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

Infineon Technologies IR3473MTR1PBF

Name: IR3473MTR1PBF
Brand: Infineon Technologies
SKU: IR3473MTR1PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IR3473MTR1PBF

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 16-PowerVFQFN

Datasheet:: IR3473MTR1PBF.pdf

Description:: IC REG BUCK ADJ 6A 16QFN

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Product details

Overview

IR3473MTR1PBF from Infineon Technologies is a fully integrated 6A synchronous buck regulator with on-die high- and low-side MOSFETs, constant-on-time control, 0.5V ±1% reference accuracy, and programmable switching frequency up to 750 kHz. It operates from 3V–27V input and delivers 0.5V–12V output, supporting pre-bias startup and forced CCM mode in notebook power rails and POL converters.

For engineers reviewing the IR3473MTR1PBF datasheet, IR3473MTR1PBF pinout, IR3473MTR1PBF application, or IR3473MTR1PBF equivalent, key selection criteria include thermally compensated over-current protection, power-good open-drain output, enable input with voltage monitoring, soft-start programmability via external capacitor, and 4mm × 5mm QFN thermal performance in space-constrained DC/DC designs.

Technical Context

The IR3473 implements a constant-on-time (COT) hysteretic control architecture that eliminates loop compensation components while maintaining fast transient response across load steps. Its internal 25 mΩ upper and 24 mΩ lower MOSFETs support continuous 6A output with minimal external components.

Functional integration includes a precision 0.5V feedback reference, programmable soft-start via SS pin capacitor, thermally compensated current limit set by ISET-to-PHASE resistor, and dual UV/OV fault detection on FB with 7.5 mV hysteresis - enabling robust operation in battery-powered and distributed power systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3V to 27V - supports wide-input industrial and computing rails including 12V/24V bus systems.
Output Voltage Range	0.5V to 12V - enables core voltage regulation for CPUs, GPUs, and SoCs with tight tolerance requirements.
Continuous Output Current	6A - delivered without external MOSFETs due to integrated high- and low-side FETs (25/24 mΩ @ 5V).
Reference Accuracy	0.5V ±1% - ensures ±5 mV absolute output error at 0.5V setting, critical for low-voltage logic rails.
Switching Frequency	Programmable up to 750 kHz - adjustable via FF pin resistor; balances efficiency, size, and EMI in compact layouts.
Soft-Start Control	Capacitor-programmable on SS pin - prevents inrush current during power-up in sensitive digital loads.
Protection Features	Thermally compensated OCP, UV/OV on FB, thermal shutdown (125°C), PGOOD open-drain output - enables autonomous fault handling without controller intervention.

Pinout & Package

IR3473MTR1PBF is housed in a thermally enhanced 4mm × 5mm QFN package with exposed thermal pad (PGND-connected), optimized for high-current density and low junction-to-board thermal resistance.

Pin/Terminal	Circuit Role	Design Meaning
1 FCCM	Mode control input	Pull to 3.3V for forced CCM; ground for DCM/diode emulation - selects conduction mode based on light-load efficiency needs.
2 ISET	Current limit programming	Resistor to PHASE sets over-current threshold - enables precise, temperature-stable current limiting without sense resistors.
3 PGOOD	Open-drain status output	Asserts low when VOUT is within ±5% of target - used for sequencing and system-level power-good handshaking.
4, 17 GND	Analog ground reference	Signal return for FB, SS, EN - must be separated from PGND in layout to avoid noise coupling into feedback path.
5 FB	Feedback input	Inverting input to comparator; monitors output via resistor divider - sets regulated VOUT = 0.5V × (1 + R1/R2).
6 SS	Soft-start/shutdown	Capacitor to GND sets ramp time; pulled below 0.3V to disable converter - provides controlled startup and fault-initiated shutdown.
8 3VCBP	LDO bypass	Bypass capacitor stabilizes internal 3.3V LDO - required for stable gate drive and analog circuitry operation.
10 VCC	Gate drive supply	5V input powering high-side driver and logic - requires ≥1 µF ceramic decoupling close to pin.
11 PGND	Power ground return	High-current return for low-side FET and output capacitor - connects to thermal pad for optimal heat dissipation.
12 PHASE	Switch node	Connection point between high- and low-side FETs - routes high dv/dt switching waveform; requires tight layout to minimize EMI.
13 VIN	Main input supply	Primary power source (3–27V); feeds high-side FET and bootstrap circuit - requires local bulk and ceramic input capacitors.
14 BOOT	Bootstrap supply	Capacitor to PHASE generates floating gate drive voltage for high-side FET - enables N-channel high-side switch without external charge pump.
15 FF	Feed-forward input	Resistor to VIN sets on-time inversely proportional to input voltage - maintains constant frequency and improves line regulation.
16 EN	Enable with monitoring	Two-resistor divider sets turn-on threshold (1.25V typ); monitors input rail health before enabling regulation.

Key Features

Feature	Design Value
No external compensation required	Constant-on-time control eliminates need for type-II/type-III compensation network - reduces BOM count and design iteration time.
Thermally compensated over-current protection	ISET pin current drift <4400 ppm/°C - maintains consistent current limit across -40°C to +125°C ambient without calibration.
Pre-bias start-up capability	Regulator starts safely into pre-charged output - avoids reverse current flow and protects downstream loads during hot-insertion or multi-rail sequencing.
Power-good output with UV/OV detection	PGOOD asserts only when FB voltage is within 0.495–0.505V (±1%) and remains valid during line/load transients - enables reliable system power sequencing.
Forced CCM mode option	FCCM pin allows fixed-frequency operation down to zero load - eliminates audible noise and improves light-load regulation in always-on subsystems.

Applications

Notebook CPU Core Power

Graphics Card VRM

Use Scenario: Regulating 0.85V–1.3V core voltage for Intel/AMD mobile processors under dynamic load from 0.1A to 6A.

IC Role / Device Role / Timing Role: Primary synchronous buck controller with integrated FETs, delivering tightly regulated core rail with <1% output error.

Use Value: Eliminates external MOSFET drivers and compensation components, reducing PCB area by >30% versus discrete solutions while maintaining <10 µs transient response.

Use Scenario: Supplying GPU memory I/O voltage (1.35V DDR4) and analog rail (1.05V) in gaming laptops with strict thermal limits.

IC Role / Device Role / Timing Role: High-efficiency POL regulator operating at 500 kHz with forced CCM to suppress ripple-induced pixel noise in display subsystems.

Use Value: Integrated 24/25 mΩ FETs achieve >90% peak efficiency at 4A, reducing thermal footprint versus dual-MOSFET + controller alternatives.

12V Distributed Power System

STB/Smart TV SoC Power

Use Scenario: Converting 12V intermediate bus to 3.3V/5V rails for FPGA I/O banks and peripheral interfaces in industrial gateways.

IC Role / Device Role / Timing Role: Self-contained buck stage with PGOOD sequencing and EN-based input monitoring - enables plug-and-play integration into multi-rail PDN.

Use Value: UV/OV fault detection on FB and thermal shutdown prevent system latch-up during brown-out or heatsink failure, improving field reliability.

Use Scenario: Powering ARM-based media SoCs (e.g., Amlogic S905X) requiring 1.0V core, 1.1V GPU, and 1.8V memory rails from 12V or 5V input.

IC Role / Device Role / Timing Role: Compact, single-chip POL solution supporting multiple output voltages via resistor-divider programming and soft-start coordination.

Use Value: Pre-bias startup and ±1% reference ensure clean boot of SoC without reset glitches, even when main 12V rail rises slowly after AC power-on.

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, 4.5–28V input, but uses voltage-mode control with external compensation; no integrated 3.3V LDO for bias.	Lacks thermally compensated OCP and pre-bias startup; requires additional components for UV/OV fault reporting.	Preferred where design flexibility in loop tuning outweighs integration benefits and board space is less constrained.
TPS546B24RVFT (TI)	6A, 4–18V input, PMBus-enabled, but larger 5mm × 5.5mm QFN and higher quiescent current (120 µA vs. 23 µA).	Supports digital telemetry and dynamic voltage scaling - unnecessary for fixed-output, cost-sensitive consumer applications.	Chosen when system-level telemetry, margining, or firmware-controlled configuration is required over analog simplicity.

Compared with MP8765GQ-Z and TPS546B24RVFT, IR3473MTR1PBF offers superior integration density and analog robustness - delivering full protection, startup, and regulation in a 4mm × 5mm footprint without external compensation or digital interface overhead.

Availability

IR3473MTR1PBF is available at Aetrix Electronics and suitable for notebook CPU core power, graphics card VRMs, and 12V distributed power systems requiring stable component supply, long-term lifecycle support, and qualified industrial-grade packaging (MSL2 @ 260°C).

Supply support for IR3473MTR1PBF 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 qualification standards aligned to AEC-Q100 and IATF 16949.

The IR3473 belongs to Infineon's SupIRBuck™ family - engineered for high-efficiency, space-constrained DC/DC conversion in computing and consumer electronics, emphasizing integration, thermal resilience, and ease-of-use in analog power design.

FAQ

What is the minimum recommended output capacitance for stable operation?

The IR3473MTR1PBF requires ≥150 µF total output capacitance, with at least one 100 µF low-ESR tantalum or polymer capacitor placed near the VOUT and PGND pins. Ceramic capacitance alone is insufficient due to COT control sensitivity to ESR zero placement; typical designs use 150 µF polymer + 10 µF X5R ceramics for high-frequency filtering.

Can the IR3473MTR1PBF operate with an input voltage below 3V?

No - the absolute minimum input voltage is 3V per the Recommended Operating Conditions table. Operation below 3V violates the internal gate drive and bias circuit requirements; attempting sub-3V operation causes erratic switching, failure to regulate, or permanent damage to the bootstrap circuit due to insufficient VBOOT headroom.

How is the over-current threshold set using the ISET pin?

The ISET pin sources a temperature-compensated current (19 µA typ at 25°C) into an external resistor tied to the PHASE node. The resulting voltage drop across the resistor sets the current-limit threshold: I_LIM ≈ 0.2V / R_ISET. For example, a 10 kΩ resistor yields ~20 A limit - but actual trip occurs at ~6A due to internal scaling and MOSFET R_DS(on) contribution.

Is the 3VCBP pin mandatory to connect?

Yes - the 3VCBP pin supplies the internal 3.3V LDO that powers analog comparators and reference circuits. It must be bypassed with a 1.0 µF ceramic capacitor to PGND; omission causes unstable PGOOD assertion, inaccurate UV/OV thresholds, and potential startup failure. In single-ground-plane layouts, a small series resistor (1–5 Ω) may be added to damp resonance.

IR3473MTR1PBF 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:: 6A

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)

IR3473MTR1PBF FAQ

1.How can I place an order for IR3473MTR1PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IR3473MTR1PBF 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 IR3473MTR1PBF reliable?

The price and inventory of IR3473MTR1PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3473MTR1PBF is usually 5 days.

3.What payment methods are accepted for IR3473MTR1PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3473MTR1PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IR3473MTR1PBF?

IR3473MTR1PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IR3473MTR1PBF 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 IR3473MTR1PBF?

For technical support, including IR3473MTR1PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3473MTR1PBF requirements.

6.How does Aetrix verify that IR3473MTR1PBF is sourced from the original manufacturer or authorized distributors?

All IR3473MTR1PBF 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 IR3473MTR1PBF meets industry standards.

7.What is the process for return or replacement of IR3473MTR1PBF?

All IR3473MTR1PBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3473MTR1PBF, 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 IR3473MTR1PBF part is unused and in its original packaging.

Return procedure for IR3473MTR1PBF:

1.Submit a request within 90 days.

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

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