Infineon Technologies IFX25401TBV50ATMA1

Overview

IFX25401TBV50ATMA1 from Infineon Technologies is a monolithic low-dropout linear voltage regulator delivering a fixed 5.0 V output at up to 400 mA, with ±2% output voltage accuracy, 250–500 mV dropout at 250 mA, and operation across –40 °C to +125 °C. It features enable control, reverse polarity protection, overtemperature shutdown, and current limiting-designed for battery-backed industrial systems requiring stable low-quiescent-power regulation.

For engineers reviewing the IFX25401TBV50ATMA1 datasheet, IFX25401TBV50ATMA1 pinout, IFX25401TBV50ATMA1 application, or IFX25401TBV50ATMA1 equivalent, key selection criteria include fixed 5 V output tolerance, thermal performance in PG-TO263-5, EN-controlled ultra-low shutdown current (<10 µA), and compatibility with ceramic output capacitors ≥22 µF.

Technical Context

The IFX25401TBV50ATMA1 implements an internal bandgap reference and error amplifier driving a pass transistor, with integrated saturation control and protection logic. Its adjustable version (IFX25401TBV) uses external resistive feedback on VA, but this variant fixes output at 5.0 V via internal resistor network-VA pin is NC or GND-tied.

Protection circuitry includes foldback current limiting (400–1100 mA trip range), thermal shutdown at ~150 °C junction, and reverse polarity blocking. Input voltage range is 4.5–40 V, with PSRR of 54 dB at 100 Hz and load regulation of ≤35 mV from 5–400 mA.

Key Specifications

Pinout & Package

IFX25401TBV50ATMA1 is housed in PG-TO263-5 (D²PAK) package with exposed thermal slug connected internally to GND. Pin 1: Input (I); Pin 2: Enable (EN); Pin 3: Ground (GND); Pin 4: Not Connected (NC) - VA pin is unused in 5 V fixed version; Pin 5: Output (Q). Heat slug must be soldered to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLE42754G and MCP1703T-5002E/MB, IFX25401TBV50ATMA1 uniquely combines 400 mA output, EN control, reverse polarity protection, and D²PAK thermal performance-making it optimal for industrial modules requiring robustness and programmable power management.

Availability

IFX25401TBV50ATMA1 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical patient monitoring sensors, and building automation controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for IFX25401TBV50ATMA1 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, and industrial control ICs, with global manufacturing and quality certification to ISO/TS 16949 and ISO 14001.

The IFX25401 product line delivers ruggedized LDO regulators for harsh industrial environments-designed specifically for battery-backed, wide-input, thermally demanding applications where reliability outweighs cost sensitivity.

FAQ

What is the function of Pin 4 (VA) on IFX25401TBV50ATMA1?

Pin 4 is labeled VA (Voltage Adjust) but is not connected internally in the IFX25401TBV50ATMA1 fixed-5V variant. It may be left floating or tied to GND per PCB layout guidelines. This differs from the adjustable IFX25401TBV, where VA accepts external resistor feedback to set output voltage between 2.5 V and 20 V.

Can IFX25401TBV50ATMA1 operate with an input voltage below 5 V?

No. The minimum input voltage is 4.5 V for proper regulation, and the dropout voltage is 250–500 mV at 250 mA. Therefore, stable 5.0 V output requires VI ≥ 5.25 V under typical load. Operation below 4.5 V is outside functional range and may cause unregulated output or shutdown.

Is IFX25401TBV50ATMA1 qualified for automotive use?

No. The datasheet explicitly states IFX25401 is not qualified for automotive or transportation applications. Infineon recommends its TLx family (e.g., TLE4275, TLS850) for AEC-Q100-compliant automotive designs. IFX25401TBV50ATMA1 targets industrial, medical, and building automation systems only.

What output capacitor specifications are mandatory for stability?

A minimum 22 µF ceramic capacitor with ESR ≤3 Ω at 10 kHz is required between Q and GND, placed adjacent to the IC pins. This value accounts for worst-case ±30% capacitance tolerance. Using lower capacitance or higher ESR risks oscillation or poor transient response, especially under load steps.