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3-channel, 12-bit PWM constant current LED driver

TLC5973DR General Description

One of the key features of the TLC5973DR is the ability to set all output sink constant currents using an external resistor, providing flexibility for different LED configurations. Furthermore, the driver includes an internal shunt regulator that supports higher VCC power-supply voltage applications, making it suitable for a wide range of LED projects. Whether you are working on a small-scale display or a larger installation, the TLC5973DR offers the performance and reliability needed to bring your LED designs to life

Key Features

  • 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


Number of channels 3 LED current per channel (mA) 50
LED configuration Series, Single Program memory No
Topology Current Sink, Linear Programmable ramp control No
Vin (min) (V) 3 Vin (max) (V) 5.5
Iout (max) (A) 0.15 Features Serial interface
Iq (typ) (mA) 5 Operating temperature range (°C) -40 to 125
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