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

Infineon Technologies IR3841WMTRPBF

Name: IR3841WMTRPBF
Brand: Infineon Technologies
SKU: IR3841WMTRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IR3841WMTRPBF

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 15-PowerVQFN

Datasheet:: IR3841WMTRPBF.pdf

Description:: IC REG BUCK ADJ 8A PQFN

Quantity:: RFQ Add To RFQ list

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Inventory:2,561

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Product details

Overview

IR3841WMTRPBF 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 8A, and supports programmable switching frequency up to 1.5MHz. Used in server point-of-load power rails for CPU/GPU core voltage regulation.

For engineers reviewing the IR3841WMTRPBF datasheet, IR3841WMTRPBF pinout, IR3841WMTRPBF application, or IR3841WMTRPBF equivalent, key selection criteria include its integrated 17.8mΩ/8.5mΩ MOSFETs, hiccup-mode overcurrent protection, pre-bias start-up capability, PGood open-drain status signal, and thermal shutdown at 140°C junction temperature.

Technical Context

The IR3841WMTRPBF implements a current-mode synchronous buck topology with internal high-bandwidth error amplifier (GBWP: 20–40MHz, slew rate: 7–20V/μs) and programmable oscillator via external RT resistor (225–1650kHz). Its dual-ground architecture separates PGND (for MOSFET drivers) and GND (for control circuitry), minimizing noise coupling in high-dI/dt switching.

Protection logic includes adjustable overcurrent threshold via OCSet pin (20.8–172μA range), soft-start timing controlled by external capacitor on SS/SD pin, and precise power-good monitoring with 256-cycle delay and hysteresis (±35mV upper/lower thresholds). Enable input features voltage-monitoring UVLO (1.14–1.36V turn-on).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	Continuous 8A load capability enables single-regulator supply for mid-tier CPU cores or FPGA I/O banks.
Input Voltage Range	1.5V to 16V supports wide-range intermediate bus architectures including 3.3V, 5V, 12V, and 15V rails.
Reference Voltage	0.7V ±1% (–40°C to 125°C) ensures tight output regulation accuracy across industrial temperature range.
Switching Frequency	Programmable 225–1650kHz allows optimization of size (higher fSW → smaller inductor/capacitor) vs. efficiency (lower fSW → reduced switching loss).
Efficiency	>96% peak efficiency at 12V_IN/1.8V_OUT/8A reduces thermal load and improves system power density.
Package Thermal Resistance	θ_JA = 35°C/W enables 8A operation without forced airflow in 5mm × 6mm Power QFN footprint.
Protection Features	Hiccup current limit, thermal shutdown (140°C), pre-bias start-up, and PGood sequencing support robust system-level reliability.

Pinout & Package

IR3841WMTRPBF uses a 15-pin 5mm × 6mm Power QFN package with 0.9mm height, exposed thermal pad, and RoHS-compliant lead-free/halogen-free construction.

Pin/Terminal	Circuit Role	Design Meaning
1 Seq	Sequencing control input	Enables simultaneous or staggered power-up with other regulators using external resistor divider; tied to Vcc if unused.
2 Fb	Error amplifier inverting input	Connects to output voltage divider to set regulated output; determines feedback loop stability and transient response.
3 Comp	Error amplifier output	Interface for external RC compensation network to tailor loop bandwidth and phase margin.
4,15 Gnd	Signal ground reference	Provides low-noise return path for internal reference and control circuitry; separate from PGnd.
5 Rt	Oscillator frequency set	External resistor to GND programs switching frequency from 225kHz to 1650kHz with ±10% accuracy.
6 SS/SD	Soft-start/shutdown control	Capacitor-to-GND sets ramp time; pulled low (<0.3V) forces immediate shutdown with hiccup recovery.
7 OCSet	Overcurrent threshold adjust	Resistor from OCSet to SW pin sets current limit threshold; supports adaptive OCP scaling with switching frequency.
8 PGood	Power-good status output	Open-drain signal asserts high when output is within ±5% of target; requires external pull-up to Vcc.
9 Vcc	Internal IC supply	Powers control logic and gate drivers; requires ≥1μF high-frequency ceramic capacitor to PGnd.
10 PGnd	Power ground return	Dedicated return for high-current MOSFET drivers; must connect directly to PCB power ground plane.
11 SW	Switch node	Connects to inductor and bootstrap capacitor; carries high dI/dt switching waveform; layout critical for EMI.
12 Vin	Main input voltage rail	Accepts 1.5–16V DC input; decoupling capacitors required near pin for high-frequency current return.
13 Boot	High-side driver supply	0.1μF capacitor to SW provides floating bias for top MOSFET gate drive; forward voltage ≤470mV.
14 Enable	Startup enable control	UVLO threshold 1.14–1.36V rising; leakage current ≤15μA; tied to Vcc for always-on operation.

Key Features

Feature	Design Value
Integrated MOSFETs	Co-packaged 17.8mΩ high-side and 8.5mΩ low-side MOSFETs eliminate external FET selection and layout complexity.
Pre-bias start-up	Allows safe startup into pre-charged output capacitors without reverse current flow or output overshoot.
Programmable soft-start	Adjustable ramp time via external capacitor prevents inrush current and stabilizes multi-rail sequencing.
Thermal protection	Automatic shutdown at 140°C junction temperature with 20°C hysteresis prevents permanent damage during overload.
Tracking capability	Seq pin enables output voltage tracking with upstream regulators for DDR memory or multi-core processor power domains.

Applications

Server CPU Core Rail

Storage Controller I/O Supply

Use Scenario: Regulating 1.8V core voltage for dual-socket x86 servers with dynamic load steps up to 8A.

IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering tightly regulated, low-noise power with fast transient response.

Use Value: >96% efficiency reduces board-level heat generation; hiccup OCP prevents thermal runaway during cache flush events.

Use Scenario: Powering NVMe SSD controller ASICs requiring stable 1.2V at up to 6A with sequencing relative to 3.3V auxiliary rail.

IC Role / Device Role / Timing Role: Synchronous buck converter with Seq pin enabling voltage tracking during hot-plug insertion.

Use Value: Pre-bias start-up avoids back-driving PCIe link; PGood signal coordinates firmware initialization sequence.

Embedded Telecom Baseband

Industrial FPGA I/O Bank

Use Scenario: Supplying 0.9V to LTE/5G baseband processors in fanless outdoor small cells operating from –40°C to 85°C ambient.

IC Role / Device Role / Timing Role: High-efficiency DC/DC regulator with extended temperature rating and robust fault handling.

Use Value: 0.7V ±2% reference accuracy over full –40°C to 125°C junction range ensures consistent signal integrity.

Use Scenario: Delivering 1.5V to Xilinx Artix-7 FPGA I/O banks in programmable logic controllers with strict EMC requirements.

IC Role / Device Role / Timing Role: Low-EMI buck regulator leveraging fixed off-time (130–200ns) and deadband control (5–30ns).

Use Value: Dual-ground (PGnd/Gnd) separation minimizes switching noise coupling into sensitive analog sensor interfaces.

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, 2.5–16V input, 0.8V reference, no Seq pin, smaller 3mm × 4mm QFN	Limited to lower-current applications; lacks tracking and pre-bias start-up	Select when cost-sensitive designs require <5A output and simplified sequencing.
TPS54821RHLR	8A rated, 4.5–20V input, 0.6V reference, integrated LDO for VCC, no bootstrap diode	Requires external bootstrap diode; higher minimum input voltage excludes 1.5V–3.3V bus use cases	Choose for systems needing tighter 0.6V reference and integrated VCC LDO, accepting larger solution size.

Compared with MP2315DJ-LF-Z and TPS54821RHLR, the IR3841WMTRPBF uniquely combines 8A capability, 1.5V minimum input, integrated bootstrap diode, and Seq pin for tracking-making it optimal for space-constrained, multi-rail telecom and server PoL designs where input voltage flexibility and sequencing fidelity are critical.

Availability

IR3841WMTRPBF is available at Aetrix Electronics and suitable for server CPU core rails, storage controller I/O supplies, and embedded telecom baseband power delivery requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for IR3841WMTRPBF 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, and industrial control ICs, with leadership in silicon and silicon carbide power devices.

The IR3841W SupIRBuck™ product line targets high-density, high-efficiency point-of-load regulation in datacenter, networking, and embedded computing applications where integration, thermal performance, and programmability are essential.

FAQ

What is the maximum allowable input voltage for continuous operation?

The IR3841WMTRPBF supports continuous operation up to 16V input per recommended conditions. Absolute maximum VIN is 25V, but sustained operation above 16V risks exceeding thermal limits and violating SOA boundaries for internal MOSFETs. Derating is required above 12V at full 8A load due to increased conduction loss.

How is the overcurrent protection threshold set and verified?

The OCSet pin accepts a resistor between OCSet and SW to program current limit. Threshold scales with switching frequency: e.g., 23.6μA at 500kHz yields ~48.8A sensed current. Verification requires measuring OCSet current under fault condition using oscilloscope current probe on SW node and confirming hiccup behavior after 4096 cycles.

Does the device support negative output voltages or inverting configurations?

No. The IR3841WMTRPBF is a dedicated synchronous buck (step-down) regulator with fixed internal topology. Its block diagram, pin functions (e.g., Boot, SW, PGnd), and absolute maximum ratings confirm unidirectional operation only. Inverting or negative-output designs require external controller-based solutions.

What is the minimum output voltage achievable with external resistor divider?

The minimum regulated output is 0.7V, defined by the internal reference voltage. Using standard 1% resistors, a 0.7V output requires R1=0Ω (short) and R2=open (no divider), directly connecting FB to output. Lower voltages are not supported-the reference is trimmed and guaranteed only at 0.7V ±1% across temperature.

IR3841WMTRPBF 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)

IR3841WMTRPBF FAQ

1.How can I place an order for IR3841WMTRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IR3841WMTRPBF 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 IR3841WMTRPBF reliable?

The price and inventory of IR3841WMTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3841WMTRPBF is usually 5 days.

3.What payment methods are accepted for IR3841WMTRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3841WMTRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IR3841WMTRPBF?

IR3841WMTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IR3841WMTRPBF 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 IR3841WMTRPBF?

For technical support, including IR3841WMTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3841WMTRPBF requirements.

6.How does Aetrix verify that IR3841WMTRPBF is sourced from the original manufacturer or authorized distributors?

All IR3841WMTRPBF 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 IR3841WMTRPBF meets industry standards.

7.What is the process for return or replacement of IR3841WMTRPBF?

All IR3841WMTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3841WMTRPBF, 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 IR3841WMTRPBF part is unused and in its original packaging.

Return procedure for IR3841WMTRPBF:

1.Submit a request within 90 days.

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

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