Texas Instruments TLC6C5748QDCARQ1

Overview

TLC6C5748QDCARQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified 48-channel constant-current LED sink driver with 16-bit grayscale PWM (65,536 steps), 7-bit dot correction (128 steps), and 3-bit maximum current control (8 steps). It delivers up to 31.9 mA per channel at VCC > 3.6 V and supports LED power supply up to 10 V. It is used in high-fidelity RGB display backlighting for automotive center stacks and digital instrument clusters.

For engineers reviewing the TLC6C5748QDCARQ1 datasheet, TLC6C5748QDCARQ1 pinout, TLC6C5748QDCARQ1 application, or TLC6C5748QDCARQ1 equivalent, key selection criteria include channel-to-channel current accuracy (±2% typ), integrated LOD/LSD fault detection, GSCLK timing at 33 MHz, and HTSSOP-56 thermal pad layout requirements.

Technical Context

The TLC6C5748QDCARQ1 implements a hierarchical current control architecture: 3-bit MC sets per-color-group maximum sink current (3–30 mA range), 7-bit DC adjusts individual channel current (26.2–100% of MC), and 7-bit BC scales all channels within R/G/B groups (10–100%). Grayscale timing uses a dedicated 33 MHz GSCLK input to drive 16-bit PWM counters with display timing reset capability.

It integrates three error-detection mechanisms-LED open detection (LOD) with 0.28–0.35 V threshold, LED short detection (LSD) with programmable voltage thresholds (0.65×–0.95×VCC), and thermal shutdown (155–172°C)-all readable via serial status output SOUT after LAT falling edge. UVLO resets internal registers to safe defaults.

Key Specifications

Pinout & Package

Package: HTSSOP-56 (14.0 mm × 6.1 mm) with exposed thermal pad (soldered to PCB GND for thermal management).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC6C5912QDCARQ1 and TPS65632AQRGERQ1, the TLC6C5748QDCARQ1 uniquely combines 48-channel density, 16-bit grayscale, per-channel dot correction, and automotive-grade fault detection-making it irreplaceable for high-end RGB display backlighting where luminance uniformity and functional safety are critical.

Availability

TLC6C5748QDCARQ1 is available at Aetrix Electronics and suitable for automotive center stack displays, digital instrument clusters, and head-up displays requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLC6C5748QDCARQ1 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

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and automotive ICs with deep expertise in power management and signal chain solutions.

The TLC6C5748QDCARQ1 belongs to TI's automotive LED driver portfolio, engineered specifically for high-reliability RGB display backlighting in safety-critical vehicle interfaces-emphasizing luminance uniformity, fault resilience, and AEC-Q100 compliance.

FAQ

What is the maximum LED supply voltage supported by the TLC6C5748QDCARQ1?

The TLC6C5748QDCARQ1 supports LED power-supply voltage up to 10 V on its OUTXn pins. This allows direct connection to common automotive LED strings without intermediate voltage translation, provided the sink voltage headroom (VOUTfix ≈ 0.25 V) is maintained. The device's 0.25-V typical saturation voltage minimizes power loss and thermal stress at high currents.

How does the TLC6C5748QDCARQ1 achieve channel-to-channel current matching of ±2%?

The TLC6C5748QDCARQ1 achieves ±2% typical channel-to-channel current matching through matched internal current reference circuitry and precision layout of the 48 sink transistors within a single die. This matching is specified at VOUT = 0.8 V, MC = 4, and TA = +25°C, and is validated across the full –40°C to +125°C operating range per AEC-Q100 test conditions.

Can the TLC6C5748QDCARQ1 detect both open and short circuits on its LED outputs?

Yes, the TLC6C5748QDCARQ1 integrates both LED open detection (LOD) with a 0.28–0.35 V threshold and LED short detection (LSD) with two programmable thresholds (0.65×–0.75×VCC for LSDVLT = 0; 0.85×–0.95×VCC for LSDVLT = 1). Both fault flags are readable via SOUT after LAT falling edge, enabling real-time diagnostics without external components.

What is the role of the thermal pad on the HTSSOP-56 package of the TLC6C5748QDCARQ1?

The exposed thermal pad on the TLC6C5748QDCARQ1's HTSSOP-56 package is not internally connected to GND but must be externally soldered to a PCB GND plane. This provides a low-thermal-resistance path (RθJB = 16.1°C/W) to dissipate heat from the 48-channel sink array, ensuring reliable operation at 125°C ambient and preventing thermal shutdown during sustained high-current operation.

Does the TLC6C5748QDCARQ1 require external resistors to set output current?

No, the TLC6C5748QDCARQ1 eliminates external current-setting resistors by using internal register-controlled maximum current (MC) programming across three 3-bit fields-one per R/G/B color group. This removes resistor tolerance drift, reduces BOM count, improves long-term stability, and simplifies layout-while maintaining full 3–30 mA per-channel adjustability.