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 IR3841WMTR1PBF

Name: IR3841WMTR1PBF
Brand: Infineon Technologies
SKU: IR3841WMTR1PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: IR3841WMTR1PBF

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 15-PowerVQFN

Datasheet:: IR3841WMTR1PBF.pdf

Description:: IC REG BUCK ADJ 8A PQFN

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,467

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

Product details

Overview

IR3841WMTR1PBF from Infineon Technologies is an integrated 8A synchronous buck regulator with on-die high- and low-side MOSFETs, PWM controller, bootstrap diode, and precision 0.7V ±1% reference. It operates from 1.5V–16V input, delivers 0.7V–0.9×Vin output, achieves >96% peak efficiency at 12V_IN/1.8V_OUT/8A, and supports programmable 225–1650kHz switching frequency for server VR12/VR13 point-of-load applications.

For engineers reviewing the IR3841WMTR1PBF datasheet, IR3841WMTR1PBF pinout, IR3841WMTR1PBF application, or IR3841WMTR1PBF equivalent, key selection criteria include its integrated power stage, hiccup-mode overcurrent protection, pre-bias startup capability, thermal shutdown at 140°C, and compatibility with 5mm × 6mm Power QFN layout in high-density computing power delivery.

Technical Context

The IR3841WMTR1PBF implements a voltage-mode synchronous buck architecture with internal gate drivers, fixed off-time control (130–200ns), and a high-bandwidth error amplifier (GBWP: 20–40MHz, slew rate: 7–20V/μs). Its programmable oscillator uses an external RT resistor to set frequency from 225kHz to 1.5MHz, while the OCSET pin configures current limit via a resistor-to-SW connection.

It features dual ground domains (GND for signal, PGND for power), separate BOOT/SW node with integrated bootstrap diode (V_F = 180–470mV @ 30mA), and PGood monitoring with upper/lower thresholds (0.77–0.84V / 0.56–0.63V) and 256/F_s delay. Enable input includes UVLO (1.14–1.36V start, 0.9–1.06V stop) and voltage monitoring capability.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	Continuous 8A load capability enables single-chip solution for mid-power CPU/GPU core rails.
Input Voltage Range	1.5V to 16V supports wide-range intermediate bus architectures including 3.3V, 5V, 12V, and 15V inputs.
Output Voltage Range	0.7V to 0.9×Vin allows dynamic scaling down to sub-1V for modern low-voltage processors.
Switching Frequency	Programmable 225–1650kHz permits optimization of size (higher f_s) vs. efficiency (lower f_s) in space-constrained designs.
Reference Voltage	Precision 0.7V ±1% (0°C–125°C) ensures tight output regulation without external trimming components.
Efficiency	Greater than 96% peak efficiency at 12V_IN/1.8V_OUT/8A reduces thermal load and improves system power density.
Junction Temp Range	–40°C to +125°C operation supports industrial and telecom environments with extended thermal margins.

Pinout & Package

IR3841WMTR1PBF is housed in a thermally enhanced 5mm × 6mm Power QFN package with 0.9mm height, 15-pin layout, exposed thermal pad, and RoHS-compliant lead-free/halogen-free construction.

Pin/Terminal	Circuit Role	Design Meaning
1 Seq	Sequencing input	Enables simultaneous power-up tracking with external resistors; tie to VCC if unused.
2 FB	Error amplifier inverting input	Connects to output voltage divider to set regulated output; determines feedback loop stability.
3 Comp	Error amplifier output	Interface for external RC compensation network to optimize transient response and phase margin.
4 Gnd	Signal ground	Reference return for internal bias, reference, and control circuitry; separate from PGND.
5 Rt	Oscillator timing	Resistor-to-ground sets switching frequency; 59kΩ yields ~250kHz, 9.31kΩ yields ~1.5MHz.
6 SS/SD	Soft-start/shutdown	Capacitor-to-ground programs startup time; <0.3V forces shutdown with hiccup recovery.
7 OCSet	Overcurrent threshold	Resistor-to-SW sets current limit; value scales linearly with measured OCSET current (20.8–172μA).
8 PGood	Power-good status	Open-drain output signals valid regulation; requires external pull-up to VCC.
9 VCC	Bias supply	Powers internal logic and drivers; requires ≥1μF high-frequency ceramic capacitor to PGND.
10 PGnd	Power ground	Dedicated return path for high-current MOSFET drivers; must connect to system power plane.
11 SW	Switch node	Connection point for external inductor; carries high dv/dt and pulsed current.
12 VIN	Main input	Primary DC input rail (1.5–16V); feeds high-side FET and internal LDO for VCC generation.
13 Boot	Bootstrap supply	Charged via internal diode from SW; supplies high-side driver; requires 0.1μF capacitor to SW.
14 Enable	Startup control	UVLO-enabled input; 1.14–1.36V rising edge enables device; tie to VCC for always-on operation.
15 Gnd	Signal ground	Second signal ground pin; must be connected to same net as Pin 4 for noise immunity.

Key Features

Feature	Design Value
Integrated Power Stage	Co-packaged high-side (17.8mΩ R_DS(on)) and low-side (8.5mΩ R_DS(on)) MOSFETs eliminate external FET selection and layout complexity.
Enhanced Pre-Bias Start-up	Allows safe startup into pre-biased output without reverse current flow-critical for multi-rail systems with staggered sequencing.
Hiccup Current Limit	Auto-retry protection mode limits fault energy during short-circuit events, reducing thermal stress and enabling self-recovery.
Programmable Soft-Start	External capacitor on SS/SD pin controls ramp rate, preventing inrush current and ensuring controlled voltage rise across load capacitance.
Thermal Protection	140°C junction shutdown with 20°C hysteresis prevents permanent damage and supports reliable long-term operation under overload conditions.

Applications

Server Core Voltage Regulation

Storage Controller Power

Use Scenario: Regulating 0.8–1.2V core supply for dual-socket x86 CPUs in 1U/2U rack servers with strict thermal and efficiency targets.

IC Role / Device Role / Timing Role: Primary point-of-load (POL) regulator delivering up to 8A with fast transient response and precise voltage accuracy.

Use Value: Integrated MOSFETs and 96%+ efficiency reduce board area and heat sink requirements, enabling higher compute density per rack unit.

Use Scenario: Powering NVMe SSD controllers and DRAM buffers in enterprise storage enclosures requiring stable low-noise 1.2V/1.8V rails.

IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter with hiccup OCP and pre-bias startup for hot-pluggable modules.

Use Value: Programmable soft-start and PGood signaling ensure clean power sequencing with host BIOS, avoiding initialization failures during drive insertion.

Embedded Telecom Baseband

Industrial FPGA I/O Bank Supply

Use Scenario: Providing 0.9V–1.1V supply to baseband ASICs in 5G small cell radios operating in -40°C to +85°C ambient.

IC Role / Device Role / Timing Role: Robust POL regulator with extended temperature range, thermal shutdown, and wide input support for unregulated 12V intermediate bus.

Use Value: –40°C to +125°C junction rating and 140°C thermal shutdown ensure reliability in sealed, fanless outdoor enclosures.

Use Scenario: Delivering 1.2V, 1.8V, or 2.5V to configurable I/O banks of Xilinx/Intel FPGAs in programmable logic controllers and test equipment.

IC Role / Device Role / Timing Role: Flexible output voltage regulator supporting multiple I/O standards via external feedback divider and sequenced enable via Seq pin.

Use Value: Pin-compatible variants (4A/12A/14A) allow scalable design reuse across product families with minimal PCB changes.

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, smaller 3mm × 3mm QFN, no Seq pin, fixed 500kHz f_s, lower max input (16V same, but V_CC limited to 6V)	Suitable for lower-current FPGA I/O or microcontroller rails where sequencing and programmability are not required	Select when cost and footprint are prioritized over current headroom and feature flexibility
TPS54821RHLR	8A rated, 4mm × 4mm QFN, supports PMBus interface, higher quiescent current (1.2mA vs. 500μA standby), no integrated bootstrap diode	Preferred for digitally managed power systems requiring telemetry, margining, and real-time configuration	Select when digital control, telemetry, and system-level power management outweigh analog simplicity

Compared with MP2315DJ-LF-Z and TPS54821RHLR, the IR3841WMTR1PBF uniquely balances high integration (MOSFETs + bootstrap diode), analog programmability (f_s, OC, SS), and robust analog sequencing-making it optimal for analog-controlled, high-current, thermally constrained POL designs without digital overhead.

Availability

IR3841WMTR1PBF is available at Aetrix Electronics and suitable for server applications, storage applications, and embedded telecom systems requiring stable component supply, long-lifecycle availability, and consistent parametric performance across production batches.

Supply support for IR3841WMTR1PBF 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, industrial, and security ICs, with leadership in silicon and silicon carbide power devices.

The IR3841W SupIRBuck™ product line delivers fully integrated, high-current synchronous buck regulators optimized for high-efficiency, space-constrained point-of-load power delivery in computing and communications infrastructure.

FAQ

What is the recommended minimum output capacitance for stable operation at 8A?

The IR3841WMTR1PBF datasheet specifies a minimum 220μF total output capacitance using low-ESR ceramic or polymer capacitors. Typical designs use ≥330μF with ≤1mΩ ESR to meet transient response requirements for CPU loads, especially when paired with the recommended 0.4–1.0μH inductors listed in PD-97658 Rev 8.0.

Does IR3841WMTR1PBF support forced continuous conduction mode (FCCM)?

No-IR3841WMTR1PBF operates exclusively in voltage-mode PWM with fixed off-time control and does not include a dedicated FCCM pin or mode. It transitions naturally between CCM and DCM based on load and operating point, with hiccup-mode OCP active in overload conditions.

How is thermal performance affected by PCB copper area under the exposed pad?

Thermal resistance θ_JA drops from 35°C/W (standard JEDEC 2s2p board) to ≤18°C/W with ≥400mm² of 2oz copper connected to the exposed thermal pad via ≥4 thermal vias. This directly impacts maximum sustained 8A output capability at elevated ambient temperatures.

Can the Seq pin be used for power-down sequencing as well as power-up?

Yes-the Seq pin supports bidirectional tracking: during power-up, it monitors upstream rail voltage via resistor divider to delay enable; during power-down, it can be configured with external circuitry to assert a controlled disable signal, enabling coordinated shutdown across multiple rails in complex power systems.

IR3841WMTR1PBF Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: SupIRBuck®

Package/Case:: 15-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):: 1.5V

Voltage - Input (Max):: 16V

Voltage - Output (Min/Fixed):: 0.7V

Voltage - Output (Max):: 14.4V

Current - Output:: 8A

Frequency - Switching:: 225kHz ~ 1.65MHz

Synchronous Rectifier:: Yes

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PQFN (5x6)

IR3841WMTR1PBF FAQ

1.How can I place an order for IR3841WMTR1PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IR3841WMTR1PBF 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 IR3841WMTR1PBF reliable?

The price and inventory of IR3841WMTR1PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3841WMTR1PBF is usually 5 days.

3.What payment methods are accepted for IR3841WMTR1PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3841WMTR1PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IR3841WMTR1PBF?

IR3841WMTR1PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IR3841WMTR1PBF 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 IR3841WMTR1PBF?

For technical support, including IR3841WMTR1PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3841WMTR1PBF requirements.

6.How does Aetrix verify that IR3841WMTR1PBF is sourced from the original manufacturer or authorized distributors?

All IR3841WMTR1PBF 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 IR3841WMTR1PBF meets industry standards.

7.What is the process for return or replacement of IR3841WMTR1PBF?

All IR3841WMTR1PBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3841WMTR1PBF, 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 IR3841WMTR1PBF part is unused and in its original packaging.

Return procedure for IR3841WMTR1PBF:

1.Submit a request within 90 days.

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

Tech Hub

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

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…