Texas Instruments TLC59282DBQ

Overview

TLC59282DBQ from Texas Instruments is a 16-channel constant-current LED sink driver in SSOP-24 package, supporting up to 45 mA per channel at VCC ≥ 3.6 V, with 4-channel grouped delay for EMI reduction and CMOS-compatible serial interface (SIN/SCLK/LAT/BLANK). It operates from 3 V to 5.5 V and drives LEDs in video displays, message boards, and architectural illumination systems.

For engineers reviewing the TLC59282DBQ datasheet, TLC59282DBQ pinout, TLC59282DBQ application, or TLC59282DBQ equivalent, key selection criteria include channel-to-channel current matching (±0.6% typ), BLANK pulse width (30 ns min), 35 MHz data clock support, and IREF resistor-based current programming - all critical for high-fidelity LED matrix timing and thermal stability.

Technical Context

The TLC59282DBQ implements a 16-bit shift register cascaded to a 16-bit output latch, with Schmitt-triggered digital inputs enabling robust noise immunity across 3.3 V or 5 V logic domains. Data transfer occurs on SCLK rising edges, and LAT enables synchronous latching of all 16 bits to outputs.

Its four-grouped delay architecture staggers turn-on/off transitions across OUT0–OUT15 in four fixed groups (e.g., OUT0/7/8/15 first, then OUT1/6/9/14), reducing peak surge current by sequencing sink activation with ~20 ns inter-group delays - directly mitigating conducted EMI without external timing components.

Key Specifications

Pinout & Package

Package: SSOP-24 (DBQ), 0.154-inch body width, 0.635 mm pitch, exposed thermal pad (not internally connected to GND; requires PCB-level GND tie).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC59283DBQ, the TLC59282DBQ lacks thermal shutdown but matches its timing, current programming, and grouping behavior - making it ideal for thermally managed systems. Versus MAX7219CWG+, TLC59282DBQ provides double the channel count, higher current capability, and EMI-reducing grouped delay, at the cost of requiring external microcontroller bit-banging.

Availability

TLC59282DBQ is available at Aetrix Electronics and suitable for video displays, message boards, and architectural lighting applications requiring stable component supply, long-term industrial availability, and RoHS-compliant packaging.

Supply support for TLC59282DBQ 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 specializing in analog, embedded processing, and connectivity technologies, with decades of experience in precision power and signal-chain solutions.

The TLC59282DBQ belongs to TI's LED driver product line, engineered specifically for high-channel-count, constant-current LED control in commercial signage and industrial visualization systems - emphasizing timing fidelity, current matching, and EMI resilience.

FAQ

What is the maximum LED string voltage supported by the TLC59282DBQ?

The TLC59282DBQ supports an output voltage range up to 17 V across OUT0–OUT15. This allows driving series-connected LED strings with combined forward voltages up to 16 V while maintaining regulation, provided the VCC rail remains within 3–5.5 V and thermal limits are observed. The 17 V rating is absolute maximum; design margin should be applied per application conditions.

How does the four-grouped delay feature reduce EMI in the TLC59282DBQ?

The TLC59282DBQ sequences output switching across four fixed groups (e.g., OUT0/7/8/15 first, then OUT1/6/9/14) with ~20 ns inter-group delays. This staggers di/dt events, cutting peak surge current by up to 75% compared to simultaneous switching - directly lowering conducted EMI without external filters or layout changes. The delay is hardwired and requires no configuration.

Can the TLC59282DBQ be daisy-chained with other TLC59282DBQ devices?

Yes, the TLC59282DBQ supports daisy-chaining via SIN and SOUT pins: SOUT of one device connects to SIN of the next. Each device shifts in 16 bits, allowing N devices to control 16×N LEDs using a single serial bus. Latency increases linearly with chain length, but BLANK and LAT remain shared across all devices for synchronized updates.

What is the role of the IREF pin on the TLC59282DBQ, and how is current set?

The IREF pin on the TLC59282DBQ connects to an external resistor (RIREF) tied to GND, setting the sink current for all 16 channels. Current is calculated as IOUT ≈ 41.9 × (VIREF / RIREF), where VIREF = 1.205 V (typ). For example, RIREF = 1.44 kΩ yields ~35 mA per channel at VCC ≥ 3.6 V. Values must stay within 2–45 mA range per datasheet limits.

Is the thermal pad on the TLC59282DBQ package electrically connected internally?

No, the thermal pad on the TLC59282DBQ (SSOP-24) package is not connected to any internal node. It must be externally connected to PCB GND via copper pour or vias to ensure proper thermal dissipation. Failure to connect the pad degrades θJA performance (73.2°C/W nominal) and risks thermal shutdown or parametric drift under sustained load.