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

Infineon Technologies IR3447MTRPBF

Name: IR3447MTRPBF
Brand: Infineon Technologies
SKU: IR3447MTRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IR3447MTRPBF

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 35-PowerVQFN

Datasheet:: IR3447MTRPBF.pdf

Description:: IC REG BUCK ADJ 25A 35PQFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

IR3447MTRPBF from Infineon Technologies is a highly integrated synchronous buck DC-DC regulator with integrated MOSFET drivers, Smart LDO, and remote differential voltage sensing. It delivers up to 25A output current, supports 1.5V–21V input, regulates down to 0.6V output, features 0.5% reference accuracy, and operates up to 1.5MHz switching frequency. It is used in server point-of-load power delivery where tight regulation, thermal robustness, and pre-bias startup are critical.

For engineers reviewing the IR3447MTRPBF datasheet, IR3447MTRPBF pinout, IR3447MTRPBF application, or IR3447MTRPBF equivalent, key selection criteria include its programmable current limit (via OCset), true differential remote sense (RS+/RS−), feed-forward line regulation, hiccup-mode overcurrent protection, and post-package trimmed dead-time for high-efficiency operation at high current.

Technical Context

The IR3447 implements a digitally assisted analog PWM controller with internal soft-start clocking, zero-crossing detection, and body braking for improved transient response. Its feed-forward architecture dynamically adjusts ramp amplitude based on PVin slew rate (1.02–2.4 V_p-p), enabling stable loop behavior across wide input ranges.

It integrates dual MOSFET drivers with post-package trimmed rising-edge dead-time, a dedicated remote sense amplifier (BW = 3–9 MHz, offset ≤ ±2 mV), and independent OVP/PGOOD circuitry that remains active even when Enable is low-ensuring system-level fault visibility during standby.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	±25 A continuous - supports high-current CPU/GPU core rails without external current sharing.
Input Voltage Range	1.5 V to 21 V - accommodates 5 V, 12 V, and 19 V intermediate bus architectures with external Vcc bias.
Output Voltage Accuracy	±0.5 % at 0°C–105°C - enables sub-10 mV regulation error at 1.2 V output for advanced logic supplies.
Switching Frequency	300 kHz to 1.5 MHz - selectable via Rt resistor or external sync signal for EMI optimization and inductor size reduction.
Thermal Resistance θJA	14.7 °C/W - validated on high-thermal-conductivity PCB, enabling 25 A operation at ≤125°C junction temperature.
Remote Sense Accuracy	±1.5 mV offset (–40°C to 125°C) - ensures <10 mV total voltage drop compensation across long PCB traces.
Power Good Logic	Dedicated open-drain PGD pin with OVP monitoring active during Enable=low - provides fail-safe rail validation before system boot.

Pinout & Package

IR3447MTRPBF uses a thermally enhanced 5 mm × 6 mm PQFN package with exposed thermal pad (PGND-connected) and 33-pin layout optimized for high-current power delivery and minimal parasitic inductance.

Pin/Terminal	Circuit Role	Design Meaning
1 PVin	Main power stage input	Connects to bulk input capacitor; feeds feed-forward block and high-side driver supply path.
2 Boot	High-side gate driver supply	Requires bootstrap capacitor to SW; supports 4.5–7.5 V gate drive with 360–960 mV forward diode drop.
3 Enable	System enable control	UVLO thresholds: 1.14–1.36 V (rising), 0.9–1.06 V (falling); leakage ≤1 µA at 3.3 V.
4 Rt/Sync	Frequency programming / sync input	Resistor sets f_SW (300–1500 kHz); accepts external sync pulses (100–200 ns width, 0.6–3 V level).
5 OCset	Current limit configuration	Three settings: float (25 A), tie to VCC (20 A), tie to PGND (15 A) - sets hiccup-mode trip threshold.
6 Vsns	OVP and PGood sense node	Dedicated input for overvoltage detection and power-good assertion; remains active during Enable=low.
7 FB	Error amplifier inverting input	Connects to output divider or remote sense amp output; 0.6 V reference with ±0.5 % accuracy.
8 COMP	Error amplifier output	Drives external RC compensation network; source/sink capability: 4–11 mA / 0.4–1.2 mA.
9 RSo	Remote sense amplifier output	Drives FB node; unity-gain bandwidth 3–9 MHz; output swing limited to V_CC − 0.5 V to 1.5 V.
10,26,27,29 PGND	Power ground return	Multiple low-inductance connections to thermal pad; must be tied directly to input/output capacitors.
11 LGND	Signal ground reference	Isolated reference for internal comparators, VREF, and error amplifier; keep separate from PGND except at single point.
12 RS− / 13 RS+	True differential remote sense inputs	RS+ connects to load VOUT; RS− connects to load GND; input impedance ≥45 kΩ; offset ≤±2 mV.
14 CByp	VREF bypass	100–180 pF capacitor to LGND stabilizes 0.6 V reference; critical for output accuracy and noise immunity.
16 PGD	Open-drain power good status	Asserts low when VOUT is within ±10 % of target; requires external pull-up to VCC/LDO_out.
17 Vin	LDO input supply	Must be ≥5 V; ties to external 5–21 V rail; enables Smart LDO operation when VCC is externally regulated.
18 VCC/LDO_out	Bias supply output	Regulated 6.3–7.1 V (Io ≤30 mA); dropout ≤0.7 V at 70 mA; requires ≥4.7 µF ceramic bypass to PGND.
20–25,32 SW	Switch node	Connects to power inductor; handles full 25 A peak current; AC rating: –4 V to 25 V (100 ns).

Key Features

Feature	Design Value
Integrated MOSFET drivers + bootstrap diode	Eliminates external high-side gate driver and discrete bootstrap diode; reduces BOM count and layout area.
Smart LDO for VCC generation	Enables self-biasing from Vin while maintaining efficiency >90 % at light loads; supports external VCC override.
Enhanced pre-bias startup	Allows safe start-up into pre-charged output capacitors without reverse current or latch-up risk.
Body braking during transients	Actively sinks inductor current during load steps, reducing output voltage undershoot by up to 40 % vs. standard buck.
Thermally compensated current limit	Hiccup-mode OCP adjusts trip point with junction temperature to maintain consistent fault margin across –40°C to 125°C.

Applications

Server Core Power

Distributed PoL Architecture

Use Scenario: Delivering 1.2 V @ 25 A to multi-core Xeon/EPYC processors in 1U rack servers with strict thermal envelope.

IC Role / Device Role / Timing Role: Primary synchronous buck regulator with integrated drivers, remote sensing, and digital soft-start sequencing.

Use Value: 0.5 % VREF accuracy and true differential sensing maintain <±5 mV output tolerance under 10 A/µs load transients.

Use Scenario: Local 0.85 V supply for FPGA I/O banks distributed across backplane-mounted carrier cards.

IC Role / Device Role / Timing Role: Point-of-load regulator with external sync capability to align switching edges and reduce system-level EMI.

Use Value: Programmable 300–1500 kHz frequency allows matching to master clock domain and minimizing beat frequencies.

Set-Top Box SoC Supply

Industrial GPU Module

Use Scenario: Powering 1.0 V core rail for ARM-based media SoCs in consumer STBs with space-constrained 4-layer PCB.

IC Role / Device Role / Timing Role: Compact, fully integrated buck converter with Smart LDO and internal bootstrap diode.

Use Value: 5 mm × 6 mm PQFN footprint and integrated drivers reduce solution size by 35 % vs. controller + discrete FET solution.

Use Scenario: High-reliability 0.95 V supply for embedded GPU in industrial vision systems operating at –40°C to 85°C ambient.

IC Role / Device Role / Timing Role: Thermally robust buck regulator with hiccup-mode OCP and extended junction range (–40°C to 125°C).

Use Value: Thermal shutdown and junction-compensated current limit ensure fault containment without derating at full 25 A load.

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)	40 V max input, 20 A rated, no integrated bootstrap diode, requires external high-side driver support.	Lacks true differential remote sense and dedicated Vsns OVP; PGD inactive when EN=low.	Prefer for higher-input-voltage industrial apps where external driver layout is acceptable and remote sense not required.
TPS53689T (Texas Instruments)	Supports 3-phase interleaving, 60 A total, includes PMBus interface, larger 7 mm × 7 mm QFN.	Targets multi-phase CPU VRs; lacks Smart LDO and body braking; higher BOM cost and complexity.	Choose for scalable multi-rail systems needing telemetry and phase synchronization; avoid for single-rail space-constrained designs.

Compared with MP8765GQ-Z and TPS53689T, IR3447MTRPBF uniquely combines 25 A capability, true differential remote sensing, active OVP during disable, and integrated bootstrap diode in a 5 mm × 6 mm footprint-making it optimal for compact, high-accuracy single-phase PoL applications.

Availability

IR3447MTRPBF is available at Aetrix Electronics and suitable for server power delivery, distributed point-of-load architectures, and set-top box SoC supplies requiring stable component supply, full RoHS compliance, and production-ready tape-and-reel packaging (4000 pcs/reel).

Supply support for IR3447MTRPBF 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 certification to ISO/TS 16949 and IATF 16949.

The SupIRBuck® product line delivers fully integrated, high-current DC-DC regulators targeting space-constrained, high-efficiency point-of-load applications in datacenter, telecom, and consumer electronics.

FAQ

What is the minimum output voltage supported by IR3447MTRPBF?

The IR3447MTRPBF supports an output voltage range from 0.6 V to 0.86 × PVin. Its 0.6 V reference voltage is trimmed to ±0.5 % over 0°C–105°C, enabling precise low-voltage regulation for modern processor cores. The FB pin is designed for direct connection to a resistor divider or remote sense amplifier output, and the error amplifier's common-mode input range extends down to 0 V.

How does the OCset pin configure current limiting?

The OCset pin selects one of three hiccup-mode overcurrent thresholds: floating (25 A), tied to VCC/LDO_out (20 A), or tied to PGND (15 A). This configuration is sampled at power-up and remains fixed during operation. The current limit is thermally compensated, adjusting trip point with junction temperature to maintain consistent protection across –40°C to 125°C.

Can IR3447MTRPBF operate without an external VCC supply?

Yes. The Smart LDO generates VCC/LDO_out (6.3–7.1 V) from Vin (5–21 V), eliminating need for external bias. However, if VCC is supplied externally (e.g., from another rail), Vin must still be connected per datasheet Note 4 to enable proper LDO control and UVLO functionality.

What is the purpose of the Vsns pin, and how does it differ from FB?

The Vsns pin provides dedicated input for overvoltage protection and power-good assertion, independent of the FB feedback loop. It remains monitored and functional even when Enable is low-unlike FB, which is inactive during shutdown. Vsns connects directly to the output rail and triggers PGD deassertion and OVP shutdown if voltage exceeds programmed threshold, enhancing system safety.

IR3447MTRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: SupIRBuck®

Package/Case:: 35-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):: 5V

Voltage - Input (Max):: 21V

Voltage - Output (Min/Fixed):: 0.6V

Voltage - Output (Max):: 18.06V

Current - Output:: 25A

Frequency - Switching:: 300kHz ~ 1.5MHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 35-PQFN (5x6)

IR3447MTRPBF FAQ

1.How can I place an order for IR3447MTRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IR3447MTRPBF 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 IR3447MTRPBF reliable?

The price and inventory of IR3447MTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3447MTRPBF is usually 5 days.

3.What payment methods are accepted for IR3447MTRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3447MTRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IR3447MTRPBF?

IR3447MTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IR3447MTRPBF 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 IR3447MTRPBF?

For technical support, including IR3447MTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3447MTRPBF requirements.

6.How does Aetrix verify that IR3447MTRPBF is sourced from the original manufacturer or authorized distributors?

All IR3447MTRPBF 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 IR3447MTRPBF meets industry standards.

7.What is the process for return or replacement of IR3447MTRPBF?

All IR3447MTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3447MTRPBF, 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 IR3447MTRPBF part is unused and in its original packaging.

Return procedure for IR3447MTRPBF:

1.Submit a request within 90 days.

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

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