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 IFX91041EJV33XUMA1

Name: IFX91041EJV33XUMA1
Brand: Infineon Technologies
SKU: IFX91041EJV33XUMA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: IFX91041EJV33XUMA1

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-SOIC (0.154", 3.90mm Width) Exposed Pad

Datasheet:: IFX91041EJV33XUMA1.pdf

Description:: IC REG BUCK 3.3V 1.8A DSO-8-27

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,235

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

Product details

Overview

IFX91041EJV33XUMA1 from Infineon Technologies is a monolithic 1.8A step-down (buck) DC/DC voltage regulator with fixed 3.3V output, ±2% output voltage tolerance at mid-load, 4.75–45V input range, and 370kHz switching frequency. It integrates a power DMOS transistor, feedforward PWM control, soft-start, and thermal shutdown-designed for industrial power rails in motor drives, PLC I/O modules, and sensor signal conditioning.

For engineers reviewing the IFX91041EJV33XUMA1 datasheet, IFX91041EJV33XUMA1 pinout, IFX91041EJV33XUMA1 application, or IFX91041EJV33XUMA1 equivalent, key selection criteria include its 3.3V fixed output accuracy, bootstrap gate drive architecture, synchronization capability, low shutdown current (<2µA), and operation over –40°C to +125°C junction temperature.

Technical Context

The IFX91041EJV33XUMA1 implements voltage-mode PWM regulation with integrated feedforward path active from 8.0V to 36V input, enabling fast line transient rejection. Its internal charge pump supports gate drive during low-V_IN/high-duty-cycle conditions, while bootstrap UVLO prevents unsafe gate drive when V_BDS drops below V_BUO + 3.3V.

It features a dedicated soft-start ramp generator (0.5ms typical ramp time), overcurrent protection with 2.2–3.6A peak limit, and thermal shutdown triggered at T_j > 175°C. The FB pin connects directly to the output capacitor for fixed-output versions, eliminating external divider components.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.3V ±2% (0.1–1.0A load); ±4% across full 1mA–1.8A range
Max Output Current	1.8A continuous; limited by thermal design and PCB copper area
Input Voltage Range	4.75V to 45V - supports wide industrial supply rails including 12V, 24V, and 36V systems
Switching Frequency	370kHz - enables use of compact 18–56µH inductors and 33–120µF output capacitors
Shutdown Current	<2µA - enables ultra-low-power standby in always-on industrial controllers
Junction Temp Range	–40°C to +125°C - qualified for extended industrial ambient environments
Thermal Resistance	R_thJA = 52K/W - requires exposed pad soldered to ≥2 inner-layer copper pour for full 1.8A rating

Pinout & Package

IFX91041EJV33XUMA1 is housed in PG-DSO-8-27: an 8-pin thermally enhanced SOIC package with exposed thermal pad (EP) on underside, requiring low-inductance connection to GND and heatsink plane.

Pin/Terminal	Circuit Role	Design Meaning
1 SYNC	Synchronization Input	Accepts external clock (≤5.5V) to align switching frequency; tie to GND if unused
2 GND	Ground Reference	Main power and signal return; must connect to EP and system GND plane with multiple vias
3 COMP	Loop Compensation Node	Connects to RC network for stability; sets crossover frequency and phase margin of voltage loop
4 FB	Feedback Input	Direct connection to output capacitor for 3.3V fixed version; no resistor divider needed
5 BDS	Bootstrap Supply Input	Drives high-side gate via external bootstrap capacitor between BDS and BUO
6 BUO	Buck Switch Output	Source of integrated DMOS; connects to cathode of catch diode and buck inductor
7 EN	Enable Input	Active-high logic input with internal pull-down; <2µA shutdown current when pulled low
8 VS	Supply Voltage Input	Main input rail (4.75–45V); decoupling capacitor required close to pin

Key Features

Feature	Design Value
Integrated Power DMOS Transistor	Eliminates external high-side switch; R_DS(on) ≤ 500mΩ reduces conduction loss and board space
Feedforward PWM Control	Improves line transient response by directly modulating duty cycle based on V_IN, reducing output deviation during input surges
Soft-Start Ramp Generator	0.5ms typical output voltage ramp limits inrush current and prevents overshoot during power-up or thermal recovery
Bootstrap UVLO Protection	Disables switching when V_BDS falls below V_BUO + 3.3V, preventing shoot-through and MOSFET overheating
Charge Pump Support	Activates only when V_IN is insufficient for bootstrap operation (e.g., V_IN ≈ V_OUT), ensuring reliable gate drive down to 4.75V input

Applications

Industrial Motor Drive Power Supply

Programmable Logic Controller (PLC) I/O Module

Use Scenario: Providing stable 3.3V bias for microcontrollers, ADCs, and digital isolators in servo amplifier boards operating from 24V bus.

IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 3.3V rail with high PSRR and fast transient response to handle encoder feedback bursts.

Use Value: Enables direct replacement of linear regulators, reducing heat sink size by >70% while maintaining noise-sensitive analog performance.

Use Scenario: Powering FPGA configuration circuitry and fieldbus transceivers in modular PLC backplanes with 24V or 36V input.

IC Role / Device Role / Timing Role: Fixed-output DC/DC converter supplying clean 3.3V to programmable logic and communication ICs under varying load and temperature.

Use Value: Delivers consistent regulation across –40°C to +125°C ambient without derating, supporting extended industrial lifecycle requirements.

Factory Automation Sensor Hub

Railway Onboard Control Unit

Use Scenario: Generating 3.3V for MEMS accelerometers, temperature sensors, and wireless transceivers in distributed IIoT edge nodes.

IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with low shutdown current, enabling battery-backed sleep modes.

Use Value: Achieves <2µA quiescent draw in shutdown-critical for energy harvesting and long-life battery operation.

Use Scenario: Powering safety-critical microcontrollers and watchdog circuits in train door control units powered from 36V nominal traction supply.

IC Role / Device Role / Timing Role: Robust buck regulator with overtemperature and overcurrent protection, meeting EN 50155 environmental compliance.

Use Value: Maintains regulation up to 45V input transients (e.g., load dump), eliminating need for upstream TVS clamping.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2678SD-3.3/NOPB	5A rating, 260kHz fixed frequency, no sync input, higher quiescent current (50µA)	Lacks synchronization and feedforward; less suitable for noise-sensitive or multi-rail synchronized systems	Choose for higher current headroom where thermal budget allows larger inductor/capacitor footprint
TPS54331DR	3A rating, adjustable output, 570kHz frequency, integrated compensation, no charge pump	Requires external feedback resistors; no bootstrap UVLO or charge pump support for low-V_IN operation	Prefer when output adjustability and smaller solution size outweigh need for robustness at ultra-low input differentials

Compared with LM2678SD-3.3/NOPB and TPS54331DR, IFX91041EJV33XUMA1 offers superior line transient immunity via feedforward, lower shutdown current, and built-in bootstrap supervision-making it optimal for harsh industrial environments where input stability and thermal reliability are critical.

Availability

IFX91041EJV33XUMA1 is available at Aetrix Electronics and suitable for industrial motor drives, PLC I/O modules, factory automation sensor hubs, and railway onboard control units requiring stable component supply across extended temperature and long product lifecycles.

Supply support for IFX91041EJV33XUMA1 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 electronics, and industrial control ICs, with global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.

The IFX91041 series belongs to Infineon's industrial-grade DC/DC regulator portfolio, designed specifically for ruggedized power conversion in factory automation, energy infrastructure, and transportation systems where high ambient temperature, wide input range, and functional safety margins are mandatory.

FAQ

What is the recommended minimum output capacitance for IFX91041EJV33XUMA1?

The datasheet specifies 33µF minimum output capacitance with ESR ≤ 0.3Ω for stable operation. Using 47µF–100µF low-ESR ceramic or polymer capacitors improves transient response and reduces output ripple below 20mV_PP at full load. Layout must minimize loop inductance between BUO, GND, and output capacitor.

Does IFX91041EJV33XUMA1 require external compensation components?

Yes-pin COMP requires an external RC network (typically 1–10kΩ resistor and 100–1000pF capacitor) to stabilize the voltage-mode control loop. The exact values depend on inductor value, output capacitance, and desired phase margin; Infineon Application Note AN2011-07 provides design equations and example calculations.

Can IFX91041EJV33XUMA1 operate with input voltage below 4.75V?

No-the absolute minimum input voltage is 4.75V per datasheet specification. Below this threshold, the internal bandgap reference and oscillator fail to start reliably, and bootstrap charging becomes insufficient. For sub-4.75V applications, consider Infineon's TLE727x family or external LDO pre-regulation.

Is the exposed thermal pad electrically connected internally?

Yes-the exposed pad (EP) is internally connected to GND and must be soldered to a dedicated GND copper pour with ≥4 thermal vias (0.3mm diameter) to achieve rated 1.8A output current and maintain R_thJA ≤ 52K/W. Leaving the pad unconnected degrades thermal performance by >40% and risks thermal shutdown under load.

IFX91041EJV33XUMA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width) Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Fixed

Number of Outputs:: 1

Voltage - Input (Min):: 4.75V

Voltage - Input (Max):: 45V

Voltage - Output (Min/Fixed):: 3.3V

Voltage - Output (Max):: -

Current - Output:: 1.8A

Frequency - Switching:: 370kHz

Synchronous Rectifier:: No

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PG-DSO-8-27

IFX91041EJV33XUMA1 FAQ

1.How can I place an order for IFX91041EJV33XUMA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for IFX91041EJV33XUMA1 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 IFX91041EJV33XUMA1 reliable?

The price and inventory of IFX91041EJV33XUMA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IFX91041EJV33XUMA1 is usually 5 days.

3.What payment methods are accepted for IFX91041EJV33XUMA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IFX91041EJV33XUMA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IFX91041EJV33XUMA1?

IFX91041EJV33XUMA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IFX91041EJV33XUMA1 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 IFX91041EJV33XUMA1?

For technical support, including IFX91041EJV33XUMA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IFX91041EJV33XUMA1 requirements.

6.How does Aetrix verify that IFX91041EJV33XUMA1 is sourced from the original manufacturer or authorized distributors?

All IFX91041EJV33XUMA1 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 IFX91041EJV33XUMA1 meets industry standards.

7.What is the process for return or replacement of IFX91041EJV33XUMA1?

All IFX91041EJV33XUMA1 units undergo pre-shipment inspection (PSI). If there is an issue with IFX91041EJV33XUMA1, 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 IFX91041EJV33XUMA1 part is unused and in its original packaging.

Return procedure for IFX91041EJV33XUMA1:

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…