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

Infineon Technologies IR3841MTR1PBF

Name: IR3841MTR1PBF
Brand: Infineon Technologies
SKU: IR3841MTR1PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IR3841MTR1PBF

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 15-PowerVQFN

Datasheet:: IR3841MTR1PBF.pdf

Description:: IC REG BUCK ADJ 8A PQFN

Quantity:: RFQ Add To RFQ list

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Inventory:2,020

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Product details

Overview

IR3841MTR1PBF from Infineon Technologies is a highly integrated 8A synchronous buck regulator with co-packaged high- and low-side MOSFETs, PWM controller, and bootstrap diode. It delivers precision 0.7V ±1% output voltage across 1.5–16V input, supports programmable 225–1650kHz switching, and enables stable point-of-load regulation in space-constrained server and telecom power rails.

For engineers reviewing the IR3841MTR1PBF datasheet, IR3841MTR1PBF pinout, IR3841MTR1PBF application, or IR3841MTR1PBF equivalent, key selection criteria include its 8A continuous load capability, thermal shutdown at 140°C, PGood open-drain status signaling, and sequenced startup via the Seq pin for multi-rail systems.

Technical Context

The IR3841 implements a current-mode control architecture with an internal error amplifier (GBWP = 20–40 MHz, slew rate = 7–20 V/μs) and programmable soft-start via external capacitor on SS/SD. Its high-bandwidth compensation path and fixed off-time of 130–200 ns enable fast transient response under dynamic load steps.

It integrates dual MOSFETs (R_DS(on) = 16.7/8.7 mΩ typ.) and supports tracking applications through the Seq pin, where two external resistors configure simultaneous power-up sequencing with other regulators. The bootstrap diode eliminates need for external charge-pump components.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	Continuous 8A - supports high-density CPU/GPU core rail delivery without external current sharing.
Input Voltage Range	1.5V to 16V - compatible with 3.3V, 5V, 12V intermediate bus architectures.
Output Voltage Range	0.7V to 0.9×V_IN - enables sub-1V core supplies with ±1% reference accuracy over -40°C to +125°C.
Switching Frequency	225 kHz to 1.65 MHz - adjustable via RT resistor; higher frequencies reduce inductor size but increase switching loss.
Efficiency	>96% peak - achieved via low R_DS(on) MOSFETs and integrated bootstrap diode minimizing conduction and gate drive losses.
Thermal Protection	140°C shutdown with 20°C hysteresis - prevents latch-up during sustained overload or airflow failure.
PGood Threshold	83–93% of V_FB - provides accurate power-good assertion for system sequencing and fault detection.

Pinout & Package

IR3841MTR1PBF uses a 5mm × 6mm Power QFN package with 0.9 mm 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	Configures synchronized startup 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 V_OUT; determines feedback loop stability and accuracy.
3 Comp	Error amplifier output	Drives external RC compensation network to tune phase margin and transient response.
4 & 15 GND	Signal ground	Reference return for internal bias, error amp, and logic; must be separated from PGND for noise immunity.
5 Rt	Frequency set input	Resistor-to-GND sets oscillator frequency; 9.31kΩ yields ~1.5MHz, 28.7kΩ yields ~500kHz.
6 SS/SD	Soft-start/shutdown	Capacitor-to-GND sets ramp time; pulled below 0.3V to force immediate shutdown.
7 OCSet	Over-current threshold	Resistor-to-SW sets hiccup-mode current limit; value scales linearly with target I_OUT trip point.
8 PGood	Power-good status	Open-drain output asserted when V_OUT reaches 83–93% of V_FB; requires external pull-up to VCC.
9 VCC	Bias supply input	Powers internal logic and gate drivers; requires ≥1μF ceramic capacitor to PGND for stability.
10 PGND	Power ground	Return path 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 dv/dt switching waveform.
12 VIN	Main input supply	Accepts 1.5–16V DC; feeds high-side MOSFET and internal LDO for VCC generation.
13 Boot	Bootstrap supply	0.1μF capacitor to SW provides gate drive voltage for high-side FET; integrated diode eliminates external component.
14 Enable	Startup control	UVLO thresholds (1.14–1.36V start, 0.9–1.06V stop) allow precise turn-on sequencing with external resistor divider.

Key Features

Feature	Design Value
Integrated MOSFETs + Controller	Eliminates discrete driver and external FET selection; reduces BOM count and layout area by >40% vs. controller-only solutions.
Programmable Hiccup OCP	Auto-retry protection limits thermal stress during short-circuit events without latching off permanently.
Enhanced Pre-Bias Start-up	Allows safe startup into pre-biased output rails-critical for hot-swap and multi-rail systems with staggered power sequencing.
Tracking Sequencing (Seq pin)	Enables voltage-ramping coordination with companion regulators using simple resistor networks-no external timing IC required.
High-Accuracy Reference	0.7V ±1% over temperature ensures tight output regulation for modern sub-1V ASIC/FPGA cores.

Applications

Server VR12/VR13 Core Rails

Storage Controller Power

Use Scenario: Delivering tightly regulated 0.8–1.2V at up to 8A to x86 CPU or AI accelerator cores in 1U rack servers.

IC Role / Device Role / Timing Role: Primary point-of-load regulator with PGood signaling for BIOS handoff and thermal throttling coordination.

Use Value: 96% efficiency minimizes heat density in constrained airflow environments; Seq pin enables synchronized rail bring-up with memory and I/O supplies.

Use Scenario: Powering NVMe SSD controllers and PCIe switch logic requiring fast transient response and low-noise 1.8V/3.3V rails.

IC Role / Device Role / Timing Role: Secondary buck regulator with soft-start and hiccup OCP to prevent data corruption during hot-plug insertion.

Use Value: Pre-bias start-up avoids output collapse when SSD is inserted into powered backplane; 1.5MHz operation allows <10μH inductors for compact layout.

Embedded Telecom Line Cards

Distributed PoL in Industrial PLCs

Use Scenario: Generating isolated 1.0V and 1.8V supplies for DSPs and SerDes in carrier-grade baseband units operating at -40°C to +85°C.

IC Role / Device Role / Timing Role: High-reliability buck converter with thermal shutdown and wide junction temp range (-40°C to +125°C).

Use Value: 140°C thermal shutdown with 20°C hysteresis prevents irreversible damage during fan failure; RoHS/halogen-free compliance meets telco environmental specs.

Use Scenario: Providing independent 0.9V FPGA core and 3.3V I/O rails in modular PLC backplanes with mixed-voltage requirements.

IC Role / Device Role / Timing Role: Programmable sequencer via Seq and Enable pins to enforce strict power-up order across multiple FPGAs and ADCs.

Use Value: Dual UVLO thresholds on Enable pin allow staged activation; PGood outputs feed FPGA configuration state machines for deterministic boot.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2451DT-LF-Z	4A rated, 3.3–36V input, no integrated bootstrap diode, requires external high-side driver.	Limited to lower-current applications; lacks Seq pin and pre-bias start-up.	Select when cost sensitivity outweighs current capability and sequencing needs.
TPS54821RHLR	8A rated, 4.5–20V input, integrated FETs, but no Seq pin or hiccup OCP; uses external bootstrap capacitor only.	Supports similar load levels but lacks multi-rail coordination features and enhanced fault recovery.	Prefer when TI ecosystem integration (PMBus, WEBENCH) is prioritized over hardware-based sequencing.

Compared with MP2451DT-LF-Z and TPS54821RHLR, the IR3841MTR1PBF uniquely combines 8A capacity, integrated bootstrap diode, Seq-based tracking, and hiccup-mode OCP-making it optimal for thermally dense, multi-rail telecom and server designs requiring autonomous fault management.

Availability

IR3841MTR1PBF is available at Aetrix Electronics and suitable for server VR12/VR13 core rails, embedded telecom line cards, and distributed point-of-load power architectures requiring stable component supply, long-term lifecycle support, and validated thermal performance.

Supply support for IR3841MTR1PBF 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 MCUs, and industrial control ICs, with global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.

The IR3841 belongs to Infineon's SupIRBuck™ family-designed specifically for high-efficiency, space-constrained DC/DC conversion in computing, networking, and storage infrastructure where integration, thermal robustness, and multi-rail coordination are critical.

FAQ

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

The IR3841MTR1PBF requires ≥220μF total output capacitance with ≤5mΩ ESR for stable 8A operation at 1.0V output. This typically comprises four 47μF/6.3V X5R ceramic capacitors placed close to the SW and PGND pins, plus one 100μF/6.3V polymer capacitor for bulk energy storage and low-frequency ripple suppression.

Can the IR3841MTR1PBF operate with an input voltage below 1.5V?

No. The absolute minimum input voltage is 1.5V per datasheet specifications. Operation below this level risks failure to initiate switching, insufficient gate drive for the high-side MOSFET, and violation of the bootstrap diode forward voltage requirement. Input voltages below 1.5V are outside guaranteed operational range and not characterized.

How does the Seq pin enable voltage tracking between multiple IR3841 devices?

The Seq pin accepts an external voltage divider that sets a reference for the internal tracking comparator. When used across multiple IR3841s, connecting their Seq pins together with matched dividers forces identical ramp rates on all FB nodes, ensuring output voltages rise proportionally-enabling precise 1:1 or scaled tracking without external op-amps or DACs.

Is the integrated bootstrap diode sufficient for all operating conditions?

Yes-the integrated bootstrap diode is rated for 30mA forward current and 180–470mV forward voltage at 25°C, fully supporting the gate charge requirements of the co-packaged high-side MOSFET across the full 225kHz–1.65MHz frequency range and -40°C to +125°C junction temperature. No external diode is needed or recommended.

IR3841MTR1PBF 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)

IR3841MTR1PBF FAQ

1.How can I place an order for IR3841MTR1PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IR3841MTR1PBF 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 IR3841MTR1PBF reliable?

The price and inventory of IR3841MTR1PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3841MTR1PBF is usually 5 days.

3.What payment methods are accepted for IR3841MTR1PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3841MTR1PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IR3841MTR1PBF?

IR3841MTR1PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IR3841MTR1PBF 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 IR3841MTR1PBF?

For technical support, including IR3841MTR1PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3841MTR1PBF requirements.

6.How does Aetrix verify that IR3841MTR1PBF is sourced from the original manufacturer or authorized distributors?

All IR3841MTR1PBF 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 IR3841MTR1PBF meets industry standards.

7.What is the process for return or replacement of IR3841MTR1PBF?

All IR3841MTR1PBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3841MTR1PBF, 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 IR3841MTR1PBF part is unused and in its original packaging.

Return procedure for IR3841MTR1PBF:

1.Submit a request within 90 days.

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

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