Infineon Technologies TLD5045EJXUMA1

Overview

TLD5045EJXUMA1 from Infineon is a highly integrated automotive-grade DC/DC step-down LED controller with built-in NPN power switch, freewheeling diode, current sense resistor, and status pull-down transistor. It delivers constant output current up to 700 mA across 5–40 V input, operates at typ. 200 kHz switching frequency (adjustable via external RC), and features integrated PWM dimming engine and open-load diagnosis. Used in brake/tail/CHMSL lighting modules.

For engineers reviewing the TLD5045EJXUMA1 datasheet, TLD5045EJXUMA1 pinout, TLD5045EJXUMA1 application, or TLD5045EJXUMA1 equivalent, key selection considerations include peak current regulation accuracy (±5% over temp), sleep-mode current (<2 µA), AEC-Q100 qualification, thermal shutdown threshold (165 °C), and compatibility with decentralized light module architectures without microcontroller intervention.

Technical Context

The TLD5045EJXUMA1 implements fixed OFF-time control with VREC feedforward to stabilize switching frequency across input voltage variations. Peak current is set per cycle by an external resistor on the SET pin, while FREQ pin adjusts t_OFF via RC network - enabling precise current regulation independent of inductor tolerance or temperature drift.

It integrates open-load detection via internal current monitoring and status reporting through open-drain ST pin, plus UV/OV lockout with hysteresis and overtemperature protection that disables switching above 165 °C. The device supports both analog dimming (via SET resistor) and dual-mode PWM dimming: internal (RC-based auto-dimming) or external (µC-driven PWMI).

Key Specifications

Pinout & Package

Package: PG-DSO-8 EP - thermally enhanced SOIC-8 with exposed pad (EP) soldered to inner GND plane for efficient heat dissipation in high-power LED drivers.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED buck controller applications.

Compared with NCV8843 and BD8374EFV-M, the TLD5045EJXUMA1 uniquely combines integrated power switch, freewheeling diode, current sense, open-load diagnosis, and autonomous PWM dimming - delivering lowest component count and highest functional integration for AEC-Q100-compliant automotive LED lighting.

Availability

TLD5045EJXUMA1 is available at Aetrix Electronics and suitable for brake lights, tail lights, and daytime running lights requiring stable component supply, AEC-Q100 qualification, and long-term automotive lifecycle support.

Supply support for TLD5045EJXUMA1 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 AG is a German semiconductor manufacturer specializing in power management, automotive electronics, and industrial control ICs, with global manufacturing and quality certification aligned to IATF 16949.

The LITIX™ Power family targets automotive LED lighting systems, emphasizing high integration, diagnostic capability, and robustness for exterior and interior lighting applications under harsh environmental conditions.

FAQ

What is the maximum continuous output current supported by the TLD5045EJXUMA1?

The TLD5045EJXUMA1 supports a maximum regulated output current of 700 mA, achieved by setting the peak switch current via the external resistor on the SET pin (I_PEAK = 1.25 V / R_SET). This current remains stable across input voltages from 5 V to 40 V and junction temperatures from −40 °C to +150 °C, with ±5% tolerance over full operating range.

How does the internal PWM dimming function work without a microcontroller?

The internal PWM dimming engine uses an RC network connected between PWMI and GND to generate autonomous dimming waveforms. The resistor and capacitor values determine both frequency and duty cycle - for example, 100 kΩ + 10 nF yields ~200 Hz at 50% duty. No µC or external clock source is needed, making it ideal for decentralized light modules with minimal external components.

Can the TLD5045EJXUMA1 be used in non-automotive applications?

While qualified to AEC-Q100 Grade 1 and optimized for automotive lighting, the TLD5045EJXUMA1 can operate in industrial or commercial constant-current LED applications within its electrical and thermal limits (5–40 V input, −40 °C to +150 °C T_J). However, its diagnostic features (ST pin, open-load detection) and thermal protection thresholds are calibrated for automotive use cases and may require validation for non-automotive safety requirements.

What thermal design guidance applies to the PG-DSO-8 EP package?

The exposed pad (EP) must be soldered to a minimum 100 mm² copper area on an inner GND layer, connected via ≥6 thermal vias (0.3 mm diameter) to maximize heat transfer. With this layout, R_thJA is reduced to ≤50 K/W, enabling full 700 mA output at 125 °C ambient. Thermal simulation or IR imaging is recommended to verify hotspot temperature stays below 165 °C under worst-case load and airflow conditions.