring independent of enable state |
| FB (7) | Error amplifier inverting input | Connects to output or remote sense amp; sets regulation point via resistor divider |
| Comp (8) | Error amplifier output | External RC network provides loop compensation; 20 V/µs slew rate supports fast transient recovery |
| RS+ / RS− (13/12) | Differential remote sense inputs | True Kelvin sensing at load; 63 kΩ input impedance minimizes trace resistance error |
| VCC/LDO_out (18) | Internal LDO output | Supplies 6.3–7.1 V bias; requires ≥4.7 µF ceramic bypass to PGND |
| PGD (16) | Open-drain Power Good indicator | Active-low signal with programmable rising/falling thresholds (95–125 % VREF) |
| SW (20–25, 32) | Power switch node | Multi-pin connection reduces current density and parasitic inductance in high-dI/dt paths |
| PGND (10, 26, 27, 29) | Power ground return | Exposed thermal pad (pin 29) must be soldered to PCB ground plane for θJB = 2.98 °C/W |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MOSFETs + Drivers | Eliminates 4 external FETs and gate drivers, reducing BOM count and layout area by >30 % |
| Body Braking | Actively sinks inductor current during light-load transients, improving undershoot by up to 40 mV |
| Enhanced Pre-Bias Startup | Allows safe startup into pre-biased output without reverse current or latch-up |
| Thermally Compensated OC Limit | Current threshold scales with junction temperature to maintain consistent fault margin across −40 to 125°C |
| Smart LDO | Reduces quiescent current by 65 % vs. traditional bias supplies at light load, improving standby efficiency |
Applications
| Server VR12/VR13 Core Regulator | Distributed Point-of-Load (POL) |
|---|---|
Use Scenario: Primary 1.2 V/16 A core voltage rail for dual-socket Xeon servers with dynamic load steps up to 100 A/µs. IC Role / Device Role / Timing Role: Fully integrated buck regulator providing regulated output with remote sensing, programmable soft-start, and real-time current limiting. Use Value: Integrated MOSFETs and body braking reduce output capacitance requirement by 30 % while maintaining <±10 mV regulation window. | Use Scenario: Local 0.85 V/12 A supply for FPGA I/O banks in telecom baseband units with strict ripple (<10 mVpp) and sequencing requirements. IC Role / Device Role / Timing Role: Synchronous buck converter with independent enable, power-good, and sync inputs for coordinated multi-rail timing. Use Value: Programmable switching frequency (600 kHz) avoids AM band interference while achieving >92 % peak efficiency at 12 A. |
| Set-Top Box SoC Power | Industrial Embedded Controller |
Use Scenario: 1.1 V/10 A supply for ARM-based multimedia SoC in cable STB, operating from 12 V input with ambient temperature up to 85°C. IC Role / Device Role / Timing Role: Single-input buck regulator with thermal shutdown, hiccup-mode OC protection, and remote sense for stable SoC operation. Use Value: Smart LDO and feed-forward regulation maintain <±0.5 % line/load regulation across 5–21 V input variation and 0–10 A load steps. | Use Scenario: 0.9 V/8 A processor rail in DIN-rail mounted PLC controller with long-term reliability requirements and no fan cooling. IC Role / Device Role / Timing Role: High-efficiency POL regulator with −40 to 125°C junction rating, RoHS-compliant PQFN package, and lifecycle-managed sourcing. Use Value: Post-package trimmed dead-time and θJA = 15.4 °C/W enable full 8 A load at 75°C ambient without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | 12 A max output, no remote sense, fixed 500 kHz fsw, smaller 4×4 mm QFN | Lacks differential sensing and programmable OC; suitable only for non-critical consumer loads | Select when cost and footprint are prioritized over precision regulation and transient immunity |
| TPS53689TSSR | 16 A, dual-phase capable, PMBus interface, 0.5% VREF accuracy, but requires external MOSFETs | Supports telemetry and phase interleaving; adds complexity and BOM cost | Select when digital monitoring, multi-phase scalability, or tighter thermal management is required |
Compared with MP2315DJ-LF-Z and TPS53689TSSR, IR3448MTR1PBF uniquely combines 16 A integration, true differential remote sensing, body braking, and single-chip simplicity-making it optimal for space-constrained, high-transient industrial and compute POL designs where external FETs are undesirable.
Availability
IR3448MTR1PBF is available at Aetrix Electronics and suitable for server VRMs, distributed point-of-load power architectures, and set-top box power supplies requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for IR3448MTR1PBF 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 global manufacturing and quality certification to ISO 9001 and IATF 16949.
The SupIRBuck® product line delivers fully integrated, high-current DC-DC regulators targeting space-constrained, high-efficiency point-of-load applications in datacenter, telecom, and embedded systems where layout simplicity and thermal performance are critical.
FAQ
What is the minimum recommended output capacitance for IR3448MTR1PBF at 16 A load?
The datasheet specifies a minimum 220 µF total output capacitance using low-ESR polymer or MLCCs for stable 16 A operation. This value assumes 0.4 µH inductor and accounts for body braking's effect on transient response. Layout must minimize ESL by placing capacitors within 3 mm of SW and PGND pins.
Can IR3448MTR1PBF operate with PVin = 3.3 V and Vin = 5 V simultaneously?
Yes - the device supports split-input operation: PVin powers the power stage (min 1.5 V), while Vin supplies the LDO and logic (min 5 V). At PVin = 3.3 V, the top FET Rds(on) increases slightly, but full 16 A output remains achievable if thermal design maintains TJ ≤ 125°C per θJA = 15.4 °C/W.
How does the OCset pin configure overcurrent thresholds?
OCset offers three discrete current limits: floating (16 A typ.), tied to VCC (12 A typ.), or tied to PGND (8 A typ.). These correspond to internal reference scaling and are validated across temperature; no external components are needed. The setting affects both hiccup-mode trip point and current limit during normal operation.
Is the IR3448MTR1PBF pin-compatible with earlier IR3447 or IR3449 variants?
No - IR3448 has a unique 33-pin PQFN layout with distinct pin functions (e.g., dedicated Vsns, RS+, RS−, and multi-SW connections). IR3447 uses 28-pin QFN and lacks remote sense; IR3449 adds dual-phase sync but changes OCset and PGD behavior. Board redesign is required for substitution.
IR3448MTR1PBF 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:
- 16A
- 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)
IR3448MTR1PBF FAQ
1.How can I place an order for IR3448MTR1PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3448MTR1PBF 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 IR3448MTR1PBF reliable?
The price and inventory of IR3448MTR1PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3448MTR1PBF is usually 5 days.
3.What payment methods are accepted for IR3448MTR1PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3448MTR1PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3448MTR1PBF?
IR3448MTR1PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3448MTR1PBF 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 IR3448MTR1PBF?
For technical support, including IR3448MTR1PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3448MTR1PBF requirements.
6.How does Aetrix verify that IR3448MTR1PBF is sourced from the original manufacturer or authorized distributors?
All IR3448MTR1PBF 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 IR3448MTR1PBF meets industry standards.
7.What is the process for return or replacement of IR3448MTR1PBF?
All IR3448MTR1PBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3448MTR1PBF, 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 IR3448MTR1PBF part is unused and in its original packaging.
Return procedure for IR3448MTR1PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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