Infineon Technologies TLD2326ELXUMA1

Overview

TLD2326ELXUMA1 from Infineon Technologies is a 3-channel high-side LED current source IC designed for automotive exterior and interior lighting. It delivers up to 120 mA per channel with ±7% current accuracy at RSET = 12 kΩ, operates from 5.5 V to 40 V supply, and integrates thermal protection, open-load/short-to-GND diagnosis, and PWM dimming via EN/VS pins - deployed in tail/brake light modules and RGB ambient lighting systems.

For engineers reviewing the TLD2326ELXUMA1 datasheet, TLD2326ELXUMA1 pinout, TLD2326ELXUMA1 application, or TLD2326ELXUMA1 equivalent, key selection criteria include channel count (3), high-side current sourcing capability (120 mA max), diagnostic coverage (OL/SC-GND), thermal derating behavior (RthJA = 43–61 K/W), and PG-SSOP-14 exposed-pad package compatibility with automotive PCB layouts.

Technical Context

The device implements three independent high-side current sources with dynamic overhead control to maintain stable output current across varying LED forward voltage and supply rail fluctuations. Each channel uses an external resistor (IN_SET1–3) to set nominal current, with support for PTC-based thermal foldback.

Integrated diagnostics include open-load detection on all outputs and short-to-GND detection, reported via FB pin behavior. Protection functions - undervoltage lockout (5 V POR threshold), reverse polarity, overtemperature shutdown, and ESD hardening (±2 kV HBM) - are active during fault conditions but not intended for continuous cycling.

Key Specifications

Pinout & Package

Package: PG-SSOP-14 with exposed thermal pad (EP), lead-free and RoHS-compliant, optimized for automotive thermal management on 2-layer or 4-layer PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL8863-7DT-13 and TPS92692QPWPRQ1, TLD2326ELXUMA1 offers optimal balance of integrated diagnostics, ultra-low sleep current (0.1 µA), and automotive-qualified thermal robustness in a compact 14-pin SSOP - ideal for cost-sensitive, safety-aware exterior lighting where pin count and footprint are constrained.

Availability

TLD2326ELXUMA1 is available at Aetrix Electronics and suitable for rear lighting modules, dashboard ambient lighting, side marker systems, and interior dome light control requiring stable component supply across automotive production lifecycles.

Supply support for TLD2326ELXUMA1 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 qualification aligned to AEC-Q100 standards.

TLD2326ELXUMA1 belongs to the LITIX™Basic family - engineered specifically for cost-optimized, high-reliability LED lighting in automotive body electronics, emphasizing integrated protection, minimal external components, and thermal resilience.

FAQ

What is the maximum allowable thermal resistance (RthJA) to sustain 120 mA per channel continuously?

At 120 mA per channel (360 mA total), power dissipation reaches ~1.5 W. With Tj(max) = 150°C and ambient Ta = 85°C, RthJA must be ≤43 K/W - achievable only on a 2s2p FR4 board with thermal vias under the exposed pad. On 1s0p boards (RthJA = 61 K/W), continuous 120 mA operation exceeds thermal limits and requires derating to 60 mA/channel.

Can the FB pin be used for real-time current monitoring, or is it diagnostic-only?

The FB pin is strictly diagnostic-only: it outputs an open-drain signal indicating OL or SC-GND faults, with no analog current feedback capability. Real-time current monitoring requires measuring voltage across the external RSET resistors. The FB pin does not provide proportional current information - its function is binary fault flagging per channel group.

Does the EN pin support hardware PWM dimming at frequencies above 1 kHz?

Yes - the EN pin supports clean PWM dimming up to 2 kHz without current overshoot or instability, verified per datasheet Figure 4. At 2 kHz, tPOR (power-on reset time) is negligible relative to period, and output current settles within 10 µs after enable assertion. No external filtering or slew-rate limiting is required for automotive-grade dimming performance.

How does reverse polarity protection operate, and what is the maximum tolerable reverse voltage?

Reverse polarity protection is implemented via internal back-to-back MOSFETs that block current flow when VS is negative relative to GND. The device withstands −16 V continuously (per Absolute Maximum Ratings Table 4.1.1), with no latch-up or damage. During reverse bias, all outputs remain disabled and quiescent current stays below 1 µA - meeting ISO 16750-2 requirements for automotive battery reversal testing.