Constant Current RGB LED Driver with I2C Interface
Constant Current RGB LED Driver with I2C Interface

The SGM31323 is a 3-channel, current-regulated RGB LED driver with an I2C-compatible interface. It is well suited for various applications powered by a 1-cell Li-Ion or Li-Polymer, or systems with 3.3V or 5V supply voltages, as well as 3-cell NiCd, NiMH or Alkaline batteries. No external components are required for the three constant current sinks.

With two programmable timers, users can adjust LED blinking time and get the result of fade-in and fade-out for unique color lighting.

Programmable I2C interface allows independent channel control for LED ON or OFF state and LED brightness due to 9 internal registers and an internal decoder. Each current sink can be independently configured with 192-step current levels from 0.125mA to 24mA. The SGM31323 provides less than 1μA shutdown current.

The SGM31323 is available in a Green UTDFN- 1.5×1.5-8L package. It operates over an ambient temperature range of -40 to +85.



  • Input Voltage Range: 2.5V to 5.5V

  • Ultra-Low 30mV Dropout Voltage at a 10mA Load per String

  • Programmable LED Current through I2C Interface

  • 0.125mA to 24mA Current Levels with 0.125mA Steps

  • Independent Channel Control

    ON/OFF State Interval Time Control

    RGB LED Color Control

    Programmable Ramp-Up and Ramp-Down Time

  • No Noise and Constant LED Current

  • Fast and Smooth Startup

  • Less than 1μA Shutdown Current

  • -40 to +85 Operating Temperature Range

  • Available in a Green UTDFN-1.5×1.5-8L Package


Multi-Color LEDs

RGB Indicator LEDs

Impact LED Signs and Displays

Handheld Equipment

Part Number Status Package Pins Pb-Free Temp Range
SGM31323YUDW8G/TR Production UTDFN-1.5×1.5-8L 8 Y -40℃ to +85℃ Samples
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