Infineon Technologies TLE4251DNTMA1

Overview

TLE4251DNTMA1 from Infineon Technologies is a monolithic low-drop voltage tracker IC in PG-TO252-5-11 package, designed for automotive sensor supply under harsh conditions. It delivers 400 mA output current with ±0.2% tracking accuracy (at ≤300 mA load), operates from 4 V to 40 V input, and features enable-controlled standby mode with ≤2 µA quiescent current.

For engineers reviewing the TLE4251DNTMA1 datasheet, TLE4251DNTMA1 pinout, TLE4251DNTMA1 application, or TLE4251DNTMA1 equivalent, key selection criteria include tracking tolerance (±0.2% at 300 mA), thermal protection (Tj = −40 °C to 150 °C), reverse-polarity immunity, AEC-Q100 qualification, and PG-TO252-5-11 package compatibility with high-power automotive PCB layouts.

Technical Context

The TLE4251DNTMA1 implements an adjustable reference-tracking architecture: output voltage VQ follows external reference voltage applied to ADJ pin via resistor divider, enabling precise proportional regulation (e.g., 5 V main rail → 3.3 V sensor rail). Internal saturation control and thermal shutdown circuitry enforce safe operation during overload or short-circuit events.

It uses high-side sensing and feedback error amplification to maintain tracking accuracy across wide input (6–40 V) and temperature (−40 °C to 150 °C) ranges. Enable (EN) is high-active, requiring ≥2 V to activate and ≤0.5 V to enter <2 µA standby mode - critical for battery-sensitive automotive modules.

Key Specifications

Pinout & Package

Package: PG-TO252-5-11 (DPAK variant with exposed thermal pad, 5-pin SMD).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-drop voltage tracker applications.

Compared with TLE4251DNTMA1, TLE4278GATMA1 trades adjustability and precision for higher current and simpler layout, while TLV71733PDQNR lacks automotive qualification, reverse protection, and tracking capability - making TLE4251DNTMA1 uniquely suited for AEC-Q100-compliant, reference-proportional sensor supplies.

Availability

TLE4251DNTMA1 is available at Aetrix Electronics and suitable for engine control units, transmission control modules, ADAS sensor nodes, and electric power steering systems requiring stable component supply with full automotive qualification and long-term lifecycle support.

Supply support for TLE4251DNTMA1 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 aligned to ISO/TS 16949.

The TLE4251 belongs to Infineon's automotive linear regulator product line, engineered specifically for reliable, protected, and precision-tracking power delivery to sensors and microcontrollers in demanding vehicle environments.

FAQ

What is the minimum input voltage required for stable 5 V tracking?

The TLE4251DNTMA1 requires input voltage VI ≥ V_ADJ + V_DR, where V_DR is 280–520 mV at 300 mA. For 5 V tracking, minimum VI is 5.28 V. At light loads (<10 mA), dropout drops below 200 mV, allowing operation down to ~5.1 V. Input must exceed 4 V per operating range specification.

Can the ADJ pin be connected directly to a 5 V reference without a resistor divider?

Yes - direct connection of ADJ to a stable 5 V reference sets V_Q = 5 V ±0.2%. This configuration is explicitly supported and commonly used for unity-gain tracking. Ensure the reference source can sink ≤0.5 µA and remains within 2.5–40 V per operating limits.

Is external output capacitance mandatory, and what are the ESR constraints?

Yes - a minimum 22 µF output capacitor with ESR ≤3 Ω at 10 kHz is mandatory for stability and transient response. Tantalum or low-ESR ceramic capacitors are recommended. Omitting or undersizing C_Q causes oscillation, poor load regulation, and potential thermal shutdown during step-load events.

Does TLE4251DNTMA1 support parallel operation for higher current?

No - the TLE4251DNTMA1 is not designed for parallel operation. Its tracking architecture relies on single-point feedback; paralleling introduces mismatch-induced current hogging and instability. For >400 mA, select higher-current alternatives like TLE4271-2 or discrete FET-based trackers with current-sharing circuitry.