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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Infineon Technologies IR3475MTR1PBF

Name: IR3475MTR1PBF
Brand: Infineon Technologies
SKU: IR3475MTR1PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IR3475MTR1PBF

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 16-PowerVFQFN

Datasheet:: IR3475MTR1PBF.pdf

Description:: IC REG BUCK ADJ 10A 16QFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

IR3475MTR1PBF from Infineon Technologies is a fully integrated 10A synchronous buck regulator with constant-on-time control, 0.5V ±1% reference, programmable soft-start, and thermally compensated over-current protection. It operates from 3V–27V input, delivers 0.5V–12V output, and integrates high- and low-side MOSFETs in a 4mm × 5mm QFN package for notebook and POL applications.

For engineers reviewing the IR3475MTR1PBF datasheet, IR3475MTR1PBF pinout, IR3475MTR1PBF application, or IR3475MTR1PBF equivalent, key selection criteria include its 10A continuous load capability, FCCM/DCM mode control via pin 1, precision 0.5V feedback reference, power-good open-drain output, and enable input with voltage monitoring threshold (1.1–1.45V).

Technical Context

The IR3475 implements a hysteretic constant-on-time control architecture that eliminates external loop compensation while maintaining stable regulation across wide load and input ranges. Its internal 25mΩ high-side and 13mΩ low-side MOSFETs support up to 10A continuous current with minimal external components.

Functional integration includes a dedicated ISET pin for adjustable over-current trip, FF pin for feed-forward on-time setting, and dual-mode operation (FCCM or diode-emulation DCM) selected by logic level on pin 1. The device features pre-bias startup, thermal shutdown at 125°C, and under/over-voltage fault detection on the FB node.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3V to 27V - supports 5V, 12V, and 24V distributed power rails without external regulators.
Output Voltage Range	0.5V to 12V - set via resistor divider on FB pin; 0.5V ±1% reference enables sub-1V CPU/GPU core supplies.
Continuous Output Current	10A - delivered with integrated MOSFETs; no external power stage required for compact POL designs.
Switching Frequency	Programmable up to 750kHz - adjusted via FF pin resistor; higher frequency enables smaller inductors and output capacitors.
Reference Accuracy	0.5V ±1% - ensures tight output regulation critical for modern SoC and FPGA core voltages.
Thermal Shutdown Threshold	125°C - protects against sustained overload or poor PCB thermal design; 20°C hysteresis prevents chatter.
Power Good Output	Open-drain PGOOD - asserts after soft-start completion and valid VOUT; requires external pull-up for system sequencing.

Pinout & Package

IR3475MTR1PBF is housed in a thermally enhanced 20-pin 4mm × 5mm QFN package with exposed thermal pad (PGND-connected). Pin 1 is marked by a dot; pins are arranged in two rows (10 per side), with GND and PGND pins strategically placed for optimal thermal and EMI performance.

Pin/Terminal	Circuit Role	Design Meaning
1 FCCM	Mode Control Input	Logic-level select: 0V = DCM/diode emulation; 3.3V = forced CCM for low-noise, ripple-sensitive loads.
2 ISET	Current Limit Sense	Resistor-to-PHASE sets over-current threshold; enables precise, temperature-compensated OCP without sense resistor.
3 PGOOD	Open-Drain Status Output	Asserts high when VOUT is within ±5% of target after soft-start; used for power sequencing and fault reporting.
4,17 GND	Analog Ground Reference	Low-noise return for FB, SS, EN, and internal bias circuits; must be separated from PGND in layout.
5 FB	Feedback Input	Inverting input to error amplifier; monitors output via resistor divider; triggers UV/OV faults at 0.37–0.655V.
6 SS	Soft-Start/Shutdown	Capacitor-to-GND sets ramp time; pulled below 0.3V to disable converter with controlled discharge.
8 3VCBP	LDO Bypass	Bypasses internal 3.3V LDO for gate drive; requires 1µF ceramic cap to AGND; series resistor may be needed in shared-ground layouts.
10 VCC	Gate Drive Supply	5V supply for internal drivers; requires ≥1µF ceramic decoupling close to pin for stable switching.
11 PGND	Power Ground Return	High-current return path for low-side MOSFET and output capacitor; connects to thermal pad for heat dissipation.
12 PHASE	Switch Node	Connection point between high- and low-side MOSFETs; drives external inductor; voltage swings from VIN to ~−2V.
13 VIN	Main Input Supply	Primary DC input (3–27V); powers high-side driver and internal circuitry; requires bulk and ceramic input capacitance.
14 BOOT	Bootstrap Supply	Charged via external capacitor to PHASE; provides gate drive voltage >VIN for high-side MOSFET turn-on.
15 FF	Feed-Forward Input	Resistor-to-VIN sets on-time inversely proportional to input voltage; improves line transient response.
16 EN	Enable with Monitoring	Turns device on/off; threshold set by external resistive divider; monitors input rail for brown-in/out protection.

Key Features

Feature	Design Value
No external compensation required	Constant-on-time hysteretic control eliminates loop stability analysis and saves board space.
Pre-bias start-up	Allows safe startup into pre-charged output capacitors without reverse current or latch-up.
Thermally compensated over-current protection	ISET pin uses internal temperature coefficient (4400 ppm/°C) to maintain consistent current limit across operating range.
Programmable soft-start	SS pin capacitor value directly sets output ramp time, preventing inrush current and bus droop.
Power good with UV/OV fault detection	PGOOD deasserts during FB voltage deviation beyond ±5%, enabling reliable system-level fault handling.

Applications

Notebook Core Voltage Regulation

Desktop GPU Power Delivery

Use Scenario: Regulating 0.85V/8A core supply for Intel Core i7 or AMD Ryzen mobile processors in thin-and-light notebooks.

IC Role / Device Role / Timing Role: Primary synchronous buck controller with integrated power stage, managing dynamic load transients and deep-sleep state transitions.

Use Value: Eliminates need for external MOSFET drivers and compensation network, reducing BOM count by ≥4 components and PCB area by >30%.

Use Scenario: Delivering 1.05V/10A to discrete graphics cards in gaming desktops with strict ripple and transient response requirements.

IC Role / Device Role / Timing Role: High-current POL regulator with FCCM mode enabled to suppress audible noise and minimize output voltage undershoot during 5A/µs load steps.

Use Value: Achieves <15mV undershoot at 10A step using only 1.5µH inductor and 330µF output capacitance due to fast constant-on-time response.

12V Distributed Power System

STB/Smart TV SoC Supply

Use Scenario: Converting 12V intermediate bus to 3.3V/5A for FPGA I/O banks and memory interfaces in industrial edge compute modules.

IC Role / Device Role / Timing Role: Secondary buck regulator with enable input configured for rail sequencing and brown-out detection on 12V input.

Use Value: EN pin's 1.25V threshold and 400mV hysteresis provide robust immunity to 12V rail noise while ensuring clean power-up order.

Use Scenario: Generating 1.1V/6A core voltage for ARM-based media SoCs in set-top boxes and smart TVs operating from 24V wall adapters.

IC Role / Device Role / Timing Role: Main SoC power supply with pre-bias startup and thermal shutdown, supporting hot-plug and ambient temperatures up to 85°C.

Use Value: Integrated 13mΩ/25mΩ MOSFETs deliver >92% efficiency at 6A/1.1V, reducing heatsink requirements and enabling fanless enclosure 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)	6A rated, 2.5V–18V input, requires external compensation, no FCCM pin	Limited to lower-current applications; lacks programmable mode control and thermal OCP compensation	Select when cost sensitivity outweighs current headroom and advanced protection features.
TPS546B24RVFT (TI)	15A rated, 3.5V–18V input, PMBus interface, external VBST capacitor required	Supports digital telemetry and dynamic voltage scaling but adds firmware complexity and layout overhead	Select when system-level monitoring, margining, or multi-rail coordination is required.

Compared with MP8765GQ-Z and TPS546B24RVFT, IR3475MTR1PBF offers the optimal balance of 10A integration, analog simplicity, and adaptive protection-ideal for cost-constrained, space-limited, and thermally demanding embedded power designs where digital control adds unnecessary complexity.

Availability

IR3475MTR1PBF is available at Aetrix Electronics and suitable for notebook core regulation, GPU power delivery, and 12V distributed power systems requiring stable component supply, long-term manufacturability, and qualified industrial-grade reliability.

Supply support for IR3475MTR1PBF 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 leader 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 point-of-load applications in computing, consumer, and industrial markets-designed to replace multi-component discrete buck solutions with single-package reliability.

FAQ

What is the recommended input capacitor configuration for IR3475MTR1PBF?

A minimum 1µF ceramic capacitor must be placed adjacent to the VCC pin. For VIN, use a combination of bulk electrolytic (e.g., 330µF) and high-frequency ceramic (e.g., 10×1µF X5R/X7R) capacitors near the VIN and PGND pins. Total input capacitance should exceed 470µF with ESR < 10mΩ to handle 10A load steps and reduce input ripple below 50mVpp.

How is over-current protection configured and calibrated?

OCP is set by connecting a resistor between ISET (pin 2) and PHASE (pin 12). The trip current is calculated as I_trip = 19µA × R_ISET, where 19µA is the nominal ISET output current at 25°C. The device automatically compensates for temperature drift using a 4400 ppm/°C coefficient, maintaining accuracy from −40°C to +125°C without calibration.

Can IR3475MTR1PBF operate with an output voltage below 0.5V?

No. The internal reference is fixed at 0.5V ±1%, and the FB pin is designed to regulate precisely to this voltage. Output voltages below 0.5V are not supported. For sub-0.5V applications, an external reference or different controller architecture is required. The lowest achievable output is 0.495V under worst-case tolerance conditions.

What layout guidance is critical for thermal performance?

Maximize copper area connected to the exposed thermal pad (pins 4, 11, 17) using ≥4 thermal vias (0.3mm diameter) to inner ground planes. Separate AGND (pins 4, 17) and PGND (pin 11) traces; connect them at a single point near the IC. Route PHASE, BOOT, and VIN with short, wide traces to minimize parasitic inductance and switching losses.

IR3475MTR1PBF Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: SupIRBuck®

Package/Case:: 16-PowerVFQFN

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:: 10A

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 (4x5)

IR3475MTR1PBF FAQ

1.How can I place an order for IR3475MTR1PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IR3475MTR1PBF 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 IR3475MTR1PBF reliable?

The price and inventory of IR3475MTR1PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3475MTR1PBF is usually 5 days.

3.What payment methods are accepted for IR3475MTR1PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3475MTR1PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IR3475MTR1PBF?

IR3475MTR1PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IR3475MTR1PBF 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 IR3475MTR1PBF?

For technical support, including IR3475MTR1PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3475MTR1PBF requirements.

6.How does Aetrix verify that IR3475MTR1PBF is sourced from the original manufacturer or authorized distributors?

All IR3475MTR1PBF 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 IR3475MTR1PBF meets industry standards.

7.What is the process for return or replacement of IR3475MTR1PBF?

All IR3475MTR1PBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3475MTR1PBF, 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 IR3475MTR1PBF part is unused and in its original packaging.

Return procedure for IR3475MTR1PBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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