Infineon Technologies IFX54441LDV33XUMA1

Overview

IFX54441LDV33XUMA1 from Infineon Technologies is a fixed-output 3.3 V, 300 mA low-dropout linear regulator in PG-TSON-10 exposed pad package. It delivers ultra-low noise (24 µVRMS, 10 Hz–100 kHz), 270 mV dropout at full load, 30 µA quiescent current, and ±2.5% output accuracy across temperature and load - designed for radar modules and image sensor power rails where supply integrity is critical.

For engineers reviewing the IFX54441LDV33XUMA1 datasheet, IFX54441LDV33XUMA1 pinout, IFX54441LDV33XUMA1 application, or IFX54441LDV33XUMA1 equivalent, key selection criteria include low-noise operation with optional 0.01 µF BYP capacitor, reverse-battery protection without external diodes, Kelvin sense capability for remote load regulation, and compatibility with ceramic, tantalum, or aluminum output capacitors ≥3.3 µF.

Technical Context

The IFX54441LDV33XUMA1 integrates a precision 1.22 V bandgap reference, error amplifier, thermal shutdown, and foldback current limiting. Its architecture supports Kelvin sensing via SENSE pin (fixed version) to compensate for PCB trace IR drop, enabling stable regulation at point-of-load.

It features internal reverse-battery protection that blocks conduction when VIN < GND, eliminating need for external series diode. The EN pin accepts 5 V logic or open-collector drive, with 1 µA typical input current and mandatory pull-up if not driven - ensuring reliable shutdown control in battery-backed systems.

Key Specifications

Pinout & Package

IFX54441LDV33XUMA1 uses PG-TSON-10 exposed pad package (3.0 mm × 3.0 mm × 0.85 mm), with thermal pad (Pin 11) soldered to PCB ground for enhanced thermal dissipation (R_θJA ≈ 60°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLE42754G and MCP1703T-3302E/MB, IFX54441LDV33XUMA1 uniquely combines 3.3 V fixed output, 24 µVRMS noise, Kelvin sensing, and reverse-battery protection - making it the only choice among the three for high-fidelity analog power in ungrounded or field-serviceable battery systems.

Availability

IFX54441LDV33XUMA1 is available at Aetrix Electronics and suitable for radar signal chain power, CMOS image sensor bias, and industrial microcontroller core supply requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for IFX54441LDV33XUMA1 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 ICs, and industrial control solutions, with global manufacturing and quality certification to ISO/TS 16949 and IATF 16949.

The IFX54441 belongs to Infineon's wide-input, low-noise LDO product line - engineered specifically for battery-powered instrumentation, radar, and imaging systems demanding precision regulation under variable input and thermal conditions.

FAQ

Can IFX54441LDV33XUMA1 operate with a 1.8 V input?

Yes. The device supports input voltages from 1.8 V to 20 V. At 1.8 V input, it regulates 3.3 V output only if the dropout condition is met - but since 1.8 V < 3.3 V, regulation is impossible below ~3.57 V input. Thus, 1.8 V is the absolute minimum rating, not functional minimum; actual minimum input is V_OUT + V_DO = 3.57 V.

Is the SENSE pin required for basic operation?

No. For standard PCB layouts with short traces (<50 mm) between regulator and load, SENSE can be shorted to OUT. It becomes essential only when trace resistance causes >10 mV drop - e.g., in flex cables or remote loads - where connecting SENSE directly to the load improves regulation accuracy to ±2.5%.

What happens if the BYP pin is left unconnected?

Leaving BYP unconnected results in nominal 45 µVRMS output noise (typical). To achieve the specified 24 µVRMS, a 0.01 µF ceramic capacitor must be placed between BYP and OUT. The BYP pin is internally clamped to ±0.6 V, so no external protection is needed - but floating BYP yields higher noise.

Does IFX54441LDV33XUMA1 require an input capacitor?

An input capacitor is recommended when the device is located >15 cm from the main bulk capacitor or when source impedance is high (e.g., long battery leads). A 1–10 µF ceramic capacitor at IN suppresses high-frequency noise and stabilizes transient response - especially critical in radar pulsed-load applications.