Infineon Technologies IFX54441LDV50XUMA1

Overview

IFX54441LDV50 from Infineon Technologies is a micropower, low-noise, wide-input-range LDO voltage regulator delivering 300mA at fixed 5.0V output with 290mV dropout, 42µVRMS noise (10Hz–100kHz), and 30µA quiescent current. It features reverse battery protection, Kelvin sense capability, and operates from 5.5V to 20V input in PG-TSON-10 exposed pad package-designed for radar front-ends and image sensor power rails.

For engineers reviewing the IFX54441LDV50 datasheet, IFX54441LDV50 pinout, IFX54441LDV50 application, or IFX54441LDV50 equivalent, key selection criteria include low-noise performance under transient load, thermal resistance (R_thJA = 53 K/W typical), SENSE pin implementation for remote sensing, and compatibility with ceramic, tantalum, or aluminum output capacitors ≥3.3µF.

Technical Context

The IFX54441LDV50 integrates a precision bandgap reference, error amplifier, and saturation-controlled pass transistor to maintain regulation across 5.5–20V input while supporting load currents up to 300mA. Its internal architecture includes dedicated reverse-battery protection circuitry and thermal shutdown that activates at T_j ≥150°C.

Kelvin sensing via the SENSE pin enables accurate regulation despite PCB trace resistance between OUT and load, while the BYP pin accepts a 0.01µF capacitor to reduce reference noise and achieve 42µVRMS output noise. The EN pin supports logic-level enable/disable with <1µA leakage and requires tie-to-VIN if unused.

Key Specifications

Pinout & Package

IFX54441LDV50 is housed in PG-TSON-10 exposed pad package (3mm × 3mm, 0.5mm pitch), requiring soldering of the exposed thermal pad (Pin 11) directly to PCB ground plane and electrical connection to Pin 6 (GND) for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise LDO applications.

Compared with TLE42744G and MCP1703T-5002E/MB, IFX54441LDV50 uniquely balances 300mA delivery, 42µVRMS noise, reverse-battery robustness, and Kelvin sensing in a 3×3mm exposed-pad package-making it optimal for space-constrained, noise-sensitive industrial radar and imaging systems not requiring AEC-Q100 certification.

Availability

IFX54441LDV50 is available at Aetrix Electronics and suitable for radar front-end power, CMOS image sensor bias, and microcontroller core supply requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for IFX54441LDV50 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 ISO 14001.

The IFX54441 series belongs to Infineon's wide-input, low-noise LDO family designed specifically for noise-sensitive analog subsystems in industrial radar, imaging, and instrumentation-emphasizing precision regulation, fault resilience, and thermal efficiency over cost-optimized consumer-grade alternatives.

FAQ

Can IFX54441LDV50 operate with an input voltage below 5.5V?

No. The device requires a minimum input voltage of 5.5V to maintain regulation at 5.0V output due to its 290mV dropout specification. At lower inputs, output voltage collapses linearly with VIN. Operation below 5.5V is outside functional range and not guaranteed per datasheet Section 4.2.

Is the SENSE pin mandatory for basic operation?

No. The SENSE pin can be directly connected to the OUT pin for standard configurations where PCB trace resistance is negligible (<10mΩ). It becomes mandatory only when precise load regulation is required across longer traces or flex cables-otherwise, omitting Kelvin connection has no impact on stability or basic functionality.

What is the maximum allowable output capacitance?

The datasheet specifies a minimum of 3.3µF but does not define a maximum. Larger values (e.g., 47µF–100µF) are permitted and beneficial for transient load suppression, provided the capacitor's voltage rating exceeds 6.3V and ESR remains low. Stability is maintained regardless of capacitance value within standard aluminum/tantalum/ceramic types.

Does IFX54441LDV50 require an input capacitor?

An input capacitor is recommended-not strictly required-but strongly advised when the device is located >15cm from the main bulk capacitor or when source impedance is high (e.g., long battery leads). A 1–10µF ceramic capacitor placed near the IN pin improves transient response and prevents oscillation under dynamic load conditions.