Texas Instruments TLC59283DBQR

Overview

TLC59283DBQR from Texas Instruments is a 16-channel constant-current LED sink driver with pre-charge FET, CMOS-level serial interface (SIN/SCLK/LAT/BLANK), and single-resistor current setting. It delivers up to 45mA per channel at VCC > 3.6V, supports LED supply up to 10V, and operates from –40°C to +85°C. It is used in high-density multiplexed LED video displays to suppress ghosting and reduce EMI via grouped switching.

For engineers reviewing the TLC59283DBQR datasheet, TLC59283DBQR pinout, TLC59283DBQR application, or TLC59283DBQR equivalent, key selection criteria include channel-to-channel current matching (±3% max), 35MHz data rate, 50ns BLANK pulse width, pre-charge FET functionality, and QSOP-24 package compatibility with daisy-chain topology.

Technical Context

The TLC59283DBQR implements a 16-bit shift register cascaded to a parallel output latch, controlled by LAT for synchronous data transfer. Its constant-current sink outputs are set by a single external resistor connected to IREF, enabling precise per-device current calibration across all 16 channels.

Each OUTn features an integrated pre-charge FET activated during BLANK high to discharge parasitic capacitance and eliminate ghosting in dynamic LED matrix scanning. Outputs are grouped into nine staggered turn-on/turn-off sequences with ~2ns inter-group delay to minimize simultaneous switching noise and supply rail disturbance.

Key Specifications

Pinout & Package

Package: QSOP-24 (DBQ), 3.9mm × 8.65mm, 0.635mm pitch, exposed thermal pad (RGE variant only; DBQ has no thermal pad). Pin 1 = SIN, pin 24 = VCC, pin 12 = OUT10, pin 13 = OUT11, pin 17 = OUT14, pin 20 = OUT15.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC59283DBQR, TLC5940RTJR offers superior grayscale fidelity but adds design complexity and lacks hardware ghosting reduction, while MAX7219CWG+ trades channel count and pre-charge capability for lower integration cost and simpler SPI command structure.

Availability

TLC59283DBQR is available at Aetrix Electronics and suitable for video displays, outdoor message boards, and industrial HMI applications requiring stable component supply, long-lifecycle availability, and guaranteed traceable sourcing.

Supply support for TLC59283DBQR 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 power management technologies, with decades of experience in LED driver innovation.

The TLC59283 product line was designed specifically for high-reliability, high-density multiplexed LED display systems where ghosting suppression, EMI reduction, and precise current matching are critical system requirements.

FAQ

What is the maximum LED supply voltage supported by the TLC59283DBQR?

The TLC59283DBQR supports an LED supply voltage (VLED) up to 10V, allowing direct connection to common LED bus rails without external voltage translation. This rating is independent of VCC and applies to all 16 OUTn pins simultaneously, enabling flexible panel design with mixed LED forward voltage configurations. The absolute maximum output voltage rating is +11V, providing 1V margin for transient spikes.

How does the pre-charge FET in the TLC59283DBQR reduce ghosting in multiplexed LED displays?

The TLC59283DBQR's pre-charge FET actively pulls each OUTn node to VCC during BLANK high, discharging parasitic capacitance before the next row activates. This prevents residual charge from flowing through adjacent LEDs during common-line switching - the primary cause of ghosting. Unlike passive discharge methods, this active mechanism ensures consistent suppression across temperature and voltage variations, directly validated in TI's SLVAFP4 application note.

Can multiple TLC59283DBQR devices be daisy-chained, and what is required for proper cascading?

Yes, the TLC59283DBQR supports daisy-chaining via its SOUT pin, which outputs the MSB of the internal 16-bit shift register. To cascade, connect SOUT of Device 1 to SIN of Device 2, share SCLK/LAT/BLANK across all devices, and drive LAT after loading all shift registers. Each device requires its own IREF resistor, and propagation delay (tD0 ≤ 20ns) ensures reliable timing across chains of up to 16+ devices at 35MHz.

What is the role of the IREF pin, and how is output current calculated for the TLC59283DBQR?

The IREF pin hosts an internal 1.208V reference voltage. Connecting an external resistor (RIREF) between IREF and GND sets the sink current for all 16 channels using IOUT = 43.8 × (1.208V / RIREF). For example, a 1.51kΩ resistor yields 35mA at VCC ≤ 3.6V. The TLC59283DBQR's current accuracy remains within ±3% channel-to-channel and ±4% device-to-device across temperature and supply voltage, verified per TI SBVS199C test conditions.

Does the TLC59283DBQR require external pull-up or pull-down resistors on its control pins?

No external biasing is required: the TLC59283DBQR integrates internal 500kΩ pull-up on BLANK and 500kΩ pull-down on LAT, ensuring defined logic states at power-up. SIN and SCLK have no internal terminations but accept standard CMOS logic levels (VIH ≥ 0.7×VCC, VIL ≤ 0.3×VCC) and exhibit <1μA input leakage, making them compatible with most microcontrollers without external resistors.