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Infineon Technologies IR3473MTRPBF
- Part No.:
- IR3473MTRPBF
- Manufacturer:
- Infineon Technologies
- Package:
- 16-PowerVFQFN
- Datasheet:
-
IR3473MTRPBF.pdf
- Description:
- IC REG BUCK ADJ 6A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,982
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Product details
Overview
IR3473MTRPBF 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, and programmable switching frequency up to 750 kHz. It delivers precise 0.5–12V output from 3–27V input and supports pre-bias startup, thermally compensated overcurrent protection, and power-good signaling - deployed in notebook VRMs and 12V/24V POL systems.
For engineers reviewing the IR3473MTRPBF datasheet, IR3473MTRPBF pinout, IR3473MTRPBF application, or IR3473MTRPBF equivalent, key selection criteria include its integrated 25 mΩ/24 mΩ MOSFETs, FCCM/DCM mode selection via pin 1, soft-start capacitor programming (pin 6), and voltage-monitoring enable threshold (1.1–1.45 V).
Technical Context
The IR3473 implements a hysteretic constant-on-time control architecture that eliminates external loop compensation while maintaining tight output regulation across load transients. Its internal 0.5V reference feeds the FB comparator, and feed-forward (FF) pin adjusts on-time based on VIN to stabilize frequency under input variation.
Thermally compensated overcurrent protection uses the ISET pin to set trip current via an external resistor tied to PHASE, while the PGOOD open-drain output asserts after soft-start completion and valid output voltage detection. The device supports forced CCM (pin 1 = 3.3V) or diode-emulation DCM (pin 1 = GND) for efficiency optimization at light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 27V - supports wide-input industrial and computing rails including 12V and 24V distributed systems. |
| Output Voltage Range | 0.5V to 12V - enables core logic, GPU, and memory rail generation with 0.5V ±1% reference accuracy. |
| Continuous Output Current | 6A - delivered by integrated 25 mΩ upper and 24 mΩ lower MOSFETs, minimizing external component count. |
| Switching Frequency | Up to 750 kHz - programmable via FF pin resistor; higher frequencies reduce output filter size but increase switching loss. |
| Soft-Start Control | Capacitor-programmable on pin 6 - sets monotonic output ramp time; pull below 0.3V to initiate shutdown. |
| Power-Good Output | Open-drain PGOOD (pin 3) - signals valid regulation after soft-start and OVP/UVP pass; requires external 3.3V pull-up. |
| Enable Threshold | 1.1–1.45V rising edge - allows precise input voltage monitoring using two external resistors on EN pin. |
Pinout & Package
IR3473MTRPBF is housed in a thermally enhanced 4 mm × 5 mm QFN package with exposed thermal pad (PGND-connected), optimized for high-current DC/DC conversion in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FCCM | Mode control input | Set to 3.3V for forced continuous conduction mode; grounded for diode-emulation discontinuous mode. |
| 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 high-Z when output is within ±5% of target; requires external pull-up to confirm system readiness. |
| 4, 17 GND | Analog ground reference | Signal return for feedback, reference, and control circuitry; separate from power ground (PGND) to minimize noise coupling. |
| 5 FB | Feedback input | Inverting input to PWM comparator; monitors output via resistor divider to maintain 0.5V at node. |
| 6 SS | Soft-start/shutdown | Capacitor-to-ground sets startup ramp rate; pulled <0.3V to disable converter without disrupting bias. |
| 8 3VCBP | LDO bypass | Bypasses internal 3.3V LDO with 1 µF ceramic cap; series resistor may be needed in single-ground PCB layouts. |
| 10 VCC | Gate drive supply | 5V supply for high-side driver; requires ≥1 µF ceramic decoupling close to pin. |
| 11 PGND | Power ground return | High-current return path for lower MOSFET and output capacitor; must connect directly to thermal pad. |
| 12 PHASE | Switching node | Connection between high- and low-side MOSFETs; drives external bootstrap capacitor and senses current via ISET. |
| 13 VIN | Main input supply | Primary power input (3–27V); routed with low-inductance path to minimize switching noise and voltage spikes. |
| 14 BOOT | Bootstrap supply | Drives high-side gate; capacitor from BOOT to PHASE provides floating voltage above PHASE for NMOS turn-on. |
| 15 FF | Feed-forward input | Resistor to VIN adjusts on-time inversely with input voltage, stabilizing switching frequency across line variation. |
| 16 EN | Enable with monitoring | Turns device on/off; voltage divider sets precise UVLO threshold (1.1–1.45V) for input rail supervision. |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Constant-on-time hysteretic control eliminates loop compensation components, reducing BOM count and layout sensitivity. |
| Thermally compensated overcurrent protection | ISET pin current drift is trimmed to ±4400 ppm/°C, ensuring stable current limit across –40°C to +125°C junction range. |
| Pre-bias start-up capability | Allows safe startup into pre-charged output capacitors without reverse current flow or output overshoot. |
| Precision 0.5V reference | 0.5V ±1% (0.495–0.505 V) reference enables accurate output setting down to sub-1V core rails with minimal divider error. |
| Programmable soft-start and shutdown | Capacitor on SS pin controls ramp time; pulling SS <0.3V initiates controlled shutdown without disrupting system sequencing. |
Applications
| Notebook CPU/GPU Core Rail | 12V/24V Distributed POL System |
|---|---|
Use Scenario: Regulating 0.85–1.2V core voltage for Intel/AMD mobile processors under dynamic load steps up to 6A. IC Role / Device Role / Timing Role: Primary synchronous buck controller delivering tightly regulated core power with fast transient response and pre-bias startup. Use Value: Integrated 25 mΩ/24 mΩ MOSFETs and constant-on-time control achieve >90% efficiency at 1A and maintain <±1% output accuracy during 4A/µs load transients. | Use Scenario: Point-of-load conversion in industrial PLCs or telecom shelves where 12V or 24V backplane supplies local 3.3V/5V rails. IC Role / Device Role / Timing Role: Self-contained POL regulator with voltage-monitoring EN and PGOOD signaling for system-level power sequencing and fault reporting. Use Value: FCCM/DCM pin-selectable operation enables peak efficiency (>85%) at light loads and stable regulation under wide input variation (3–27V). |
| Consumer STB/LCD TV Logic Supply | Game Console Memory Rail |
Use Scenario: Generating 1.8V or 3.3V for SoC I/O, DDR termination, and display interface logic in set-top boxes and LCD TVs. IC Role / Device Role / Timing Role: Compact, low-noise buck regulator with soft-start and UV/OV fault protection for consumer-grade reliability. Use Value: 4×5mm QFN package and integrated MOSFETs reduce solution footprint by >40% vs. controller+discrete-FET designs; PGOOD confirms rail stability before SoC boot. | Use Scenario: Supplying 1.2V DDR4/DDR5 memory rails in gaming consoles requiring fast transient response and thermal robustness. IC Role / Device Role / Timing Role: High-current buck regulator with thermally compensated OCP and 125°C shutdown for sustained GPU-memory co-location. Use Value: 6A continuous rating and 140°C thermal shutdown threshold ensure reliable operation under sustained 10W+ memory subsystem loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | 4A rated, 3–36V input, no integrated FF pin; fixed 500kHz frequency; lacks FCCM/DCM select and pre-bias startup. | Suitable for simpler 4A POLs without advanced sequencing or wide-VIN efficiency tuning. | Select when cost-sensitive 4A design tolerates fixed frequency and no light-load DCM optimization. |
| TPS546B24RVFT | 6A, 4–18V input, PMBus-enabled, 0.6V reference, requires external compensation; supports AVS and telemetry. | Targeted at server/enterprise applications needing digital control, margining, and telemetry-not consumer or embedded cost-sensitive use. | Select only when digital interface, remote monitoring, or adaptive voltage scaling are mandatory requirements. |
Compared with MP2315DJ-LF-Z and TPS546B24RVFT, IR3473MTRPBF uniquely balances integration (no compensation, built-in MOSFETs), analog flexibility (FCCM/DCM, FF, SS), and thermal robustness (140°C shutdown) for mid-power embedded and computing POLs without digital overhead.
Availability
IR3473MTRPBF is available at Aetrix Electronics and suitable for notebook VRMs, 12V/24V distributed power systems, and consumer STB/LCD TV logic supplies requiring stable component supply, long-lifecycle support, and qualified MSL2 packaging.
Supply support for IR3473MTRPBF 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.
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, thermal resilience, and minimal external component count.
FAQ
What is the recommended layout practice for the thermal pad of IR3473MTRPBF?
The exposed thermal pad (pins 4, 11, 17) must be soldered to a solid PGND copper plane with ≥4 thermal vias (0.3mm diameter, spaced ≤1mm apart) connecting to inner-layer ground planes. Avoid splitting the pad or routing signals underneath it to ensure optimal thermal dissipation and noise isolation.
How does the ISET pin implement thermally compensated overcurrent protection?
The ISET pin sources a current (17–21 µA at 25°C) with a temperature coefficient of 4400 ppm/°C, enabling an external resistor to PHASE to set a current-limit threshold that tracks MOSFET RDS(on) rise with temperature - preventing false trips during thermal stress.
Can IR3473MTRPBF operate with a 3.3V input supply?
Yes - the minimum VIN is 3V per absolute maximum ratings and recommended operating conditions. At 3V input, output is limited to ≤3.3V due to dropout constraints, and efficiency drops below 80% at full 6A load; verify thermal performance with derating.
What failure protections are active during startup?
During soft-start, IR3473MTRPBF monitors FB for under-voltage (0.37–0.43V) and over-voltage (0.586–0.655V) faults, disables switching if VCC falls below 3.9V, and asserts thermal shutdown if junction exceeds 125°C - all before PGOOD is released.
IR3473MTRPBF 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)
IR3473MTRPBF FAQ
1.How can I place an order for IR3473MTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3473MTRPBF 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 IR3473MTRPBF reliable?
The price and inventory of IR3473MTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3473MTRPBF is usually 5 days.
3.What payment methods are accepted for IR3473MTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3473MTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3473MTRPBF?
IR3473MTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3473MTRPBF 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 IR3473MTRPBF?
For technical support, including IR3473MTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3473MTRPBF requirements.
6.How does Aetrix verify that IR3473MTRPBF is sourced from the original manufacturer or authorized distributors?
All IR3473MTRPBF 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 IR3473MTRPBF meets industry standards.
7.What is the process for return or replacement of IR3473MTRPBF?
All IR3473MTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3473MTRPBF, 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 IR3473MTRPBF part is unused and in its original packaging.
Return procedure for IR3473MTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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