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Infineon Technologies IR3448MTRPBF
- Part No.:
- IR3448MTRPBF
- Manufacturer:
- Infineon Technologies
- Package:
- 35-PowerVQFN
- Datasheet:
-
IR3448MTRPBF.pdf
- Description:
- IC REG BUCK ADJ 16A 35PQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,626
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Product details
Overview
IR3448MTRPBF from Infineon Technologies is a highly integrated synchronous buck DC/DC regulator with integrated high- and low-side MOSFETs, supporting 1.5V–21V input and delivering up to 16A at 0.6V–0.86×PVin output. It features programmable 300–1500kHz switching frequency, 0.5% reference voltage accuracy, remote differential sensing, and smart LDO biasing. Used in server point-of-load power delivery where compact size and thermal robustness are critical.
For engineers reviewing the IR3448MTRPBF datasheet, IR3448MTRPBF pinout, IR3448MTRPBF application, or IR3448MTRPBF equivalent, key selection criteria include its integrated MOSFET drivers, thermally compensated current limit with hiccup mode, post-package trimmed dead-time, true differential remote sense architecture, and dedicated OVP/PGOOD circuitry active even during disable state.
Technical Context
The IR3448 implements a voltage-mode PWM controller with feed-forward input compensation and digital soft-start logic. Its error amplifier delivers 100–120dB DC gain and 20–40MHz GBWP, enabling stable loop response across wide load and line variations. The remote sense amplifier provides 110dB DC gain and 3–9MHz unity-gain bandwidth for precise load regulation.
Protection architecture includes zero-crossing comparator-based overcurrent detection with 256/Fs delay, thermal shutdown at 150°C junction, and independent overvoltage protection triggered by Vsns rising above 125% VREF. The Smart LDO supplies internal circuitry from Vin while maintaining efficiency via dynamic dropout control and dual-output modes (6.3–7.1V or 4.0–4.8V depending on DCM state).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5V–21V with external Vcc; enables single-rail operation from 5V–21V bus or ultra-low-input systems using auxiliary bias. |
| Output Current | ±16A continuous; supports high-current CPU/GPU core rails without external MOSFETs or driver ICs. |
| Reference Accuracy | ±0.5% (0°C–105°C); ensures tight output regulation under thermal stress for memory and logic supply domains. |
| Switching Frequency | 300–1500kHz programmable via Rt resistor or external sync signal; allows EMI tuning and inductor size optimization. |
| Thermal Resistance θJA | 15.4°C/W on high-conductivity test board; validates thermal performance in dense server PCB layouts with 2oz copper. |
| Remote Sense Inputs | True differential RS+/RS− with ±2mV offset (-40°C–125°C); eliminates IR drop errors in long PCB traces or connector paths. |
| Power Good Logic | Dedicated open-drain PGD pin with 95–125% VREF thresholds and 1.28ms rising/falling delays; enables sequenced system power-up without external monitoring. |
Pinout & Package
IR3448MTRPBF uses a thermally enhanced 5mm × 6mm PQFN package with exposed PGND paddle (pin 29) and 33-pin layout optimized for high-current switching and thermal dissipation. Pin 1 (PVin) and pins 10/26/27/29 (PGND) form the primary power loop; SW pins (20,21,22,23,24,25,32) are paralleled for low-inductance inductor connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVin (1) | Main power stage input | Connects to bulk input capacitor; feeds feed-forward block and high-side FET source; requires low-ESR bypassing to PGND. |
| Boot (2) | High-side gate driver supply | Supplies floating voltage for top-FET gate drive; internal bootstrap diode eliminates external component requirement. |
| Enable (3) | Global device activation | UVLO thresholds at 1.14V (rising) and 0.9V (falling); supports sequencing with voltage monitors or microcontroller GPIO. |
| Rt/Sync (4) | Frequency programming/synchronization | Resistor sets nominal frequency (e.g., 39.2kΩ → 600kHz); accepts external clock for EMI reduction or multi-phase alignment. |
| OCset (5) | Current limit configuration | Three-level trip point selection: float (16A), tie to VCC (12A), or tie to PGND (8A); enables design flexibility without rework. |
| Vsns (6) | OVP and PGood sensing | Monitors output for overvoltage and power-good status; remains active during Enable=low for fault-safe monitoring. |
| FB (7) | Error amplifier inverting input | Connects to output divider or remote sense amplifier; 0.6V reference enables sub-1V core rail regulation. |
| Comp (8) | Error amplifier output | Drives external RC compensation network; 7–20V/µs slew rate supports fast transient recovery. |
| RSo (9) | Remote sense amplifier output | Drives FB node; 3–13mA sourcing capability supports standard feedback dividers with minimal loading error. |
| PGND (10,26,27,29) | Power ground return | Multiple low-inductance connections to PCB ground plane; essential for minimizing switching noise coupling into control circuitry. |
| LGND (11) | Signal reference ground | Isolated from PGND to prevent control-loop contamination from high di/dt power currents. |
| RS− / RS+ (12,13) | Differential remote sense inputs | Connect directly to load ground and output; 45–85kΩ input impedance minimizes current draw and trace sensitivity. |
| Cbyp (14) | VREF bypass capacitor | 100–180pF capacitor to LGND stabilizes 0.6V reference; critical for reference accuracy and PSRR performance. |
| PGD (16) | Open-drain power good output | Asserts low when Vsns is within 95–125% VREF window; pull-up required to VCC for logic-level compatibility. |
| Vin (17) | LDO input supply | Accepts 5–21V; powers internal logic and drivers; must be connected when VCC is externally regulated. |
| VCC/LDO_out (18) | Bias voltage output | Provides 6.3–7.1V (DCM=0) or 4.0–4.8V (DCM=1); minimum 4.7µF bypass cap required for stability. |
| SW (20,21,22,23,24,25,32) | Switch node connection | Paralleled high-current terminals connect to output inductor; low-inductance routing reduces ringing and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MOSFET drivers + bootstrap diode | Eliminates 4 external components per phase; reduces BOM count and layout area in multi-phase designs. |
| Enhanced pre-bias startup | Allows safe start-up into pre-charged output capacitors without reverse current flow or output collapse. |
| Body braking during light-load transients | Activates low-side FET during off-time to sink inductor current; improves load-step response by >30% vs. standard buck. |
| Programmable power good thresholds | Configurable 95% (high) and 90%/115% (low) VREF windows enable custom sequencing margins for multi-rail systems. |
| Post-package trimmed dead-time | Factory-adjusted rising-edge dead-time prevents shoot-through; eliminates need for manual timing calibration in production. |
Applications
| Server Core Voltage Regulation | Distributed Point-of-Load Power |
|---|---|
|
Use Scenario: Regulating 1.2V/16A core voltage for dual-socket Xeon processors in 1U rack servers. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with integrated FETs, remote sensing, and programmable frequency for EMI compliance. Use Value: Reduces solution size by 40% vs. controller+discrete-FET approach; thermal resistance of 15.4°C/W sustains full load at 70°C ambient. |
Use Scenario: Providing isolated 0.85V/12A supply to FPGA I/O banks in telecom baseband cards. IC Role / Device Role / Timing Role: High-accuracy, low-noise point-of-load regulator with differential remote sense to compensate for 50mΩ board trace resistance. Use Value: ±0.5% reference accuracy and <2mV remote sense offset ensure <±10mV output deviation across temperature and load. |
| Set-Top Box SoC Power Delivery | Industrial GPU Accelerator Rails |
|
Use Scenario: Delivering 1.05V/10A to ARM-based multimedia SoC in consumer STB with strict cost and footprint targets. IC Role / Device Role / Timing Role: Single-chip buck solution replacing controller+driver+FET discrete design; supports 600kHz fixed frequency for small magnetics. Use Value: Integrated Smart LDO reduces standby current to 300µA; body braking improves 2A/µs load step recovery by 45%. |
Use Scenario: Powering 0.95V/14A GPU memory interface in ruggedized edge AI inference module operating at -40°C to 85°C. IC Role / Device Role / Timing Role: Industrial-grade buck regulator with -40°C to 125°C junction rating, hiccup-mode OCP, and thermal shutdown. Use Value: Thermally compensated current limit maintains 16A trip point across full temperature range; RoHS/halogen-free PQFN meets IPC-1752 requirements. |
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) | Higher 20A rating but no remote sense; 0.6V reference with ±1% accuracy; requires external bootstrap diode. | Lacks true differential remote sensing and programmable PGOOD thresholds; less suitable for precision load regulation. | Prefer when higher current headroom is needed and board space allows external diode; avoid for <±10mV output tolerance requirements. |
| TPS53689T (Texas Instruments) | 3+1 phase controller with PMBus interface; supports 40A+ with external FETs; 0.5% reference accuracy; no integrated FETs. | Requires external power stage and complex layout; adds PMBus overhead but enables telemetry and dynamic margining. | Choose for scalable multi-phase designs requiring telemetry; not a drop-in replacement due to topology and pinout differences. |
Compared with MP8765GQ-Z and TPS53689T, IR3448MTRPBF uniquely combines integrated 16A FETs, true differential remote sense, and factory-trimmed dead-time in a 5×6mm PQFN-enabling compact, high-accuracy single-phase solutions without external drivers or sensing resistors.
Availability
IR3448MTRPBF is available at Aetrix Electronics and suitable for server power delivery, distributed point-of-load architectures, and set-top box SoC regulation requiring stable component supply, extended temperature support, and lead-free compliance.
Supply support for IR3448MTRPBF 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 certifications including ISO/TS 16949 and IATF 16949.
The SupIRBuck® product line delivers fully integrated DC/DC regulators targeting high-current, low-voltage applications in datacenter, networking, and computing infrastructure where space, efficiency, and reliability are critical.
FAQ
What is the maximum supported input voltage for IR3448MTRPBF?
The absolute maximum PVin rating is 25V, but recommended operating range is 1.5V–21V. Exceeding 21V risks violating the 25V SW-node AC rating (–4V to 25V, 100ns) and may trigger overvoltage protection. For 21V bus applications, ensure input transient suppression limits peak voltage to ≤23V.
How does the OCset pin configure current limit?
OCset (pin 5) selects one of three current-limit thresholds: floating = 16A, tied to VCC = 12A, tied to PGND = 8A. This is implemented via internal resistor ladder and comparator; no external components are needed. The setting affects hiccup-mode OCP trip point and remains active during all operating modes including pre-bias startup.
Can IR3448MTRPBF operate without external VCC bias?
No. IR3448MTRPBF requires either external VCC supply (4.5–7.5V) or use of its internal Smart LDO powered from Vin (5–21V). When using the LDO, Vin must be connected and ≥7.2V for full 6.3–7.1V VCC output; below that, VCC drops to 4.0–4.8V in DCM mode, limiting gate drive strength.
What is the purpose of the LGND pin and how should it be routed?
LGND (pin 11) is the dedicated analog ground for internal references, error amplifier, and control logic. It must be isolated from PGND and connected to a clean signal ground plane. A short, low-impedance trace links LGND to Cbyp (pin 14) and FB (pin 7); mixing LGND with PGND causes reference noise and regulation instability.
IR3448MTRPBF 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)
IR3448MTRPBF FAQ
1.How can I place an order for IR3448MTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3448MTRPBF 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 IR3448MTRPBF reliable?
The price and inventory of IR3448MTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3448MTRPBF is usually 5 days.
3.What payment methods are accepted for IR3448MTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3448MTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3448MTRPBF?
IR3448MTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3448MTRPBF 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 IR3448MTRPBF?
For technical support, including IR3448MTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3448MTRPBF requirements.
6.How does Aetrix verify that IR3448MTRPBF is sourced from the original manufacturer or authorized distributors?
All IR3448MTRPBF 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 IR3448MTRPBF meets industry standards.
7.What is the process for return or replacement of IR3448MTRPBF?
All IR3448MTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3448MTRPBF, 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 IR3448MTRPBF part is unused and in its original packaging.
Return procedure for IR3448MTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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