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Infineon Technologies IR3476MTRPBF
- Part No.:
- IR3476MTRPBF
- Manufacturer:
- Infineon Technologies
- Package:
- 16-PowerVQFN
- Datasheet:
-
IR3476MTRPBF.pdf
- Description:
- IC REG BUCK ADJ 12A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,599
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Product details
Overview
IR3476MTRPBF from Infineon Technologies is a fully integrated 12A synchronous buck regulator with on-die high- and low-side MOSFETs, constant-on-time (COT) control, 0.5V ±1% reference, and programmable switching frequency up to 750 kHz. It operates from 3V–27V input, delivers 0.5V–12V output, and supports pre-bias startup, FCCM mode, and thermally compensated overcurrent protection - deployed in notebook VRMs and graphics card POL supplies.
For engineers reviewing the IR3476MTRPBF datasheet, IR3476MTRPBF pinout, IR3476MTRPBF application, or IR3476MTRPBF equivalent, key selection criteria include its integrated 20 mΩ/10 mΩ MOSFETs, 8 µA dynamic VCC supply current at 300 kHz, ±1% VREF accuracy, and dual voltage monitoring via EN and FB pins for system-level fault detection.
Technical Context
The IR3476 implements a hysteretic constant-on-time control architecture that eliminates external loop compensation while maintaining tight transient response across load steps from 0 A to 12 A. Its internal gate drivers support bootstrapped high-side FET operation with 300 mV PFET forward voltage and 5–30 ns deadtime monitoring.
Protection functions are tightly coupled to physical sensing: ISET pin current (19 µA typ.) sets OCP threshold via external resistor-to-PHASE connection; FB pin monitors both output voltage (0.5 V nominal) and provides under/over-voltage fault detection with 7.5 mV hysteresis; thermal shutdown triggers at 125°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 27 V - supports 12 V and 24 V distributed power rails without external step-down pre-regulation. |
| Output Current | 12 A continuous - enables single-chip CPU/GPU core rail delivery without parallel phase stacking. |
| Voltage Reference | 0.5 V ±1% - ensures ±6 mV absolute output tolerance at 1.05 V setting, critical for modern SoC core regulation. |
| Switching Frequency | Programmable up to 750 kHz - allows optimization of inductor size vs. light-load efficiency in portable systems. |
| MOSFET RDS(on) | High-side: 25 mΩ max; Low-side: 12.5 mΩ max - minimizes conduction loss at full 12 A load, enabling >90% peak efficiency. |
| Soft-Start Control | Capacitor-programmable via SS pin - provides controlled ramp-up to prevent inrush current in multi-rail systems. |
| Power Good Output | Open-drain PGOOD with 1 V delay threshold - synchronizes downstream logic enable after stable VOUT is confirmed. |
Pinout & Package
IR3476MTRPBF uses a thermally enhanced 5 mm × 6 mm QFN-17 package with exposed thermal pad (PGND-connected), optimized for high-current DC/DC conversion in space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FCCM | Mode control input | Pull to 3.3 V for forced CCM; ground for DCM/diode emulation - selects conduction mode based on light-load efficiency vs. noise requirements. |
| 2 ISET | Overcurrent sense node | Resistor-to-PHASE sets trip point - enables precise current limiting independent of temperature drift (4400 ppm/°C coefficient). |
| 3 PGOOD | Open-drain status output | Asserts low when VOUT deviates >±15% from 0.5 V reference - used for system sequencing and fault flagging. |
| 4, 17 GND | Analog ground reference | Separate bias return path for feedback and control circuitry - prevents noise coupling into sensitive VFB node. |
| 5 FB | Inverting feedback input | Monitors output via resistive divider - also serves as UV/OV fault detector with 0.4 V / 0.625 V thresholds. |
| 6 SS | Soft-start timing node | Capacitor-to-GND sets rise time - avoids input capacitor stress and enables graceful power-up in multi-rail systems. |
| 8 3VCBP | LDO bypass terminal | Requires 1 µF ceramic cap to GND - stabilizes internal 3.3 V LDO powering control logic and comparators. |
| 10 VCC | Gate drive supply input | Must be ≥4.5 V; min. 1 µF ceramic decoupling required - powers high-side driver and bootstrap circuitry. |
| 11 PGND | Power ground return | High-current return path for low-side FET and output inductor - must be tied to thermal pad for thermal performance. |
| 12 PHASE | Switching node | Connects to inductor and external bootstrap capacitor - experiences full VIN swing; rated for −5 V transient (100 ns). |
| 13 VIN | Main input supply | Accepts 3–27 V; feeds high-side FET source and internal LDO - requires bulk and ceramic input capacitance. |
| 14 BOOT | Bootstrap supply | Capacitor between BOOT and PHASE generates floating gate drive voltage - enables N-channel high-side FET operation. |
| 15 FF | Feed-forward input | Resistor-to-VIN sets on-time - improves line regulation and enables adaptive frequency scaling with input voltage. |
| 16 EN | Enable with voltage monitor | Two-resistor divider sets turn-on threshold (1.25 V typ.); monitors input rail health before activation. |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Constant-on-time hysteretic control eliminates type-II/type-III compensation network - reduces BOM count and layout sensitivity. |
| Thermally compensated overcurrent protection | ISET pin current tracks junction temperature (4400 ppm/°C) - maintains consistent current limit across −40°C to 125°C operating range. |
| Pre-bias start-up capability | Allows safe startup into pre-charged output capacitors - prevents reverse current flow and protects downstream loads during hot-insertion. |
| Forced Continuous Conduction Mode (FCCM) | FCCM pin enables fixed-frequency operation down to zero load - eliminates audible noise and simplifies EMI filtering in noise-sensitive applications. |
| Precision 0.5 V reference with ±1% tolerance | Enables accurate 1.05 V, 1.2 V, or 1.8 V outputs using standard 1% resistors - eliminates need for trimming or calibration in production. |
Applications
| Notebook CPU Core Regulator | Graphics Card GPU Rail |
|---|---|
|
Use Scenario: Powers Intel/AMD mobile processor cores requiring dynamically scaled 0.7–1.4 V at up to 12 A peak current. IC Role / Device Role / Timing Role: Primary POL regulator delivering tightly regulated core voltage with <10 µs transient response to DVFS events. Use Value: Integrated MOSFETs and COT control reduce solution size by 35% vs. controller+discrete-FET alternatives while maintaining ±1% output accuracy. |
Use Scenario: Supplies NVIDIA/AMD discrete GPU memory and logic rails in gaming laptops and desktop add-in cards. IC Role / Device Role / Timing Role: High-current buck stage supporting rapid load transients during shader execution and memory burst access. Use Value: 12 A capability and FCCM mode ensure stable rail delivery during 0→10 A load steps without mode-hopping-induced ripple. |
| STB/Smart TV SoC Power | Industrial 24 V POL Converter |
|
Use Scenario: Powers ARM-based media SoCs in set-top boxes and smart TVs with strict standby power (<30 µA) and fast wake-up requirements. IC Role / Device Role / Timing Role: Main SoC core regulator with pre-bias startup and ultra-low quiescent current (23 µA standby). Use Value: Enables sub-100 mW no-load power consumption and seamless resume-from-sleep without output droop or resequencing delays. |
Use Scenario: Converts 24 V industrial bus to 3.3 V/5 V for PLC I/O modules and sensor interface circuits operating in harsh thermal environments. IC Role / Device Role / Timing Role: Robust POL regulator with thermal shutdown (125°C trigger) and wide-input operation (3–27 V). Use Value: Eliminates need for external heat sinks in enclosed enclosures due to low RDS(on) and exposed thermal pad design. |
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) | 6 A rated, 2.5 V–18 V input, requires external compensation, no FCCM mode | Limited to lower-current SoC rails; lacks thermally compensated OCP and pre-bias startup | Choose for cost-sensitive, <6 A applications where board space permits external compensation components. |
| TPS546D24 (Texas Instruments) | 15 A rated, 3.5 V–18 V input, PMBus interface, requires external MOSFETs | Supports digital telemetry and multi-phase synchronization but increases BOM and layout complexity | Choose when remote monitoring, margining, or phase interleaving is required in server or telecom systems. |
Compared with MP8765GQ-Z and TPS546D24, IR3476MTRPBF uniquely integrates 12 A MOSFETs, eliminates compensation, and delivers pre-bias startup and FCCM in a compact QFN - making it optimal for analog-controlled, space-constrained, high-transient POL designs.
Availability
IR3476MTRPBF is available at Aetrix Electronics and suitable for notebook VRMs, graphics card GPU rails, STB SoC power, and industrial 24 V POL converters requiring stable component supply, long-lifecycle support, and lead-free compliance.
Supply support for IR3476MTRPBF 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 ICs, and industrial control solutions, with global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.
The SupIRBuck™ product line delivers highly integrated DC/DC regulators targeting high-efficiency, low-noise, and minimal-footprint point-of-load conversion for computing, consumer, and industrial applications.
FAQ
What is the maximum allowable voltage on the PHASE pin?
The PHASE pin supports DC voltages up to 30 V but tolerates only −5 V for pulses shorter than 100 ns. Exceeding these limits risks permanent damage to the internal high-side MOSFET or gate driver. Layout best practices require short, low-inductance routing between PHASE, BOOT, and the external bootstrap capacitor to suppress ringing.
How is the overcurrent threshold set and temperature-compensated?
The overcurrent threshold is set by connecting a resistor between ISET and PHASE pins; the resulting current (19 µA typical at 25°C) scales linearly with temperature at +4400 ppm/°C. This inherent coefficient ensures the trip point rises proportionally with junction temperature, maintaining consistent current limiting across −40°C to 125°C without external sensors or compensation circuitry.
Can IR3476MTRPBF operate with an output voltage below 0.5 V?
No - the internal reference is fixed at 0.5 V ±1%, and the FB pin is designed as the inverting input of a comparator referenced to this value. Output voltages below 0.5 V cannot be regulated; the minimum valid output is 0.5 V, achieved with a direct FB-to-VOUT connection and no resistive divider.
What is the purpose of the FF (feed-forward) pin and how is it configured?
The FF pin connects via a resistor to VIN to adjust on-time inversely with input voltage, improving line regulation and enabling adaptive frequency scaling. With RFF = 180 kΩ, typical on-time is 300 ns; increasing RFF extends on-time and lowers switching frequency, while decreasing it raises frequency - allowing optimization for efficiency or EMI in varying input conditions.
IR3476MTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- SupIRBuck®
- Package/Case:
- 16-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):
- 3V
- Voltage - Input (Max):
- 27V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 12V
- Current - Output:
- 12A
- Frequency - Switching:
- Up to 750kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (5x6)
IR3476MTRPBF FAQ
1.How can I place an order for IR3476MTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3476MTRPBF 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 IR3476MTRPBF reliable?
The price and inventory of IR3476MTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3476MTRPBF is usually 5 days.
3.What payment methods are accepted for IR3476MTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3476MTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3476MTRPBF?
IR3476MTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3476MTRPBF 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 IR3476MTRPBF?
For technical support, including IR3476MTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3476MTRPBF requirements.
6.How does Aetrix verify that IR3476MTRPBF is sourced from the original manufacturer or authorized distributors?
All IR3476MTRPBF 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 IR3476MTRPBF meets industry standards.
7.What is the process for return or replacement of IR3476MTRPBF?
All IR3476MTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3476MTRPBF, 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 IR3476MTRPBF part is unused and in its original packaging.
Return procedure for IR3476MTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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