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LTC3210-2/LTC3210-3 - MAIN/CAM LED Controllers with 32-Step Brightness Control in 3mm × 3mm QFN

The LTC3210-2/LTC3210-3 are low noise charge pump DC/DC converters designed to drive three or four MAIN LEDs and one high current CAM LED for camera lighting. The LTC3210-2/LTC3210-3 require only four small ceramic capacitors and two current set resistors to form a complete LED power supply and current controller.

Built-in soft-start circuitry prevents excessive inrush current during start-up and mode changes. High switching frequency enables the use of small external capacitors. Independent MAIN and CAM full-scale current settings are programmed by two external resistors.

Shutdown mode and current output levels are selected via two logic inputs. ENM and ENC are toggled to adjust the LED currents via internal counters and DACs. A 5-bit linear DAC (32 steps) provides high resolution brightness control for the MAIN display.

The charge pump optimizes efficiency based on the voltage across the LED current sources. The part powers up in 1x mode and will automatically switch to boost mode whenever any enabled LED current source begins to enter dropout. The LTC3210-2/LTC3210-3 are available in a 3mm × 3mm 16-lead QFN package.

Features Low Noise Charge Pump Provides High Efficiency with Automatic Mode Switching Multimode Operation: 1x, 1.5x, 2x Individual Full-Scale Current Set Resistors Up to 500mA Total Output Current Single Wire EN/Brightness Control for MAIN and CAM LEDs 32:1 Linear Brightness Control Range for MAIN Display Three or Four 25mA Low Dropout MAIN LED Outputs One 400mA Low Dropout CAM LED Output Low Noise Constant Frequency Operation* Low Shutdown Current: 3μA Internal Soft-Start Limits Inrush Current During Startup and Mode Switching Open/Short LED Protection No Inductors 3mm × 3mm 16-Lead Plastic QFN Package Typical Application

Applications Multi-LED Light Supply for Cellphones/DSCs/PDAs Packaging

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