Infineon Technologies TLD21421EPXUMA1

Overview

TLD21421EPXUMA1 from Infineon Technologies is a single-channel automotive-grade high-side LED driver IC with integrated protected current source output stage, designed for precise 180 mA nominal (240 mA max) LED current control in 8–18 V automotive supply systems; features reverse polarity protection, intelligent shared error network support (up to 16 devices), and external resistor-based current setting.

For engineers reviewing the TLD21421EPXUMA1 datasheet, TLD21421EPXUMA1 pinout, TLD21421EPXUMA1 application, or TLD21421EPXUMA1 equivalent, this page delivers verified technical context, validated pin functions, real-world automotive lighting use cases, and confirmed alternative drivers with documented functional differences.

Technical Context

The TLD21421EPXUMA1 implements a high-side current source architecture with internal thermal shutdown, reverse battery protection, and open-load/short-to-GND diagnosis. Its IN_SET pin accepts either a precision resistor or a reference voltage from another LITIX™ Basic+ device to set output current independently of supply and load variations.

Fault management operates via an open-drain ERRN pin and configurable D-pin timing (capacitor delay or direct GND tie), enabling scalable daisy-chained diagnostics across up to 16 devices using only one external pull-up resistor. PWM dimming is supported via direct PWMI input or internal engine controlled by PWM_RST/PWM_SET resistors.

Key Specifications

Pinout & Package

Package: PG-TSDSO-14 (exposed pad), thermally enhanced 14-pin thin shrink small outline package with GND-connected EP for efficient heat dissipation in high-current LED driver applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ASL3416SHUML and TLD20311EPXUMA1, the TLD21421EPXUMA1 uniquely balances integrated protection, current reference sharing (OUT_SET), and ultra-low sleep current-making it optimal for distributed, fault-tolerant automotive lighting nodes requiring minimal external components.

Availability

TLD21421EPXUMA1 is available at Aetrix Electronics and suitable for automotive stop/tail lighting, turn signal indicators, and daytime running lights requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.

Supply support for TLD21421EPXUMA1 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 sensor solutions, with global manufacturing and automotive qualification infrastructure.

The LITIX™ Basic+ product line delivers robust, AEC-Q100-qualified LED drivers optimized for cost-sensitive yet safety-critical automotive exterior and interior lighting functions.

FAQ

What is the maximum allowable thermal resistance (RthJA) to sustain 240 mA continuous output?

The datasheet specifies 240 mA as the absolute maximum output current, achievable only when the PCB layout achieves RthJA ≤ 45 K/W. At higher RthJA values, thermal foldback reduces current to maintain TJ ≤ 150°C. For reliable 240 mA operation, use 2 oz copper, thermal vias under the exposed pad, and minimize trace length between VS and OUT.

Can the TLD21421EPXUMA1 drive LEDs directly from a 42 V supply?

No. While the absolute maximum VS rating is 40 V, the functional operating range is 5.5–18 V for nominal performance. Operation above 18 V falls into extended range (up to 40 V), where parameters like current accuracy and thermal behavior are not guaranteed. It is not rated for 42 V (e.g., 36 V battery systems).

How does the D-pin configuration affect open-load detection timing?

When a capacitor is connected between D and GND, open-load detection is delayed by RC time constant (e.g., 100 nF + 100 kΩ = ~10 ms delay). With D tied directly to GND, detection occurs within 100 µs. Leaving D open disables load diagnosis entirely - only short-to-GND and thermal faults remain active.

Is the ERRN pin compatible with 3.3 V microcontroller inputs?

Yes. ERRN is an open-drain output with 40 V absolute max rating and typical leakage <1 µA. A standard 10 kΩ pull-up to 3.3 V yields valid logic-low (<0.4 V) and logic-high (>3.0 V) levels for direct interfacing with 3.3 V MCUs without level-shifting.