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Infineon Technologies IR3477MTRPBF
- Part No.:
- IR3477MTRPBF
- Manufacturer:
- Infineon Technologies
- Package:
- 16-PowerVQFN
- Datasheet:
-
IR3477MTRPBF.pdf
- Description:
- IC REG BUCK ADJ 15A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,491
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Product details
Overview
IR3477MTRPBF from Infineon Technologies is a fully integrated 15A synchronous buck regulator with on-die high- and low-side MOSFETs, constant-on-time control, 0.5V ±1% reference accuracy, 3V–27V input range, and 0.5V–12V programmable output. It delivers precision regulation in notebook power rails, GPU core supplies, and POL converters where compact size and light-load efficiency are critical.
For engineers reviewing the IR3477MTRPBF datasheet, IR3477MTRPBF pinout, IR3477MTRPBF application, or IR3477MTRPBF equivalent, key selection factors include thermally compensated overcurrent protection, pre-bias startup capability, FCCM/DCM mode selection via pin voltage, and absence of external loop compensation components.
Technical Context
The IR3477 implements a hysteretic constant-on-time (COT) control architecture that eliminates need for external compensation while maintaining stable operation across wide load and input voltage ranges. Its internal 14.5 mΩ high-side and 6 mΩ low-side MOSFETs enable high-efficiency conversion at 15A continuous output current.
Functional integration includes a dedicated ISET pin for adjustable current-limit threshold, FF pin for feed-forward on-time scaling, and dual-voltage monitoring on EN and FB pins to support input UVLO, output OVP/UVP, and precise power-good assertion at ±1% VREF tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 27V - supports 5V, 12V, and 24V intermediate bus architectures without external level shifting. |
| Output Voltage Range | 0.5V to 12V - set via external resistor divider on FB pin; 0.5V ±1% reference enables sub-1V CPU/GPU core rails. |
| Continuous Output Current | 15A - delivered from single 5mm × 6mm QFN package with integrated MOSFETs and thermal pad. |
| Control Architecture | Constant On-Time (COT) - provides fast transient response and no external compensation required. |
| Reference Accuracy | 0.5V ±1% - ensures tight output regulation across temperature and line/load conditions. |
| Switching Frequency | Programmable up to 750 kHz - adjusted via FF pin resistor; balances efficiency, size, and EMI. |
| Protection Features | Thermally compensated OCP, UVP/OVP on FB, thermal shutdown (125°C), and PGOOD open-drain output. |
Pinout & Package
IR3477MTRPBF is housed in a thermally enhanced 32-pin 5mm × 6mm QFN package with exposed thermal pad (PGND-connected). Pin numbering follows standard QFN convention with Pin 1 marked by dot or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FCCM | Mode Control Input | Pull to 3.3V for forced CCM; ground for DCM/diode emulation - enables efficiency optimization per load condition. |
| 2 ISET | Current Limit Programming | Resistor to PHASE sets overcurrent trip point; thermally compensated for consistent protection across temperature. |
| 3 PGOOD | Open-Drain Status Output | Asserts low when VOUT is within ±7.5mV of target; requires external pull-up for system power sequencing. |
| 4, 17 GND | Analog Ground Reference | Signal return for feedback, soft-start, and enable circuitry - separate from PGND to minimize noise coupling. |
| 5 FB | Feedback Input | Inverting input to comparator; monitors output via resistor divider; enables UVP/OVP detection at ±7.5mV hysteresis. |
| 6 SS | Soft-Start/Shutdown | Capacitor-to-GND sets ramp time; pulled below 0.3V to initiate controlled shutdown. |
| 8 3VCBP | LDO Bypass | Bypass capacitor stabilizes internal 3.3V LDO powering control logic - requires ≥1µF ceramic. |
| 10 VCC | Gate Drive Supply | 5V supply for high-side driver; must be decoupled with ≥1µF ceramic capacitor near pin. |
| 11 PGND | Power Ground Return | High-current return path for MOSFETs and inductor - connects to thermal pad for optimal heat dissipation. |
| 12 PHASE | Switch Node | Connection point between high- and low-side MOSFETs; drives external inductor and boot capacitor. |
| 13 VIN | Main Input Supply | Primary DC input (3–27V); routed separately from VCC to avoid noise injection into gate drive. |
| 14 BOOT | Bootstrap Supply | Connects to PHASE via capacitor; generates floating voltage for high-side MOSFET gate drive. |
| 15 FF | Feed-Forward Input | Resistor to VIN scales on-time inversely with input voltage - improves line regulation and transient response. |
| 16 EN | Enable with Monitoring | Two-resistor divider sets turn-on threshold; internal hysteresis prevents chatter during brown-out events. |
Key Features
| Feature | Design Value |
|---|---|
| No External Compensation Required | COT control architecture eliminates loop compensation components - reduces BOM count and layout sensitivity. |
| Pre-Bias Start-Up | Allows safe startup into pre-charged output capacitors - essential for hot-swap and multi-rail sequencing. |
| Thermally Compensated Overcurrent Protection | ISET-based trip point adjusts with junction temperature - maintains consistent current limit across operating range. |
| Programmable Switching Frequency | FF pin resistor selects frequency from ~200 kHz to 750 kHz - enables optimization of efficiency vs. size vs. EMI. |
| Precision 0.5V Reference | ±1% accuracy over temperature - supports tight-tolerance core rails for modern processors and FPGAs. |
Applications
| GPU Core Power Supply | Notebook Mainboard VRM |
|---|---|
|
Use Scenario: Delivering dynamically scaled 0.7–1.2V core voltage to discrete graphics processing units under heavy compute loads. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with integrated MOSFETs and fast transient response for GPU VDD rail. Use Value: 15A continuous rating and COT control maintain <±1% output regulation during rapid load steps up to 10A/µs. |
Use Scenario: Generating CPU core, SoC, and memory I/O voltages on thin-and-light laptop motherboards with strict height constraints. IC Role / Device Role / Timing Role: Compact, high-efficiency POL regulator replacing multi-chip solutions in space-constrained layouts. Use Value: 5mm × 6mm QFN footprint and no external compensation reduce PCB area by >30% versus discrete controller+driver+MOSFET designs. |
| 12V/24V Distributed Power System | Game Console SoC Power Rail |
|
Use Scenario: Point-of-load conversion from 12V or 24V intermediate bus to 1.8V, 3.3V, or 5V rails in industrial embedded systems. IC Role / Device Role / Timing Role: Self-contained DC/DC regulator supporting wide input range and robust fault handling in unregulated environments. Use Value: Input UVLO (3.9V turn-on), OVP/UVP on FB, and thermal shutdown ensure reliable operation across variable bus conditions. |
Use Scenario: Powering application processors and AI accelerators in next-generation gaming consoles requiring low-noise, high-current rails. IC Role / Device Role / Timing Role: High-accuracy buck regulator with PGOOD signaling for coordinated power sequencing and system-level fault reporting. Use Value: ±1% VREF and ±7.5mV OVP/UVP thresholds enable deterministic power-good assertion for SoC reset management. |
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) | 6A rated, smaller 4mm × 4mm QFN, fixed 500kHz switching, no FCCM/DCM selection pin. | Suitable for lower-current applications (<8A); lacks thermally compensated OCP and pre-bias start-up. | Select when board space is tighter and full 15A capability is unnecessary; verify thermal margin at peak load. |
| TPS546B24RVFT (Texas Instruments) | 15A, PMBus-enabled, 3.5V–18V input, requires external compensation, digital telemetry interface. | Used where telemetry, margining, and dynamic configuration are required - adds firmware overhead. | Choose for systems needing real-time voltage/current/temperature reporting and remote configuration via PMBus. |
Compared with MP8765GQ-Z and TPS546B24RVFT, IR3477MTRPBF offers unique integration of 15A capability, analog COT control without compensation, and pin-selectable conduction modes - making it optimal for cost-sensitive, high-reliability analog POL designs without digital infrastructure.
Availability
IR3477MTRPBF is available at Aetrix Electronics and suitable for notebook VRMs, GPU power supplies, and 12V/24V distributed power systems requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for IR3477MTRPBF 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 certifications including ISO/TS 16949 and AEC-Q100.
The SupIRBuck™ product line delivers highly integrated DC/DC regulators targeting space-constrained, high-efficiency applications in computing, consumer, and industrial markets - emphasizing ease-of-use, reliability, and minimal external component count.
FAQ
What is the recommended input capacitor for IR3477MTRPBF?
A minimum 22µF X5R/X7R ceramic capacitor rated for ≥25V should be placed within 3mm of VIN and PGND pins. Additional bulk capacitance (e.g., 330µF polymer) is recommended at the input to handle high di/dt transients and reduce ripple on the intermediate bus.
How is the overcurrent protection threshold set and calibrated?
OCP threshold is set by connecting a resistor between ISET and PHASE pins. The trip current equals (19µA × RISET) at 25°C, with ±4400 ppm/°C temperature coefficient. Calibration is factory-trimmed; no user adjustment is needed beyond resistor selection per design current requirement.
Does IR3477MTRPBF support negative output voltages?
No. IR3477MTRPBF is a step-down (buck) regulator only and cannot generate negative outputs. Its topology, pinout, and internal MOSFET configuration are designed exclusively for positive-output DC/DC conversion from higher positive input sources.
Can the soft-start time be adjusted independently of output voltage?
Yes. Soft-start time is determined solely by the capacitor value on the SS pin and its internal 10µA charge current (typical). It is independent of output voltage setting or feedback divider ratio - enabling precise ramp control regardless of VOUT configuration.
IR3477MTRPBF 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:
- 15A
- 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)
IR3477MTRPBF FAQ
1.How can I place an order for IR3477MTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3477MTRPBF 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 IR3477MTRPBF reliable?
The price and inventory of IR3477MTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3477MTRPBF is usually 5 days.
3.What payment methods are accepted for IR3477MTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3477MTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3477MTRPBF?
IR3477MTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3477MTRPBF 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 IR3477MTRPBF?
For technical support, including IR3477MTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3477MTRPBF requirements.
6.How does Aetrix verify that IR3477MTRPBF is sourced from the original manufacturer or authorized distributors?
All IR3477MTRPBF 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 IR3477MTRPBF meets industry standards.
7.What is the process for return or replacement of IR3477MTRPBF?
All IR3477MTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3477MTRPBF, 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 IR3477MTRPBF part is unused and in its original packaging.
Return procedure for IR3477MTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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