TLC5973DR

Overview

The TLC5973DR is a 3-channel, 12-bit PWM constant-current LED driver manufactured by Texas Instruments. It operates within a supply voltage range of 3 V to 6 V and delivers up to 50 mA per channel when VCC exceeds 4.0 V. The device utilizes a boost topology with an internal shunt regulator and supports a maximum output voltage of 21 V. It features a single-wire interface for data transmission and includes an internal grayscale clock. The component functions at a working frequency of 3 MHz and is housed in an SOIC-8 package, suitable for surface-mount installation across a temperature range of -40°C to +125°C.

Feature Summary

• Integrates three independent channels for precise constant-current LED control
• Utilizes a single-wire interface to minimize pin count and simplify system design
• Includes internal grayscale clock generation for accurate PWM dimming
• Features an integrated boost converter and shunt regulator for stable operation

Applications

• LED lighting driver circuits requiring multi-channel control
• Portable electronic devices with limited I/O pins
• Backlighting systems for displays and indicators
• General-purpose LED illumination modules

Procurement Notes

Verify the specific ordering suffix matches the required tape-and-reel quantity, as standard packaging may vary by distributor. Confirm that the SOIC-8 footprint aligns with the target PCB layout dimensions. Ensure the input voltage supply remains within the specified 3 V to 6 V range to prevent device malfunction. Check for RoHS compliance documentation if environmental regulations apply to the final assembly. Validate thermal management requirements given the operating temperature limits.

Selection Notes

Select this component when a low-pin-count solution for multi-channel LED driving is required. The single-wire interface reduces complexity compared to parallel data lines. Consider the 50 mA output capability for standard indicator or small array applications. The integrated boost topology eliminates external inductor requirements for certain configurations. Evaluate the 12-bit resolution against required brightness uniformity needs.

Part Context

This part belongs to the TLC5973 series of LED drivers from Texas Instruments. It is designed as a linear shift register-based controller for managing multiple LEDs efficiently. The DR suffix indicates the SOIC-8 surface-mount package variant. It serves as a specialized IC for applications prioritizing simplicity and reduced component count in LED control architectures.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.