Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Infineon Technologies IR3477MTR1PBF

Name: IR3477MTR1PBF
Brand: Infineon Technologies
SKU: IR3477MTR1PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: IR3477MTR1PBF

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 16-PowerVQFN

Datasheet:: IR3477MTR1PBF.pdf

Description:: IC REG BUCK ADJ 15A 16QFN

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,458

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

IR3477MTR1PBF from Infineon Technologies is a highly integrated 15A synchronous buck DC/DC regulator with on-die high- and low-side MOSFETs, constant-on-time control, 0.5V ±1% reference, programmable switching frequency up to 750 kHz, and thermally compensated over-current protection. It delivers precise regulation from 3V–27V input to 0.5V–12V output in a compact 5mm × 6mm QFN package, targeting point-of-load conversion in notebook power rails.

For engineers reviewing the IR3477MTR1PBF datasheet, IR3477MTR1PBF pinout, IR3477MTR1PBF application, or IR3477MTR1PBF equivalent, key selection factors include its FCCM/DCM mode selectability via pin 1, ISET-based current limit programming, PGOOD open-drain signaling, pre-bias startup capability, and VCC under-voltage lockout with 300 mV hysteresis.

Technical Context

The IR3477 implements a constant-on-time (COT) hysteretic control architecture that eliminates external loop compensation while maintaining fast transient response across load steps. Its internal gate drivers support bootstrapped high-side FET operation and integrate deadtime control (5–30 ns) to prevent shoot-through.

Thermal compensation of over-current protection uses the ISET pin's temperature coefficient (4400 ppm/°C) to scale trip threshold with junction temperature. The device supports both forced continuous conduction mode (FCCM) and diode-emulation DCM via the FCCM pin, enabling efficiency optimization across light-to-heavy loads.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3V to 27V - supports wide-input industrial and battery-powered systems including 12V/24V distributed supplies.
Output Voltage Range	0.5V to 12V - enables core voltage regulation for CPUs, GPUs, and SoCs with tight tolerance (±1% at 0.5V).
Continuous Output Current	15A - delivered via integrated 14.5 mΩ/6 mΩ (HS/LS) MOSFETs, eliminating external power stage design effort.
Switching Frequency	Programmable up to 750 kHz - set via FF pin resistor; higher frequencies reduce output filter size but increase switching loss.
Reference Voltage Accuracy	0.5V ±1% - ensures stable feedback loop performance without external trimming or calibration.
Soft-Start Control	Capacitor-programmable via SS pin - prevents inrush current during power-up; shutdown achieved by pulling SS < 0.3V.
Power Good Output	Open-drain PGOOD with 25–50 Ω pull-down - signals valid regulation after soft-start and fault-free operation.
Enable Threshold	1.1–1.45 V rising edge with 400 mV hysteresis - allows precise input voltage monitoring for system sequencing.

Pinout & Package

IR3477MTR1PBF is housed in a thermally enhanced 5mm × 6mm QFN package with exposed thermal pad (PGND-connected), 0.5 mm pitch, and 28-pin layout. Pin 1 is marked with a dot; the package supports reflow soldering per JEDEC Level 2 moisture sensitivity.

Pin/Terminal	Circuit Role	Design Meaning
1 FCCM	Mode Select Input	3.3V logic level: forces CCM; grounded: enables DCM/diode emulation for light-load efficiency.
2 ISET	Current Limit Programming	Connects to PHASE through resistor to set over-current trip point; temperature-compensated (4400 ppm/°C).
3 PGOOD	Open-Drain Status Output	Asserts low when output is within ±7.5 mV of target; requires external pull-up to 3.3V.
4,17 GND	Analog Ground Reference	Signal return for FB, SS, EN, and internal bias circuits; must be separated from PGND in layout.
5 FB	Feedback Input	Inverting input to PWM comparator; monitors output via resistive divider; senses OVP/UVP faults.
6 SS	Soft-Start/Shutdown	Capacitor-to-GND sets ramp time; pulled <0.3V to disable converter with controlled discharge.
8 3VCBP	LDO Bypass	Bypasses internal 3.3V LDO for gate drive bias; requires 1 µF ceramic capacitor to GND.
10 VCC	Gate Drive Supply	5V supply for internal drivers; minimum 1 µF ceramic decoupling required at pin.
11 PGND	Power Ground Return	High-current return path for lower MOSFET and output capacitor; connects to thermal pad.
12 PHASE	Switch Node	Connection between HS and LS FETs; drives external bootstrap capacitor and senses DCM comparator offset.
13 VIN	Main Input Supply	Primary power input (3–27V); feeds upper FET source and internal LDO; requires local bulk capacitance.
14 BOOT	Bootstrap Supply	Connects to PHASE via capacitor to generate gate drive voltage > VIN for upper FET.
15 FF	Feed-Forward Input	Resistor-to-VIN sets on-time; improves line regulation and enables frequency programming.
16 EN	Enable with Monitoring	Turns device on/off; two-resistor divider sets turn-on threshold (1.1–1.45 V) with 400 mV hysteresis.

Key Features

Feature	Design Value
No external compensation required	Constant-on-time control eliminates need for type-II/type-III compensation network, reducing BOM count and layout sensitivity.
Pre-bias start-up support	Allows safe startup into pre-charged output capacitors without reverse current flow or output collapse.
Thermally compensated OCP	ISET pin current scales with temperature (4400 ppm/°C), maintaining consistent current limit across -40°C to +125°C junction range.
Programmable FCCM/DCM mode	FCCM pin selects conduction mode: CCM ensures fixed frequency and low noise; DCM improves light-load efficiency.
Precision 0.5V reference	0.5V ±1% internal reference enables accurate low-VOUT regulation (e.g., 1.05V @ ±1%) without external DAC or trimming.
Integrated dual MOSFET power stage	On-die 14.5 mΩ HS / 6 mΩ LS FETs deliver 15A continuous current with minimal external components and thermal footprint.

Applications

Notebook CPU Core Power

Graphics Card Memory Rail

Use Scenario: Regulating 1.05V core voltage for Intel/AMD mobile processors under dynamic load transients up to 15A.

IC Role / Device Role / Timing Role: Primary synchronous buck regulator with COT control delivering fast transient response and PGOOD sequencing signal.

Use Value: Pre-bias startup avoids output collapse during hot-plug; FCCM mode ensures stable frequency during GPU boost loads.

Use Scenario: Supplying 1.2V/1.35V GDDR6 memory rails in gaming laptops and embedded graphics modules.

IC Role / Device Role / Timing Role: High-current POL regulator with programmable soft-start to coordinate with GPU power sequencing.

Use Value: 0.5V ±1% reference enables tight VDDQ tolerance; thermally compensated OCP protects against localized hotspots near memory ICs.

12V/24V Industrial POL Converter

STB & Smart TV SoC Power

Use Scenario: Converting 12V or 24V intermediate bus to 3.3V/5V for FPGA I/O banks or microcontroller peripherals.

IC Role / Device Role / Timing Role: Fully integrated buck converter replacing discrete controller + DrMOS solutions in space-constrained enclosures.

Use Value: 5mm × 6mm QFN package reduces PCB area vs. multi-chip alternatives; EN pin voltage monitoring enables brown-out detection.

Use Scenario: Generating 1.1V SoC core voltage and 1.8V DDR interface rail in set-top boxes and smart TVs with thermal constraints.

IC Role / Device Role / Timing Role: Dual-rail capable regulator (via multiple units) with independent enable and PGOOD for system-level power management.

Use Value: DCM mode extends battery life in standby; under/over-voltage fault protection prevents SoC latch-up during input surges.

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)	12A rated, 2.5–18V input, 0.6–5.5V output, requires external compensation, no FCCM pin.	Lacks programmable conduction mode and integrated thermal OCP compensation; smaller package (4mm × 4mm).	Select when lower current (≤12A) and smaller footprint outweigh need for DCM optimization and thermal robustness.
RTQ2132BGQW (Richtek)	15A rated, 3–28V input, 0.6–5.5V output, COT control, no ISET-based OCP, fixed 500 kHz FS.	Missing ISET programmability and FCCM/DCM selectability; includes spread-spectrum clocking for EMI reduction.	Choose when EMI compliance is critical and fixed-frequency operation is acceptable for system timing budget.

Compared with MP8765GQ-Z and RTQ2132BGQW, IR3477MTR1PBF uniquely combines 15A capability, thermal OCP compensation, and pin-selectable FCCM/DCM-enabling optimal efficiency across full load range without sacrificing transient performance or sequencing control.

Availability

IR3477MTR1PBF is available at Aetrix Electronics and suitable for notebook CPU core power, graphics card memory rails, and 12V/24V industrial POL converters requiring stable component supply, long-term lifecycle support, and qualified MSL2 packaging.

Supply support for IR3477MTR1PBF 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 electronics, and industrial control ICs, with global manufacturing and qualification standards aligned to AEC-Q100 and IATF 16949.

The SupIRBuck™ product line delivers fully integrated, high-current DC/DC regulators targeting space-constrained, thermally demanding applications in computing, consumer, and industrial markets-emphasizing ease-of-use, reliability, and minimal external component count.

FAQ

What is the recommended layout practice for the thermal pad of IR3477MTR1PBF?

The exposed thermal pad (Pin 11 PGND) must be soldered to a solid copper pour connected to the main PGND plane using ≥4 thermal vias (0.3 mm diameter, spaced ≤1 mm apart). Avoid splitting the pad or routing signals underneath it. Thermal relief connections to inner layers are not permitted-full copper connection ensures junction temperature stays below 125°C at 15A.

Can IR3477MTR1PBF operate with a 2.5V input supply?

No. The absolute minimum input voltage is 3V per the Absolute Maximum Ratings table, and the Recommended Operating Conditions specify 3V–27V. Operation below 3V risks failure to initiate switching, improper gate drive, or undervoltage lockout activation due to insufficient VCC bootstrap margin and internal LDO headroom.

How is the over-current protection threshold calculated using the ISET pin?

The ISET pin sources a temperature-compensated current (19 µA typical at 25°C, +4400 ppm/°C) into an external resistor tied to the PHASE node. The resulting voltage drop across the resistor sets the current-limit threshold: I_LIM ≈ (V_PHASE − V_ISET) / R_ISET. Typical design uses 10 kΩ for ~15A trip with appropriate derating for temperature rise.

Does IR3477MTR1PBF support output voltages below 0.5V?

No. The internal reference is fixed at 0.5V ±1%, and the FB pin is designed for inverting configuration with this reference. Attempting to regulate below 0.5V violates the electrical specification and results in loss of regulation accuracy, unstable PGOOD assertion, and potential violation of the ±7.5 mV UVP/OVP hysteresis window.

IR3477MTR1PBF 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)

IR3477MTR1PBF FAQ

1.How can I place an order for IR3477MTR1PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IR3477MTR1PBF 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 IR3477MTR1PBF reliable?

The price and inventory of IR3477MTR1PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3477MTR1PBF is usually 5 days.

3.What payment methods are accepted for IR3477MTR1PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3477MTR1PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IR3477MTR1PBF?

IR3477MTR1PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IR3477MTR1PBF 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 IR3477MTR1PBF?

For technical support, including IR3477MTR1PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3477MTR1PBF requirements.

6.How does Aetrix verify that IR3477MTR1PBF is sourced from the original manufacturer or authorized distributors?

All IR3477MTR1PBF 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 IR3477MTR1PBF meets industry standards.

7.What is the process for return or replacement of IR3477MTR1PBF?

All IR3477MTR1PBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3477MTR1PBF, 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 IR3477MTR1PBF part is unused and in its original packaging.

Return procedure for IR3477MTR1PBF:

1.Submit a request within 90 days.

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

Tech Hub

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…

2026-07-17 Raspberry Pi Alternatives: Chip-Level Comparison, Compatibility and Replacement Guide

Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…