1 Features
1• Three Constant Sink Current Channels
• Current Capability:
– 2 mA to 35 mA per Channel (VCC ≤ 4.0 V)
– 2 mA to 50 mA per Channel (VCC > 4.0 V)
• Grayscale (GS) Control with PWM:
– 12-Bit (4096 Steps)
• Single-Wire Interface (EasySet)
• Power-Supply (VCC) Voltage Range:
– 3 V to 6 V
• OUT Pins Maximum Voltage: Up to 21 V
• Integrated Shunt Regulator
• Data Transfer Maximum Rate:
– Bits per Second (bps): 3 Mbps
• Internal GS Clock Oscillator: 12 MHz (typ)
• Display Repeat Rate: 2.9 kHz (typ)
• Output Delay Switching to Prevent Inrush Current
• Unlimited Device Cascading
• Operating Temperature: –40°C to 85°C

2 Applications
This device is targeted towards one application.
The primary application for this device is for RGB
LED cluster lamp displays.

3 Description
The TLC5973 is an easy-to-use, 3-channel, 50-mA
constant sink current LED driver. The single-wire,
3-Mbps serial interface (EasySet) provides a solution
for minimizing wiring cost. The LED driver provides
12-bit pulse width modulation (PWM) resolution. The
display repeat rate is achieved at 2.9 kHz (typ) with
an integrated 12-MHz grayscale (GS) clock oscillator.
The driver also provides unlimited cascading
capability.
All output sink constant currents can be set by an
external resistor. The TLC5973 has an internal shunt
regulator that can be used for higher VCC powersupply
voltage applications.