LTC3210-2

LTC3210-2/LTC3210-3 MAIN/CAM LED Controllers with 32-Step Brightness Control in 3mm × 3mm QFN Features Description n Low Noise Charge Pump Provides High Efficiency with Automatic Mode Switching n Multimode Operation: 1x, 1.5x, 2x n Individual Full-Scale Current Set Resistors n Up to 500mA Total Output Current n Single Wire EN/Brightness Control for MAIN and CAM LEDs n 32:1 Linear Brightness Control Range for MAIN Display n Three or Four 25mA Low Dropout MAIN LED Outputs n One 400mA Low Dropout CAM LED Output n Low Noise Constant Frequency Operation* n Low Shutdown Current: 3µA n Internal Soft-Start Limits Inrush Current During Startup and Mode Switching n Open/Short LED Protection n No Inductors n 3mm × 3mm 16-Lead Plastic QFN Package Applications n Multi-LED Light Supply for Cellphones/DSCs/PDAs L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 6411531. The LTC®3210-2/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 sm...