Features and Benefits
- Step-Up/Direct-Connect Fractional Charge Pump Provides Up to 92% Efficiency
- Up to 400mA Continuous Output Current
- Independent Current and Dimming Control for 1-6 LED MAIN, 1-4 LED SUB and RGB LED Displays
- LED Currents Programmable Using 2-Wire I2C™ Serial Interface
- 1% LED Current Matching
- Low Noise Constant Frequency Operation*
- Minimal Component Count
- Automatic Soft-Start Limits Inrush Current
- 16 Exponentially Spaced Dimming States Provides
128:1 Brightness Range for MAIN and SUB Displays
- Up to 4096 Color Combinations for RGB Display
- Low Operating Current: IVIN = 180µA
- Tiny, Low Profile 24-Lead (4mm × 4mm × 0.75mm) QFN Package
The LTC3206 is a highly integrated 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 achieved via a 2-wire serial interface. Two auxiliary LED pins can be individually assigned to either the MAIN or SUB displays. 16 individual dimming states exist for both the MAIN and SUB displays. Each of the RED, GREEN and BLUE LEDs have 16 dimming states as well, resulting in up to 4096 color combinations.
The LTC3206 charge pump optimizes efficiency based on VIN and LED forward voltage conditions. The part powers up in direct-connect mode and automatically switches to 1.5x step-up mode once any enabled LED current source begins to enter dropout. Internal circuitry prevents inrush current and excess input noise during start-up and mode switching. The LTC3206 is available in a 24-lead (4mm × 4mm) QFN package.
- Cellular Phones
- Wireless PDAs
- Multidisplay Handheld Devices
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.