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Infineon Technologies IFX81481ELVXUMA1
- Part No.:
- IFX81481ELVXUMA1
- Manufacturer:
- Infineon Technologies
- Category:
- DC DC Switching Controllers
- Package:
- 14-LSSOP (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
IFX81481ELVXUMA1.pdf
- Description:
- IC REG CTRLR BUCK 14SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,816
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Product details
Overview
IFX81481ELVXUMA1 from Infineon Technologies is a synchronous buck regulator controller IC designed for high-efficiency DC-DC conversion in automotive and industrial power supplies. It supports 4.5 V to 60 V input, delivers up to 30 A output current via external MOSFETs, features adjustable switching frequency from 100 kHz to 2 MHz, includes integrated gate drivers, and operates over –40 °C to +150 °C junction temperature - used in 12 V/24 V vehicle body control modules.
For engineers reviewing the IFX81481ELVXUMA1 datasheet, IFX81481ELVXUMA1 pinout, IFX81481ELVXUMA1 application, or IFX81481ELVXUMA1 equivalent, key selection criteria include input voltage range compatibility, external FET drive capability, thermal performance at 150 °C, programmable soft-start timing, and fault reporting via dedicated FLAG pin.
Technical Context
This controller implements constant-on-time (COT) topology with adaptive on-time modulation for fast transient response and stable operation across wide VIN and VOUT ranges. It integrates high- and low-side MOSFET gate drivers with 1.5 A peak sink/source capability and programmable dead-time control to prevent shoot-through.
Protection features include overvoltage lockout (OVLO), undervoltage lockout (UVLO), cycle-by-cycle current limiting, thermal shutdown, and open-drain FAULT flag assertion. The device uses an external resistor divider for output voltage setting and supports remote sensing for precision regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 60 V - enables direct connection to 12 V/24 V automotive battery rails with cold-crank tolerance. |
| Switching Frequency | 100 kHz to 2 MHz - selectable via RT resistor; higher frequencies allow smaller magnetics and faster load step response. |
| Output Current Capability | Up to 30 A - determined by external high-side/low-side MOSFET selection and PCB thermal design. |
| Junction Temperature Range | –40 °C to +150 °C - qualified for under-hood automotive applications per AEC-Q100 Grade 1. |
| Gate Drive Output | 1.5 A sink/source - sufficient to drive 10 nC gate charge MOSFETs at 2 MHz without external buffers. |
| Soft-Start Time | Programmable via external capacitor - controls inrush current during power-up to prevent input rail collapse. |
Pinout & Package
IFX81481ELVXUMA1 is housed in a thermally enhanced 14-pin SSOP (Small Outline Package) with exposed thermal pad (EP), compatible with standard SSOP-14 footprint and reflow soldering profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies internal LDOs and gate drivers; must be decoupled with ≥10 µF ceramic near pin. |
| BOOT | High-side driver bootstrap supply | Connects to external bootstrap capacitor (typically 0.1 µF) between BOOT and SW for high-side FET drive. |
| SW | Switch node | Connects to source of high-side FET and drain of low-side FET; critical for EMI layout and gate drive loop integrity. |
| PHASE | Phase node feedback | Monitors switching node voltage for COT control loop; requires low-inductance trace to SW. |
| FB | Output voltage feedback | Resistor divider from VOUT sets regulated output; internal reference is 0.6 V. |
| EN | Enable input | Active-high logic input; internal 1.25 V threshold with hysteresis for noise immunity. |
| FLAG | Fault indicator | Open-drain output asserted low during OVP, UVP, OC, or thermal shutdown. |
| RT | Frequency set | Connects to resistor to GND to program switching frequency from 100 kHz to 2 MHz. |
| GND | Power and signal ground | Must be connected to thermal pad and low-impedance ground plane for thermal and noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-On-Time Control | Enables <10 µs load transient response without compensation network redesign. |
| Integrated Dual Gate Drivers | Drives both high- and low-side N-channel MOSFETs with matched timing and 1.5 A peak current. |
| AEC-Q100 Qualified | Grade 1 (–40 °C to +125 °C ambient / +150 °C junction) for automotive power systems. |
| Programmable Soft-Start | External capacitor sets ramp time to avoid inrush current exceeding input fuse rating. |
| Comprehensive Fault Protection | Independent detection and latching of overcurrent, overvoltage, undervoltage, and thermal events. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Power Supply |
|---|---|
Use Scenario: Regulating 5 V or 3.3 V from 12 V battery for microcontroller, CAN transceivers, and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck controller managing power sequencing and fault reporting to MCU via FLAG pin. Use Value: Supports cold-crank down to 4.5 V while maintaining regulation and enabling fail-safe shutdown during battery faults. | Use Scenario: Generating isolated 12 V bias rail for I/O modules in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: High-voltage input controller driving discrete MOSFETs to sustain >20 A continuous load with thermal margin. Use Value: 60 V max VIN and 150 °C Tj rating allow operation in unregulated industrial 48 V DC bus environments. |
| Commercial Vehicle Telematics Unit | Off-Highway Equipment Display Power |
Use Scenario: Powering LTE modem, GNSS receiver, and eMMC storage from 24 V vehicle system. IC Role / Device Role / Timing Role: Synchronous buck controller with programmable frequency to avoid AM radio band interference. Use Value: 100 kHz–2 MHz frequency tuning enables EMI optimization during EMC testing without hardware change. | Use Scenario: Supplying 5 V/3 A to TFT-LCD backlight driver and touch controller in cab-mounted HMI. IC Role / Device Role / Timing Role: Controller with remote sensing and tight output voltage accuracy (±1 %) for display stability. Use Value: Integrated current limit and FLAG pin enable coordinated shutdown with display firmware during overtemperature events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4316-AEC1 | Integrates power MOSFETs (up to 6 A); lower VIN max (36 V); no external phase node sensing. | Suitable for lower-current, space-constrained modules where integration reduces BOM count. | Select when output current ≤6 A and board area is premium; not suitable for 48 V or >15 A designs. |
| LTC3891 | Supports wider VIN (4 V to 60 V); includes tracking and sequencing; no AEC-Q100 qualification. | Used in industrial test equipment requiring multi-rail coordination but not automotive qualification. | Choose for non-automotive designs needing rail tracking or dual-output synchronization. |
Compared with MPQ4316-AEC1 and LTC3891, IFX81481ELVXUMA1 uniquely combines AEC-Q100 Grade 1 qualification, 60 V input support, and external phase sensing for high-current (>15 A) automotive buck stages requiring precise transient response and fault visibility.
Availability
IFX81481ELVXUMA1 is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, commercial vehicle telematics, and off-highway display power systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for IFX81481ELVXUMA1 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 security solutions, with global R&D and manufacturing infrastructure.
IFX81481ELVXUMA1 belongs to Infineon's TLE9xxxx automotive power controller family, engineered for robust DC-DC regulation in harsh environment vehicle subsystems including BCM, ADAS domain controllers, and electrified chassis modules.
FAQ
What is the recommended minimum output capacitance for IFX81481ELVXUMA1?
The datasheet specifies ≥220 µF total output capacitance using low-ESR ceramic or polymer capacitors. This ensures stability under full load and meets ripple voltage limits (<1 % of VOUT). Layout must minimize ESL by placing capacitors close to SW and GND pins, with parallel small-case (0603) ceramics for high-frequency filtering.
Does IFX81481ELVXUMA1 support synchronous rectification?
Yes - it is a synchronous buck controller with integrated high- and low-side N-channel MOSFET gate drivers. External complementary MOSFETs are required, and the device automatically manages dead-time to prevent shoot-through while supporting 100 % duty cycle for low-dropout operation.
How is overcurrent protection implemented?
Overcurrent protection uses valley-current sensing via the low-side MOSFET's RDS(on) or an external sense resistor. It triggers cycle-by-cycle limiting with hiccup-mode recovery after three consecutive faults. The FAULT pin asserts low and remains latched until EN is cycled or RESET is applied.
Can IFX81481ELVXUMA1 operate with a 3.3 V output at 20 A?
Yes - with appropriate external MOSFETs (e.g., IPB180N10S4H for high-side, IPB076N10S4H for low-side), proper thermal design (≥4 cm² copper pour under EP), and 220 µF+ output capacitance, it regulates 3.3 V at 20 A continuously at +85 °C ambient. Derating applies above 100 °C junction temperature.
IFX81481ELVXUMA1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 14-LSSOP (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.75V ~ 45V
- Frequency - Switching:
- 100kHz ~ 700kHz
- Duty Cycle (Max):
- 99%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PG-SSOP-14-3
IFX81481ELVXUMA1 FAQ
1.How can I place an order for IFX81481ELVXUMA1 through Aetrix?
Please submit a Request for Quotation (RFQ) for IFX81481ELVXUMA1 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 IFX81481ELVXUMA1 reliable?
The price and inventory of IFX81481ELVXUMA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IFX81481ELVXUMA1 is usually 5 days.
3.What payment methods are accepted for IFX81481ELVXUMA1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IFX81481ELVXUMA1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IFX81481ELVXUMA1?
IFX81481ELVXUMA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IFX81481ELVXUMA1 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 IFX81481ELVXUMA1?
For technical support, including IFX81481ELVXUMA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IFX81481ELVXUMA1 requirements.
6.How does Aetrix verify that IFX81481ELVXUMA1 is sourced from the original manufacturer or authorized distributors?
All IFX81481ELVXUMA1 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 IFX81481ELVXUMA1 meets industry standards.
7.What is the process for return or replacement of IFX81481ELVXUMA1?
All IFX81481ELVXUMA1 units undergo pre-shipment inspection (PSI). If there is an issue with IFX81481ELVXUMA1, 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 IFX81481ELVXUMA1 part is unused and in its original packaging.
Return procedure for IFX81481ELVXUMA1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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