Linear LED driver with 16 constant-current outputs
The Texas Instruments TLC5925IDBQR is a linear LED driver IC designed for signage and display applications where consistent brightness across multiple LEDs matters. It integrates a 30 MHz shift register and 16 constant-current sink outputs, each rated for 45 mA, with the internal switch function built in so no external driver transistors are needed for the LED strings. The supply range of 3 V to 5.5 V lets it run off common logic rails, and the -40°C to 125°C operating temperature covers industrial and outdoor signage environments where thermal cycling is a given.
30 MHz shift register — what it means for update rate
The 30 MHz clock rate on the shift register determines how fast you can push new pattern data into the 16 outputs. For a 16-channel daisy-chain, a 30 MHz clock gives a theoretical update rate well above 1 MHz per channel, which is overkill for static signage but useful for multiplexed or PWM-modulated brightness control where you need to refresh faster than the eye can perceive flicker. The constant-current sinks hold the LED current steady regardless of supply ripple or LED forward voltage variation, so brightness uniformity across a panel is set by the 45 mA per-channel limit and the resistor tolerance, not by the LED binning.
Package and mounting for production
Housed in a 24-SSOP (0.154", 3.90 mm width) surface-mount package, the TLC5925IDBQR fits on standard PCB footprints for multiplexed LED matrices. The supplier device package is 24-SSOP, and it ships in Tape & Reel (TR) or Cut Tape (CT) options, which aligns with automated pick-and-place assembly for volume runs.
Lifecycle and sourcing reality
The TLC5925IDBQR carries an Active product status per the manufacturer, with ROHS3 compliance. No end-of-life notice or last-time-buy window has been issued.