Infineon Technologies TLD1124ELXUMA1

Overview

TLD1124ELXUMA1 from Infineon Technologies is a single-channel high-side LED current source driver IC designed for automotive exterior and interior lighting. It delivers up to 360 mA output current with ±7% accuracy at RSET = 12 kΩ, operates from 5.5 V to 40 V supply, and integrates open-load and short-to-GND diagnosis, thermal protection, and reverse-polarity protection. It drives red LED strings (e.g., 3×) in tail/brake light modules.

For engineers reviewing the TLD1124ELXUMA1 datasheet, TLD1124ELXUMA1 pinout, TLD1124ELXUMA1 application, or TLD1124ELXUMA1 equivalent, key selection criteria include high-side current regulation stability across battery voltage variation (8–18 V), diagnosis enable (DEN) control logic, ST pin status signaling, thermal derating behavior (RthJA ≤ 45 K/W on 2s2p board), and PG-SSOP-14 exposed-pad thermal management.

Technical Context

The TLD1124ELXUMA1 implements a linear high-side current source architecture with internal power stage and integrated thermal shutdown. Its output current is set via external resistor (IN_SET) and remains stable against load and supply voltage fluctuations due to closed-loop regulation.

Diagnosis functions are controlled independently via DEN pin voltage thresholds (VDEN(act) ≈ VS − 6 V), while status reporting occurs on ST pin using open-drain logic. Protection includes undervoltage lockout (V_S(POR) = 5 V), ESD resilience (±2 kV HBM), and fault detection for open-load and short-to-GND conditions.

Key Specifications

Pinout & Package

Package: PG-SSOP-14 with exposed thermal pad (EP), lead pitch 0.65 mm, body size 5.0 × 6.0 mm. Exposed pad must be soldered to PCB GND plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side LED current source applications.

Compared with AL8862SP-13 and TPS92692QPWPRQ1, the TLD1124ELXUMA1 offers superior integration (no external inductor/diode), built-in automotive-grade diagnostics, and best-in-class thermal performance (RthJA = 45 K/W) for linear high-side drivers - making it optimal for cost-sensitive, space-constrained rear lamp modules.

Availability

TLD1124ELXUMA1 is available at Aetrix Electronics and suitable for automotive rear combination lamps, dashboard ambient lighting, side marker lights, and CHMSL requiring stable component supply across extended temperature and voltage ranges.

Supply support for TLD1124ELXUMA1 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 qualification to AEC-Q100 Grade 1.

The LITIX™ Basic product line delivers robust, cost-optimized LED drivers for automotive exterior and interior lighting, emphasizing diagnostic coverage, thermal resilience, and seamless integration into existing lamp ECU architectures.

FAQ

What is the recommended decoupling capacitor value for the VS pin?

A ceramic capacitor of 100 nF to 1 µF must be placed between VS and GND, as close as possible to pins 1 and 2. This stabilizes the internal supply during load transients and suppresses high-frequency noise from the battery rail. X7R dielectric with 16 V rating is preferred for automotive temperature range compliance.

Can the TLD1124ELXUMA1 drive multiple parallel LED strings?

No - it is a single-channel device with one OUT pin and one current regulation loop. Driving parallel strings would cause current mismatch due to V_F variation, risking thermal runaway. For multi-string control, use one TLD1124ELXUMA1 per string or select a multi-channel alternative like TLD1125EL.

How does the DEN pin affect normal operation when disabled?

When DEN voltage falls below V_DEN(dis), all diagnostic functions (OL/SC detection, ST pin assertion) are disabled, but the output current regulation and thermal protection remain fully active. The device continues driving LEDs normally - only fault reporting is suppressed.

Is the exposed thermal pad electrically isolated?

No - the exposed pad (EP) is internally connected to GND and must be soldered to a PCB GND copper pour. It serves both thermal conduction (reducing RthJA by ~20 K/W) and electrical grounding. Floating or insulated mounting degrades thermal performance and violates functional safety requirements.