This datasheet introduces the LTC3206 I2C multidisplay LED controller. The part contains a high efficiency, low noise fractional step-up/direct-connect charge pump to provide power for both main and sub white LED displays plus an RGB color LED display. The LTC3206 requires only four small ceramic capacitors plus two resistors to form a complete 3-display LED power supply and current controller. Maximum currents for the main/sub displays and RGB display are set independently. Current for each LED is controlled with an internal current source. Dimming and ON/OFF control for all displays is provided by an internal logic controller.
The LTC3206 LED controller provides a step‑up/direct‑connect fractional charge pump delivering up to 92% efficiency and up to 400 mA continuous output current. It supports independent current and dimming control for 1‑6 main LEDs, 1‑4 sub LEDs and RGB displays, with 16 dimming states per channel and up to 4096 color combinations.
The device is packaged in a 24‑lead (4 mm × 4 mm) plastic QFN and operates from 2.7 V to 6 V input voltage. It communicates via a standard 2‑wire I²C serial interface (up to 400 kHz) and includes detailed pin functions, electrical characteristics, and typical application circuits for multidisplay handheld devices.
| Continuous Output Current | up to 400 mA |
|---|---|
| Efficiency | up to 92 % |
| Package | 24‑Lead Plastic QFN (4 mm × 4 mm) |
| LED Brightness Range | 0.78 % to 100 % |
| I²C Bus Speed | up to 400 kHz |
| 1x Mode Output Impedance | 0.68 Ω |
| 1.5x Mode Output Impedance | 1.90 Ω |
The LTC3206 can supply up to 400 mA continuous output current.
Each of the main and sub displays has 16 exponentially spaced dimming states, giving a 128:1 brightness range.
It uses a standard 2‑wire I²C serial interface for control.